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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/s390/kvm/kvm-s390.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
-rw-r--r--arch/s390/kvm/kvm-s390.c5700
1 files changed, 5700 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
new file mode 100644
index 000000000..377536347
--- /dev/null
+++ b/arch/s390/kvm/kvm-s390.c
@@ -0,0 +1,5700 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * hosting IBM Z kernel virtual machines (s390x)
+ *
+ * Copyright IBM Corp. 2008, 2020
+ *
+ * Author(s): Carsten Otte <cotte@de.ibm.com>
+ * Christian Borntraeger <borntraeger@de.ibm.com>
+ * Christian Ehrhardt <ehrhardt@de.ibm.com>
+ * Jason J. Herne <jjherne@us.ibm.com>
+ */
+
+#define KMSG_COMPONENT "kvm-s390"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/compiler.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/hrtimer.h>
+#include <linux/init.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/mman.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/vmalloc.h>
+#include <linux/bitmap.h>
+#include <linux/sched/signal.h>
+#include <linux/string.h>
+#include <linux/pgtable.h>
+#include <linux/mmu_notifier.h>
+
+#include <asm/asm-offsets.h>
+#include <asm/lowcore.h>
+#include <asm/stp.h>
+#include <asm/gmap.h>
+#include <asm/nmi.h>
+#include <asm/switch_to.h>
+#include <asm/isc.h>
+#include <asm/sclp.h>
+#include <asm/cpacf.h>
+#include <asm/timex.h>
+#include <asm/ap.h>
+#include <asm/uv.h>
+#include <asm/fpu/api.h>
+#include "kvm-s390.h"
+#include "gaccess.h"
+#include "pci.h"
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+#include "trace-s390.h"
+
+#define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */
+#define LOCAL_IRQS 32
+#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
+ (KVM_MAX_VCPUS + LOCAL_IRQS))
+
+const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+ STATS_DESC_COUNTER(VM, inject_io),
+ STATS_DESC_COUNTER(VM, inject_float_mchk),
+ STATS_DESC_COUNTER(VM, inject_pfault_done),
+ STATS_DESC_COUNTER(VM, inject_service_signal),
+ STATS_DESC_COUNTER(VM, inject_virtio),
+ STATS_DESC_COUNTER(VM, aen_forward)
+};
+
+const struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_SIZE,
+ .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
+ .id_offset = sizeof(struct kvm_stats_header),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+ sizeof(kvm_vm_stats_desc),
+};
+
+const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+ KVM_GENERIC_VCPU_STATS(),
+ STATS_DESC_COUNTER(VCPU, exit_userspace),
+ STATS_DESC_COUNTER(VCPU, exit_null),
+ STATS_DESC_COUNTER(VCPU, exit_external_request),
+ STATS_DESC_COUNTER(VCPU, exit_io_request),
+ STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
+ STATS_DESC_COUNTER(VCPU, exit_stop_request),
+ STATS_DESC_COUNTER(VCPU, exit_validity),
+ STATS_DESC_COUNTER(VCPU, exit_instruction),
+ STATS_DESC_COUNTER(VCPU, exit_pei),
+ STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
+ STATS_DESC_COUNTER(VCPU, instruction_lctl),
+ STATS_DESC_COUNTER(VCPU, instruction_lctlg),
+ STATS_DESC_COUNTER(VCPU, instruction_stctl),
+ STATS_DESC_COUNTER(VCPU, instruction_stctg),
+ STATS_DESC_COUNTER(VCPU, exit_program_interruption),
+ STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
+ STATS_DESC_COUNTER(VCPU, exit_operation_exception),
+ STATS_DESC_COUNTER(VCPU, deliver_ckc),
+ STATS_DESC_COUNTER(VCPU, deliver_cputm),
+ STATS_DESC_COUNTER(VCPU, deliver_external_call),
+ STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
+ STATS_DESC_COUNTER(VCPU, deliver_service_signal),
+ STATS_DESC_COUNTER(VCPU, deliver_virtio),
+ STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
+ STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
+ STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
+ STATS_DESC_COUNTER(VCPU, deliver_program),
+ STATS_DESC_COUNTER(VCPU, deliver_io),
+ STATS_DESC_COUNTER(VCPU, deliver_machine_check),
+ STATS_DESC_COUNTER(VCPU, exit_wait_state),
+ STATS_DESC_COUNTER(VCPU, inject_ckc),
+ STATS_DESC_COUNTER(VCPU, inject_cputm),
+ STATS_DESC_COUNTER(VCPU, inject_external_call),
+ STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
+ STATS_DESC_COUNTER(VCPU, inject_mchk),
+ STATS_DESC_COUNTER(VCPU, inject_pfault_init),
+ STATS_DESC_COUNTER(VCPU, inject_program),
+ STATS_DESC_COUNTER(VCPU, inject_restart),
+ STATS_DESC_COUNTER(VCPU, inject_set_prefix),
+ STATS_DESC_COUNTER(VCPU, inject_stop_signal),
+ STATS_DESC_COUNTER(VCPU, instruction_epsw),
+ STATS_DESC_COUNTER(VCPU, instruction_gs),
+ STATS_DESC_COUNTER(VCPU, instruction_io_other),
+ STATS_DESC_COUNTER(VCPU, instruction_lpsw),
+ STATS_DESC_COUNTER(VCPU, instruction_lpswe),
+ STATS_DESC_COUNTER(VCPU, instruction_pfmf),
+ STATS_DESC_COUNTER(VCPU, instruction_ptff),
+ STATS_DESC_COUNTER(VCPU, instruction_sck),
+ STATS_DESC_COUNTER(VCPU, instruction_sckpf),
+ STATS_DESC_COUNTER(VCPU, instruction_stidp),
+ STATS_DESC_COUNTER(VCPU, instruction_spx),
+ STATS_DESC_COUNTER(VCPU, instruction_stpx),
+ STATS_DESC_COUNTER(VCPU, instruction_stap),
+ STATS_DESC_COUNTER(VCPU, instruction_iske),
+ STATS_DESC_COUNTER(VCPU, instruction_ri),
+ STATS_DESC_COUNTER(VCPU, instruction_rrbe),
+ STATS_DESC_COUNTER(VCPU, instruction_sske),
+ STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
+ STATS_DESC_COUNTER(VCPU, instruction_stsi),
+ STATS_DESC_COUNTER(VCPU, instruction_stfl),
+ STATS_DESC_COUNTER(VCPU, instruction_tb),
+ STATS_DESC_COUNTER(VCPU, instruction_tpi),
+ STATS_DESC_COUNTER(VCPU, instruction_tprot),
+ STATS_DESC_COUNTER(VCPU, instruction_tsch),
+ STATS_DESC_COUNTER(VCPU, instruction_sie),
+ STATS_DESC_COUNTER(VCPU, instruction_essa),
+ STATS_DESC_COUNTER(VCPU, instruction_sthyi),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
+ STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_10),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_44),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c),
+ STATS_DESC_COUNTER(VCPU, diag_9c_ignored),
+ STATS_DESC_COUNTER(VCPU, diag_9c_forward),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_258),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_308),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_500),
+ STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
+ STATS_DESC_COUNTER(VCPU, pfault_sync)
+};
+
+const struct kvm_stats_header kvm_vcpu_stats_header = {
+ .name_size = KVM_STATS_NAME_SIZE,
+ .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
+ .id_offset = sizeof(struct kvm_stats_header),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+ sizeof(kvm_vcpu_stats_desc),
+};
+
+/* allow nested virtualization in KVM (if enabled by user space) */
+static int nested;
+module_param(nested, int, S_IRUGO);
+MODULE_PARM_DESC(nested, "Nested virtualization support");
+
+/* allow 1m huge page guest backing, if !nested */
+static int hpage;
+module_param(hpage, int, 0444);
+MODULE_PARM_DESC(hpage, "1m huge page backing support");
+
+/* maximum percentage of steal time for polling. >100 is treated like 100 */
+static u8 halt_poll_max_steal = 10;
+module_param(halt_poll_max_steal, byte, 0644);
+MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
+
+/* if set to true, the GISA will be initialized and used if available */
+static bool use_gisa = true;
+module_param(use_gisa, bool, 0644);
+MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");
+
+/* maximum diag9c forwarding per second */
+unsigned int diag9c_forwarding_hz;
+module_param(diag9c_forwarding_hz, uint, 0644);
+MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
+
+/*
+ * For now we handle at most 16 double words as this is what the s390 base
+ * kernel handles and stores in the prefix page. If we ever need to go beyond
+ * this, this requires changes to code, but the external uapi can stay.
+ */
+#define SIZE_INTERNAL 16
+
+/*
+ * Base feature mask that defines default mask for facilities. Consists of the
+ * defines in FACILITIES_KVM and the non-hypervisor managed bits.
+ */
+static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
+/*
+ * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
+ * and defines the facilities that can be enabled via a cpu model.
+ */
+static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
+
+static unsigned long kvm_s390_fac_size(void)
+{
+ BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
+ BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
+ BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
+ sizeof(stfle_fac_list));
+
+ return SIZE_INTERNAL;
+}
+
+/* available cpu features supported by kvm */
+static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
+/* available subfunctions indicated via query / "test bit" */
+static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
+
+static struct gmap_notifier gmap_notifier;
+static struct gmap_notifier vsie_gmap_notifier;
+debug_info_t *kvm_s390_dbf;
+debug_info_t *kvm_s390_dbf_uv;
+
+/* Section: not file related */
+int kvm_arch_hardware_enable(void)
+{
+ /* every s390 is virtualization enabled ;-) */
+ return 0;
+}
+
+int kvm_arch_check_processor_compat(void *opaque)
+{
+ return 0;
+}
+
+/* forward declarations */
+static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
+ unsigned long end);
+static int sca_switch_to_extended(struct kvm *kvm);
+
+static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
+{
+ u8 delta_idx = 0;
+
+ /*
+ * The TOD jumps by delta, we have to compensate this by adding
+ * -delta to the epoch.
+ */
+ delta = -delta;
+
+ /* sign-extension - we're adding to signed values below */
+ if ((s64)delta < 0)
+ delta_idx = -1;
+
+ scb->epoch += delta;
+ if (scb->ecd & ECD_MEF) {
+ scb->epdx += delta_idx;
+ if (scb->epoch < delta)
+ scb->epdx += 1;
+ }
+}
+
+/*
+ * This callback is executed during stop_machine(). All CPUs are therefore
+ * temporarily stopped. In order not to change guest behavior, we have to
+ * disable preemption whenever we touch the epoch of kvm and the VCPUs,
+ * so a CPU won't be stopped while calculating with the epoch.
+ */
+static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
+ void *v)
+{
+ struct kvm *kvm;
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+ unsigned long long *delta = v;
+
+ list_for_each_entry(kvm, &vm_list, vm_list) {
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
+ if (i == 0) {
+ kvm->arch.epoch = vcpu->arch.sie_block->epoch;
+ kvm->arch.epdx = vcpu->arch.sie_block->epdx;
+ }
+ if (vcpu->arch.cputm_enabled)
+ vcpu->arch.cputm_start += *delta;
+ if (vcpu->arch.vsie_block)
+ kvm_clock_sync_scb(vcpu->arch.vsie_block,
+ *delta);
+ }
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block kvm_clock_notifier = {
+ .notifier_call = kvm_clock_sync,
+};
+
+int kvm_arch_hardware_setup(void *opaque)
+{
+ gmap_notifier.notifier_call = kvm_gmap_notifier;
+ gmap_register_pte_notifier(&gmap_notifier);
+ vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
+ gmap_register_pte_notifier(&vsie_gmap_notifier);
+ atomic_notifier_chain_register(&s390_epoch_delta_notifier,
+ &kvm_clock_notifier);
+ return 0;
+}
+
+void kvm_arch_hardware_unsetup(void)
+{
+ gmap_unregister_pte_notifier(&gmap_notifier);
+ gmap_unregister_pte_notifier(&vsie_gmap_notifier);
+ atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
+ &kvm_clock_notifier);
+}
+
+static void allow_cpu_feat(unsigned long nr)
+{
+ set_bit_inv(nr, kvm_s390_available_cpu_feat);
+}
+
+static inline int plo_test_bit(unsigned char nr)
+{
+ unsigned long function = (unsigned long)nr | 0x100;
+ int cc;
+
+ asm volatile(
+ " lgr 0,%[function]\n"
+ /* Parameter registers are ignored for "test bit" */
+ " plo 0,0,0,0(0)\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (cc)
+ : [function] "d" (function)
+ : "cc", "0");
+ return cc == 0;
+}
+
+static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
+{
+ asm volatile(
+ " lghi 0,0\n"
+ " lgr 1,%[query]\n"
+ /* Parameter registers are ignored */
+ " .insn rrf,%[opc] << 16,2,4,6,0\n"
+ :
+ : [query] "d" ((unsigned long)query), [opc] "i" (opcode)
+ : "cc", "memory", "0", "1");
+}
+
+#define INSN_SORTL 0xb938
+#define INSN_DFLTCC 0xb939
+
+static void kvm_s390_cpu_feat_init(void)
+{
+ int i;
+
+ for (i = 0; i < 256; ++i) {
+ if (plo_test_bit(i))
+ kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
+ }
+
+ if (test_facility(28)) /* TOD-clock steering */
+ ptff(kvm_s390_available_subfunc.ptff,
+ sizeof(kvm_s390_available_subfunc.ptff),
+ PTFF_QAF);
+
+ if (test_facility(17)) { /* MSA */
+ __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kmac);
+ __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kmc);
+ __cpacf_query(CPACF_KM, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.km);
+ __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kimd);
+ __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.klmd);
+ }
+ if (test_facility(76)) /* MSA3 */
+ __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.pckmo);
+ if (test_facility(77)) { /* MSA4 */
+ __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kmctr);
+ __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kmf);
+ __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kmo);
+ __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.pcc);
+ }
+ if (test_facility(57)) /* MSA5 */
+ __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.ppno);
+
+ if (test_facility(146)) /* MSA8 */
+ __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kma);
+
+ if (test_facility(155)) /* MSA9 */
+ __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
+ kvm_s390_available_subfunc.kdsa);
+
+ if (test_facility(150)) /* SORTL */
+ __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);
+
+ if (test_facility(151)) /* DFLTCC */
+ __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
+
+ if (MACHINE_HAS_ESOP)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
+ /*
+ * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
+ * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
+ */
+ if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
+ !test_facility(3) || !nested)
+ return;
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
+ if (sclp.has_64bscao)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
+ if (sclp.has_siif)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
+ if (sclp.has_gpere)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
+ if (sclp.has_gsls)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
+ if (sclp.has_ib)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
+ if (sclp.has_cei)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
+ if (sclp.has_ibs)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
+ if (sclp.has_kss)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
+ /*
+ * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
+ * all skey handling functions read/set the skey from the PGSTE
+ * instead of the real storage key.
+ *
+ * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
+ * pages being detected as preserved although they are resident.
+ *
+ * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
+ * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
+ *
+ * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
+ * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
+ * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
+ *
+ * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
+ * cannot easily shadow the SCA because of the ipte lock.
+ */
+}
+
+int kvm_arch_init(void *opaque)
+{
+ int rc = -ENOMEM;
+
+ kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
+ if (!kvm_s390_dbf)
+ return -ENOMEM;
+
+ kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
+ if (!kvm_s390_dbf_uv)
+ goto out;
+
+ if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
+ debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
+ goto out;
+
+ kvm_s390_cpu_feat_init();
+
+ /* Register floating interrupt controller interface. */
+ rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
+ if (rc) {
+ pr_err("A FLIC registration call failed with rc=%d\n", rc);
+ goto out;
+ }
+
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
+ rc = kvm_s390_pci_init();
+ if (rc) {
+ pr_err("Unable to allocate AIFT for PCI\n");
+ goto out;
+ }
+ }
+
+ rc = kvm_s390_gib_init(GAL_ISC);
+ if (rc)
+ goto out;
+
+ return 0;
+
+out:
+ kvm_arch_exit();
+ return rc;
+}
+
+void kvm_arch_exit(void)
+{
+ kvm_s390_gib_destroy();
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
+ kvm_s390_pci_exit();
+ debug_unregister(kvm_s390_dbf);
+ debug_unregister(kvm_s390_dbf_uv);
+}
+
+/* Section: device related */
+long kvm_arch_dev_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ if (ioctl == KVM_S390_ENABLE_SIE)
+ return s390_enable_sie();
+ return -EINVAL;
+}
+
+int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
+{
+ int r;
+
+ switch (ext) {
+ case KVM_CAP_S390_PSW:
+ case KVM_CAP_S390_GMAP:
+ case KVM_CAP_SYNC_MMU:
+#ifdef CONFIG_KVM_S390_UCONTROL
+ case KVM_CAP_S390_UCONTROL:
+#endif
+ case KVM_CAP_ASYNC_PF:
+ case KVM_CAP_SYNC_REGS:
+ case KVM_CAP_ONE_REG:
+ case KVM_CAP_ENABLE_CAP:
+ case KVM_CAP_S390_CSS_SUPPORT:
+ case KVM_CAP_IOEVENTFD:
+ case KVM_CAP_DEVICE_CTRL:
+ case KVM_CAP_S390_IRQCHIP:
+ case KVM_CAP_VM_ATTRIBUTES:
+ case KVM_CAP_MP_STATE:
+ case KVM_CAP_IMMEDIATE_EXIT:
+ case KVM_CAP_S390_INJECT_IRQ:
+ case KVM_CAP_S390_USER_SIGP:
+ case KVM_CAP_S390_USER_STSI:
+ case KVM_CAP_S390_SKEYS:
+ case KVM_CAP_S390_IRQ_STATE:
+ case KVM_CAP_S390_USER_INSTR0:
+ case KVM_CAP_S390_CMMA_MIGRATION:
+ case KVM_CAP_S390_AIS:
+ case KVM_CAP_S390_AIS_MIGRATION:
+ case KVM_CAP_S390_VCPU_RESETS:
+ case KVM_CAP_SET_GUEST_DEBUG:
+ case KVM_CAP_S390_DIAG318:
+ case KVM_CAP_S390_MEM_OP_EXTENSION:
+ r = 1;
+ break;
+ case KVM_CAP_SET_GUEST_DEBUG2:
+ r = KVM_GUESTDBG_VALID_MASK;
+ break;
+ case KVM_CAP_S390_HPAGE_1M:
+ r = 0;
+ if (hpage && !kvm_is_ucontrol(kvm))
+ r = 1;
+ break;
+ case KVM_CAP_S390_MEM_OP:
+ r = MEM_OP_MAX_SIZE;
+ break;
+ case KVM_CAP_NR_VCPUS:
+ case KVM_CAP_MAX_VCPUS:
+ case KVM_CAP_MAX_VCPU_ID:
+ r = KVM_S390_BSCA_CPU_SLOTS;
+ if (!kvm_s390_use_sca_entries())
+ r = KVM_MAX_VCPUS;
+ else if (sclp.has_esca && sclp.has_64bscao)
+ r = KVM_S390_ESCA_CPU_SLOTS;
+ if (ext == KVM_CAP_NR_VCPUS)
+ r = min_t(unsigned int, num_online_cpus(), r);
+ break;
+ case KVM_CAP_S390_COW:
+ r = MACHINE_HAS_ESOP;
+ break;
+ case KVM_CAP_S390_VECTOR_REGISTERS:
+ r = MACHINE_HAS_VX;
+ break;
+ case KVM_CAP_S390_RI:
+ r = test_facility(64);
+ break;
+ case KVM_CAP_S390_GS:
+ r = test_facility(133);
+ break;
+ case KVM_CAP_S390_BPB:
+ r = test_facility(82);
+ break;
+ case KVM_CAP_S390_PROTECTED:
+ r = is_prot_virt_host();
+ break;
+ case KVM_CAP_S390_PROTECTED_DUMP: {
+ u64 pv_cmds_dump[] = {
+ BIT_UVC_CMD_DUMP_INIT,
+ BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
+ BIT_UVC_CMD_DUMP_CPU,
+ BIT_UVC_CMD_DUMP_COMPLETE,
+ };
+ int i;
+
+ r = is_prot_virt_host();
+
+ for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
+ if (!test_bit_inv(pv_cmds_dump[i],
+ (unsigned long *)&uv_info.inst_calls_list)) {
+ r = 0;
+ break;
+ }
+ }
+ break;
+ }
+ case KVM_CAP_S390_ZPCI_OP:
+ r = kvm_s390_pci_interp_allowed();
+ break;
+ case KVM_CAP_S390_CPU_TOPOLOGY:
+ r = test_facility(11);
+ break;
+ default:
+ r = 0;
+ }
+ return r;
+}
+
+void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
+{
+ int i;
+ gfn_t cur_gfn, last_gfn;
+ unsigned long gaddr, vmaddr;
+ struct gmap *gmap = kvm->arch.gmap;
+ DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
+
+ /* Loop over all guest segments */
+ cur_gfn = memslot->base_gfn;
+ last_gfn = memslot->base_gfn + memslot->npages;
+ for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
+ gaddr = gfn_to_gpa(cur_gfn);
+ vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
+ if (kvm_is_error_hva(vmaddr))
+ continue;
+
+ bitmap_zero(bitmap, _PAGE_ENTRIES);
+ gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
+ for (i = 0; i < _PAGE_ENTRIES; i++) {
+ if (test_bit(i, bitmap))
+ mark_page_dirty(kvm, cur_gfn + i);
+ }
+
+ if (fatal_signal_pending(current))
+ return;
+ cond_resched();
+ }
+}
+
+/* Section: vm related */
+static void sca_del_vcpu(struct kvm_vcpu *vcpu);
+
+/*
+ * Get (and clear) the dirty memory log for a memory slot.
+ */
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
+ struct kvm_dirty_log *log)
+{
+ int r;
+ unsigned long n;
+ struct kvm_memory_slot *memslot;
+ int is_dirty;
+
+ if (kvm_is_ucontrol(kvm))
+ return -EINVAL;
+
+ mutex_lock(&kvm->slots_lock);
+
+ r = -EINVAL;
+ if (log->slot >= KVM_USER_MEM_SLOTS)
+ goto out;
+
+ r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
+ if (r)
+ goto out;
+
+ /* Clear the dirty log */
+ if (is_dirty) {
+ n = kvm_dirty_bitmap_bytes(memslot);
+ memset(memslot->dirty_bitmap, 0, n);
+ }
+ r = 0;
+out:
+ mutex_unlock(&kvm->slots_lock);
+ return r;
+}
+
+static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
+{
+ unsigned long i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
+ }
+}
+
+int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
+{
+ int r;
+
+ if (cap->flags)
+ return -EINVAL;
+
+ switch (cap->cap) {
+ case KVM_CAP_S390_IRQCHIP:
+ VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
+ kvm->arch.use_irqchip = 1;
+ r = 0;
+ break;
+ case KVM_CAP_S390_USER_SIGP:
+ VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
+ kvm->arch.user_sigp = 1;
+ r = 0;
+ break;
+ case KVM_CAP_S390_VECTOR_REGISTERS:
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else if (MACHINE_HAS_VX) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 129);
+ set_kvm_facility(kvm->arch.model.fac_list, 129);
+ if (test_facility(134)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 134);
+ set_kvm_facility(kvm->arch.model.fac_list, 134);
+ }
+ if (test_facility(135)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 135);
+ set_kvm_facility(kvm->arch.model.fac_list, 135);
+ }
+ if (test_facility(148)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 148);
+ set_kvm_facility(kvm->arch.model.fac_list, 148);
+ }
+ if (test_facility(152)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 152);
+ set_kvm_facility(kvm->arch.model.fac_list, 152);
+ }
+ if (test_facility(192)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 192);
+ set_kvm_facility(kvm->arch.model.fac_list, 192);
+ }
+ r = 0;
+ } else
+ r = -EINVAL;
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
+ r ? "(not available)" : "(success)");
+ break;
+ case KVM_CAP_S390_RI:
+ r = -EINVAL;
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else if (test_facility(64)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 64);
+ set_kvm_facility(kvm->arch.model.fac_list, 64);
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
+ r ? "(not available)" : "(success)");
+ break;
+ case KVM_CAP_S390_AIS:
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else {
+ set_kvm_facility(kvm->arch.model.fac_mask, 72);
+ set_kvm_facility(kvm->arch.model.fac_list, 72);
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: AIS %s",
+ r ? "(not available)" : "(success)");
+ break;
+ case KVM_CAP_S390_GS:
+ r = -EINVAL;
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else if (test_facility(133)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 133);
+ set_kvm_facility(kvm->arch.model.fac_list, 133);
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
+ r ? "(not available)" : "(success)");
+ break;
+ case KVM_CAP_S390_HPAGE_1M:
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus)
+ r = -EBUSY;
+ else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
+ r = -EINVAL;
+ else {
+ r = 0;
+ mmap_write_lock(kvm->mm);
+ kvm->mm->context.allow_gmap_hpage_1m = 1;
+ mmap_write_unlock(kvm->mm);
+ /*
+ * We might have to create fake 4k page
+ * tables. To avoid that the hardware works on
+ * stale PGSTEs, we emulate these instructions.
+ */
+ kvm->arch.use_skf = 0;
+ kvm->arch.use_pfmfi = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
+ r ? "(not available)" : "(success)");
+ break;
+ case KVM_CAP_S390_USER_STSI:
+ VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
+ kvm->arch.user_stsi = 1;
+ r = 0;
+ break;
+ case KVM_CAP_S390_USER_INSTR0:
+ VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
+ kvm->arch.user_instr0 = 1;
+ icpt_operexc_on_all_vcpus(kvm);
+ r = 0;
+ break;
+ case KVM_CAP_S390_CPU_TOPOLOGY:
+ r = -EINVAL;
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ r = -EBUSY;
+ } else if (test_facility(11)) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 11);
+ set_kvm_facility(kvm->arch.model.fac_list, 11);
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s",
+ r ? "(not available)" : "(success)");
+ break;
+ default:
+ r = -EINVAL;
+ break;
+ }
+ return r;
+}
+
+static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_MEM_LIMIT_SIZE:
+ ret = 0;
+ VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
+ kvm->arch.mem_limit);
+ if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
+ ret = -EFAULT;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ return ret;
+}
+
+static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+ unsigned int idx;
+ switch (attr->attr) {
+ case KVM_S390_VM_MEM_ENABLE_CMMA:
+ ret = -ENXIO;
+ if (!sclp.has_cmma)
+ break;
+
+ VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus)
+ ret = -EBUSY;
+ else if (kvm->mm->context.allow_gmap_hpage_1m)
+ ret = -EINVAL;
+ else {
+ kvm->arch.use_cmma = 1;
+ /* Not compatible with cmma. */
+ kvm->arch.use_pfmfi = 0;
+ ret = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ break;
+ case KVM_S390_VM_MEM_CLR_CMMA:
+ ret = -ENXIO;
+ if (!sclp.has_cmma)
+ break;
+ ret = -EINVAL;
+ if (!kvm->arch.use_cmma)
+ break;
+
+ VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
+ mutex_lock(&kvm->lock);
+ idx = srcu_read_lock(&kvm->srcu);
+ s390_reset_cmma(kvm->arch.gmap->mm);
+ srcu_read_unlock(&kvm->srcu, idx);
+ mutex_unlock(&kvm->lock);
+ ret = 0;
+ break;
+ case KVM_S390_VM_MEM_LIMIT_SIZE: {
+ unsigned long new_limit;
+
+ if (kvm_is_ucontrol(kvm))
+ return -EINVAL;
+
+ if (get_user(new_limit, (u64 __user *)attr->addr))
+ return -EFAULT;
+
+ if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
+ new_limit > kvm->arch.mem_limit)
+ return -E2BIG;
+
+ if (!new_limit)
+ return -EINVAL;
+
+ /* gmap_create takes last usable address */
+ if (new_limit != KVM_S390_NO_MEM_LIMIT)
+ new_limit -= 1;
+
+ ret = -EBUSY;
+ mutex_lock(&kvm->lock);
+ if (!kvm->created_vcpus) {
+ /* gmap_create will round the limit up */
+ struct gmap *new = gmap_create(current->mm, new_limit);
+
+ if (!new) {
+ ret = -ENOMEM;
+ } else {
+ gmap_remove(kvm->arch.gmap);
+ new->private = kvm;
+ kvm->arch.gmap = new;
+ ret = 0;
+ }
+ }
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
+ VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
+ (void *) kvm->arch.gmap->asce);
+ break;
+ }
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ return ret;
+}
+
+static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
+
+void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+
+ kvm_s390_vcpu_block_all(kvm);
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ kvm_s390_vcpu_crypto_setup(vcpu);
+ /* recreate the shadow crycb by leaving the VSIE handler */
+ kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
+ }
+
+ kvm_s390_vcpu_unblock_all(kvm);
+}
+
+static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ mutex_lock(&kvm->lock);
+ switch (attr->attr) {
+ case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
+ if (!test_kvm_facility(kvm, 76)) {
+ mutex_unlock(&kvm->lock);
+ return -EINVAL;
+ }
+ get_random_bytes(
+ kvm->arch.crypto.crycb->aes_wrapping_key_mask,
+ sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
+ kvm->arch.crypto.aes_kw = 1;
+ VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
+ break;
+ case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
+ if (!test_kvm_facility(kvm, 76)) {
+ mutex_unlock(&kvm->lock);
+ return -EINVAL;
+ }
+ get_random_bytes(
+ kvm->arch.crypto.crycb->dea_wrapping_key_mask,
+ sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
+ kvm->arch.crypto.dea_kw = 1;
+ VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
+ break;
+ case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
+ if (!test_kvm_facility(kvm, 76)) {
+ mutex_unlock(&kvm->lock);
+ return -EINVAL;
+ }
+ kvm->arch.crypto.aes_kw = 0;
+ memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
+ sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
+ VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
+ break;
+ case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
+ if (!test_kvm_facility(kvm, 76)) {
+ mutex_unlock(&kvm->lock);
+ return -EINVAL;
+ }
+ kvm->arch.crypto.dea_kw = 0;
+ memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
+ sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
+ VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
+ break;
+ case KVM_S390_VM_CRYPTO_ENABLE_APIE:
+ if (!ap_instructions_available()) {
+ mutex_unlock(&kvm->lock);
+ return -EOPNOTSUPP;
+ }
+ kvm->arch.crypto.apie = 1;
+ break;
+ case KVM_S390_VM_CRYPTO_DISABLE_APIE:
+ if (!ap_instructions_available()) {
+ mutex_unlock(&kvm->lock);
+ return -EOPNOTSUPP;
+ }
+ kvm->arch.crypto.apie = 0;
+ break;
+ default:
+ mutex_unlock(&kvm->lock);
+ return -ENXIO;
+ }
+
+ kvm_s390_vcpu_crypto_reset_all(kvm);
+ mutex_unlock(&kvm->lock);
+ return 0;
+}
+
+static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
+{
+ /* Only set the ECB bits after guest requests zPCI interpretation */
+ if (!vcpu->kvm->arch.use_zpci_interp)
+ return;
+
+ vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
+ vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
+}
+
+void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+
+ lockdep_assert_held(&kvm->lock);
+
+ if (!kvm_s390_pci_interp_allowed())
+ return;
+
+ /*
+ * If host is configured for PCI and the necessary facilities are
+ * available, turn on interpretation for the life of this guest
+ */
+ kvm->arch.use_zpci_interp = 1;
+
+ kvm_s390_vcpu_block_all(kvm);
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ kvm_s390_vcpu_pci_setup(vcpu);
+ kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
+ }
+
+ kvm_s390_vcpu_unblock_all(kvm);
+}
+
+static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
+{
+ unsigned long cx;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(cx, vcpu, kvm)
+ kvm_s390_sync_request(req, vcpu);
+}
+
+/*
+ * Must be called with kvm->srcu held to avoid races on memslots, and with
+ * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
+ */
+static int kvm_s390_vm_start_migration(struct kvm *kvm)
+{
+ struct kvm_memory_slot *ms;
+ struct kvm_memslots *slots;
+ unsigned long ram_pages = 0;
+ int bkt;
+
+ /* migration mode already enabled */
+ if (kvm->arch.migration_mode)
+ return 0;
+ slots = kvm_memslots(kvm);
+ if (!slots || kvm_memslots_empty(slots))
+ return -EINVAL;
+
+ if (!kvm->arch.use_cmma) {
+ kvm->arch.migration_mode = 1;
+ return 0;
+ }
+ /* mark all the pages in active slots as dirty */
+ kvm_for_each_memslot(ms, bkt, slots) {
+ if (!ms->dirty_bitmap)
+ return -EINVAL;
+ /*
+ * The second half of the bitmap is only used on x86,
+ * and would be wasted otherwise, so we put it to good
+ * use here to keep track of the state of the storage
+ * attributes.
+ */
+ memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
+ ram_pages += ms->npages;
+ }
+ atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
+ kvm->arch.migration_mode = 1;
+ kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
+ return 0;
+}
+
+/*
+ * Must be called with kvm->slots_lock to avoid races with ourselves and
+ * kvm_s390_vm_start_migration.
+ */
+static int kvm_s390_vm_stop_migration(struct kvm *kvm)
+{
+ /* migration mode already disabled */
+ if (!kvm->arch.migration_mode)
+ return 0;
+ kvm->arch.migration_mode = 0;
+ if (kvm->arch.use_cmma)
+ kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
+ return 0;
+}
+
+static int kvm_s390_vm_set_migration(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ int res = -ENXIO;
+
+ mutex_lock(&kvm->slots_lock);
+ switch (attr->attr) {
+ case KVM_S390_VM_MIGRATION_START:
+ res = kvm_s390_vm_start_migration(kvm);
+ break;
+ case KVM_S390_VM_MIGRATION_STOP:
+ res = kvm_s390_vm_stop_migration(kvm);
+ break;
+ default:
+ break;
+ }
+ mutex_unlock(&kvm->slots_lock);
+
+ return res;
+}
+
+static int kvm_s390_vm_get_migration(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ u64 mig = kvm->arch.migration_mode;
+
+ if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
+ return -ENXIO;
+
+ if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
+ return -EFAULT;
+ return 0;
+}
+
+static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod);
+
+static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_tod_clock gtod;
+
+ if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
+ return -EFAULT;
+
+ if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
+ return -EINVAL;
+ __kvm_s390_set_tod_clock(kvm, &gtod);
+
+ VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
+ gtod.epoch_idx, gtod.tod);
+
+ return 0;
+}
+
+static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ u8 gtod_high;
+
+ if (copy_from_user(&gtod_high, (void __user *)attr->addr,
+ sizeof(gtod_high)))
+ return -EFAULT;
+
+ if (gtod_high != 0)
+ return -EINVAL;
+ VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
+
+ return 0;
+}
+
+static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_tod_clock gtod = { 0 };
+
+ if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
+ sizeof(gtod.tod)))
+ return -EFAULT;
+
+ __kvm_s390_set_tod_clock(kvm, &gtod);
+ VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
+ return 0;
+}
+
+static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ if (attr->flags)
+ return -EINVAL;
+
+ mutex_lock(&kvm->lock);
+ /*
+ * For protected guests, the TOD is managed by the ultravisor, so trying
+ * to change it will never bring the expected results.
+ */
+ if (kvm_s390_pv_is_protected(kvm)) {
+ ret = -EOPNOTSUPP;
+ goto out_unlock;
+ }
+
+ switch (attr->attr) {
+ case KVM_S390_VM_TOD_EXT:
+ ret = kvm_s390_set_tod_ext(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD_HIGH:
+ ret = kvm_s390_set_tod_high(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD_LOW:
+ ret = kvm_s390_set_tod_low(kvm, attr);
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+
+out_unlock:
+ mutex_unlock(&kvm->lock);
+ return ret;
+}
+
+static void kvm_s390_get_tod_clock(struct kvm *kvm,
+ struct kvm_s390_vm_tod_clock *gtod)
+{
+ union tod_clock clk;
+
+ preempt_disable();
+
+ store_tod_clock_ext(&clk);
+
+ gtod->tod = clk.tod + kvm->arch.epoch;
+ gtod->epoch_idx = 0;
+ if (test_kvm_facility(kvm, 139)) {
+ gtod->epoch_idx = clk.ei + kvm->arch.epdx;
+ if (gtod->tod < clk.tod)
+ gtod->epoch_idx += 1;
+ }
+
+ preempt_enable();
+}
+
+static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_tod_clock gtod;
+
+ memset(&gtod, 0, sizeof(gtod));
+ kvm_s390_get_tod_clock(kvm, &gtod);
+ if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
+ return -EFAULT;
+
+ VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
+ gtod.epoch_idx, gtod.tod);
+ return 0;
+}
+
+static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ u8 gtod_high = 0;
+
+ if (copy_to_user((void __user *)attr->addr, &gtod_high,
+ sizeof(gtod_high)))
+ return -EFAULT;
+ VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
+
+ return 0;
+}
+
+static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ u64 gtod;
+
+ gtod = kvm_s390_get_tod_clock_fast(kvm);
+ if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
+ return -EFAULT;
+ VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
+
+ return 0;
+}
+
+static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ if (attr->flags)
+ return -EINVAL;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_TOD_EXT:
+ ret = kvm_s390_get_tod_ext(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD_HIGH:
+ ret = kvm_s390_get_tod_high(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD_LOW:
+ ret = kvm_s390_get_tod_low(kvm, attr);
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ return ret;
+}
+
+static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_processor *proc;
+ u16 lowest_ibc, unblocked_ibc;
+ int ret = 0;
+
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ ret = -EBUSY;
+ goto out;
+ }
+ proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
+ if (!proc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (!copy_from_user(proc, (void __user *)attr->addr,
+ sizeof(*proc))) {
+ kvm->arch.model.cpuid = proc->cpuid;
+ lowest_ibc = sclp.ibc >> 16 & 0xfff;
+ unblocked_ibc = sclp.ibc & 0xfff;
+ if (lowest_ibc && proc->ibc) {
+ if (proc->ibc > unblocked_ibc)
+ kvm->arch.model.ibc = unblocked_ibc;
+ else if (proc->ibc < lowest_ibc)
+ kvm->arch.model.ibc = lowest_ibc;
+ else
+ kvm->arch.model.ibc = proc->ibc;
+ }
+ memcpy(kvm->arch.model.fac_list, proc->fac_list,
+ S390_ARCH_FAC_LIST_SIZE_BYTE);
+ VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
+ kvm->arch.model.ibc,
+ kvm->arch.model.cpuid);
+ VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
+ kvm->arch.model.fac_list[0],
+ kvm->arch.model.fac_list[1],
+ kvm->arch.model.fac_list[2]);
+ } else
+ ret = -EFAULT;
+ kfree(proc);
+out:
+ mutex_unlock(&kvm->lock);
+ return ret;
+}
+
+static int kvm_s390_set_processor_feat(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_feat data;
+
+ if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
+ return -EFAULT;
+ if (!bitmap_subset((unsigned long *) data.feat,
+ kvm_s390_available_cpu_feat,
+ KVM_S390_VM_CPU_FEAT_NR_BITS))
+ return -EINVAL;
+
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ mutex_unlock(&kvm->lock);
+ return -EBUSY;
+ }
+ bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
+ mutex_unlock(&kvm->lock);
+ VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
+ data.feat[0],
+ data.feat[1],
+ data.feat[2]);
+ return 0;
+}
+
+static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus) {
+ mutex_unlock(&kvm->lock);
+ return -EBUSY;
+ }
+
+ if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
+ sizeof(struct kvm_s390_vm_cpu_subfunc))) {
+ mutex_unlock(&kvm->lock);
+ return -EFAULT;
+ }
+ mutex_unlock(&kvm->lock);
+
+ VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
+ VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
+ VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
+ VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
+ VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
+ VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
+ VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
+ VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
+
+ return 0;
+}
+
+static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret = -ENXIO;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ ret = kvm_s390_set_processor(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_PROCESSOR_FEAT:
+ ret = kvm_s390_set_processor_feat(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
+ ret = kvm_s390_set_processor_subfunc(kvm, attr);
+ break;
+ }
+ return ret;
+}
+
+static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_processor *proc;
+ int ret = 0;
+
+ proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
+ if (!proc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ proc->cpuid = kvm->arch.model.cpuid;
+ proc->ibc = kvm->arch.model.ibc;
+ memcpy(&proc->fac_list, kvm->arch.model.fac_list,
+ S390_ARCH_FAC_LIST_SIZE_BYTE);
+ VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
+ kvm->arch.model.ibc,
+ kvm->arch.model.cpuid);
+ VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
+ kvm->arch.model.fac_list[0],
+ kvm->arch.model.fac_list[1],
+ kvm->arch.model.fac_list[2]);
+ if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
+ ret = -EFAULT;
+ kfree(proc);
+out:
+ return ret;
+}
+
+static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_machine *mach;
+ int ret = 0;
+
+ mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT);
+ if (!mach) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ get_cpu_id((struct cpuid *) &mach->cpuid);
+ mach->ibc = sclp.ibc;
+ memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
+ S390_ARCH_FAC_LIST_SIZE_BYTE);
+ memcpy((unsigned long *)&mach->fac_list, stfle_fac_list,
+ sizeof(stfle_fac_list));
+ VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx",
+ kvm->arch.model.ibc,
+ kvm->arch.model.cpuid);
+ VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx",
+ mach->fac_mask[0],
+ mach->fac_mask[1],
+ mach->fac_mask[2]);
+ VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx",
+ mach->fac_list[0],
+ mach->fac_list[1],
+ mach->fac_list[2]);
+ if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
+ ret = -EFAULT;
+ kfree(mach);
+out:
+ return ret;
+}
+
+static int kvm_s390_get_processor_feat(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_feat data;
+
+ bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
+ if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
+ return -EFAULT;
+ VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
+ data.feat[0],
+ data.feat[1],
+ data.feat[2]);
+ return 0;
+}
+
+static int kvm_s390_get_machine_feat(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_feat data;
+
+ bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
+ if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
+ return -EFAULT;
+ VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
+ data.feat[0],
+ data.feat[1],
+ data.feat[2]);
+ return 0;
+}
+
+static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
+ sizeof(struct kvm_s390_vm_cpu_subfunc)))
+ return -EFAULT;
+
+ VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
+ VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
+ VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
+ VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
+ VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
+ VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
+ VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
+ VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
+ ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
+
+ return 0;
+}
+
+static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
+ sizeof(struct kvm_s390_vm_cpu_subfunc)))
+ return -EFAULT;
+
+ VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
+ ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
+ ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
+ VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
+ VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
+ VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
+ VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
+ VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
+ VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
+ VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
+ VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
+ VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
+ VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
+ ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
+ ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
+ VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+ ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
+ ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
+ ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
+ ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
+
+ return 0;
+}
+
+static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret = -ENXIO;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ ret = kvm_s390_get_processor(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MACHINE:
+ ret = kvm_s390_get_machine(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_PROCESSOR_FEAT:
+ ret = kvm_s390_get_processor_feat(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MACHINE_FEAT:
+ ret = kvm_s390_get_machine_feat(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
+ ret = kvm_s390_get_processor_subfunc(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
+ ret = kvm_s390_get_machine_subfunc(kvm, attr);
+ break;
+ }
+ return ret;
+}
+
+/**
+ * kvm_s390_update_topology_change_report - update CPU topology change report
+ * @kvm: guest KVM description
+ * @val: set or clear the MTCR bit
+ *
+ * Updates the Multiprocessor Topology-Change-Report bit to signal
+ * the guest with a topology change.
+ * This is only relevant if the topology facility is present.
+ *
+ * The SCA version, bsca or esca, doesn't matter as offset is the same.
+ */
+static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val)
+{
+ union sca_utility new, old;
+ struct bsca_block *sca;
+
+ read_lock(&kvm->arch.sca_lock);
+ sca = kvm->arch.sca;
+ do {
+ old = READ_ONCE(sca->utility);
+ new = old;
+ new.mtcr = val;
+ } while (cmpxchg(&sca->utility.val, old.val, new.val) != old.val);
+ read_unlock(&kvm->arch.sca_lock);
+}
+
+static int kvm_s390_set_topo_change_indication(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ if (!test_kvm_facility(kvm, 11))
+ return -ENXIO;
+
+ kvm_s390_update_topology_change_report(kvm, !!attr->attr);
+ return 0;
+}
+
+static int kvm_s390_get_topo_change_indication(struct kvm *kvm,
+ struct kvm_device_attr *attr)
+{
+ u8 topo;
+
+ if (!test_kvm_facility(kvm, 11))
+ return -ENXIO;
+
+ read_lock(&kvm->arch.sca_lock);
+ topo = ((struct bsca_block *)kvm->arch.sca)->utility.mtcr;
+ read_unlock(&kvm->arch.sca_lock);
+
+ return put_user(topo, (u8 __user *)attr->addr);
+}
+
+static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ switch (attr->group) {
+ case KVM_S390_VM_MEM_CTRL:
+ ret = kvm_s390_set_mem_control(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD:
+ ret = kvm_s390_set_tod(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MODEL:
+ ret = kvm_s390_set_cpu_model(kvm, attr);
+ break;
+ case KVM_S390_VM_CRYPTO:
+ ret = kvm_s390_vm_set_crypto(kvm, attr);
+ break;
+ case KVM_S390_VM_MIGRATION:
+ ret = kvm_s390_vm_set_migration(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = kvm_s390_set_topo_change_indication(kvm, attr);
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+
+ return ret;
+}
+
+static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ switch (attr->group) {
+ case KVM_S390_VM_MEM_CTRL:
+ ret = kvm_s390_get_mem_control(kvm, attr);
+ break;
+ case KVM_S390_VM_TOD:
+ ret = kvm_s390_get_tod(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MODEL:
+ ret = kvm_s390_get_cpu_model(kvm, attr);
+ break;
+ case KVM_S390_VM_MIGRATION:
+ ret = kvm_s390_vm_get_migration(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = kvm_s390_get_topo_change_indication(kvm, attr);
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+
+ return ret;
+}
+
+static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+
+ switch (attr->group) {
+ case KVM_S390_VM_MEM_CTRL:
+ switch (attr->attr) {
+ case KVM_S390_VM_MEM_ENABLE_CMMA:
+ case KVM_S390_VM_MEM_CLR_CMMA:
+ ret = sclp.has_cmma ? 0 : -ENXIO;
+ break;
+ case KVM_S390_VM_MEM_LIMIT_SIZE:
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
+ case KVM_S390_VM_TOD:
+ switch (attr->attr) {
+ case KVM_S390_VM_TOD_LOW:
+ case KVM_S390_VM_TOD_HIGH:
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
+ case KVM_S390_VM_CPU_MODEL:
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ case KVM_S390_VM_CPU_MACHINE:
+ case KVM_S390_VM_CPU_PROCESSOR_FEAT:
+ case KVM_S390_VM_CPU_MACHINE_FEAT:
+ case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
+ case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
+ case KVM_S390_VM_CRYPTO:
+ switch (attr->attr) {
+ case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
+ case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
+ case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
+ case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
+ ret = 0;
+ break;
+ case KVM_S390_VM_CRYPTO_ENABLE_APIE:
+ case KVM_S390_VM_CRYPTO_DISABLE_APIE:
+ ret = ap_instructions_available() ? 0 : -ENXIO;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
+ case KVM_S390_VM_MIGRATION:
+ ret = 0;
+ break;
+ case KVM_S390_VM_CPU_TOPOLOGY:
+ ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+
+ return ret;
+}
+
+static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
+{
+ uint8_t *keys;
+ uint64_t hva;
+ int srcu_idx, i, r = 0;
+
+ if (args->flags != 0)
+ return -EINVAL;
+
+ /* Is this guest using storage keys? */
+ if (!mm_uses_skeys(current->mm))
+ return KVM_S390_GET_SKEYS_NONE;
+
+ /* Enforce sane limit on memory allocation */
+ if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
+ return -EINVAL;
+
+ keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
+ if (!keys)
+ return -ENOMEM;
+
+ mmap_read_lock(current->mm);
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ for (i = 0; i < args->count; i++) {
+ hva = gfn_to_hva(kvm, args->start_gfn + i);
+ if (kvm_is_error_hva(hva)) {
+ r = -EFAULT;
+ break;
+ }
+
+ r = get_guest_storage_key(current->mm, hva, &keys[i]);
+ if (r)
+ break;
+ }
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ mmap_read_unlock(current->mm);
+
+ if (!r) {
+ r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
+ sizeof(uint8_t) * args->count);
+ if (r)
+ r = -EFAULT;
+ }
+
+ kvfree(keys);
+ return r;
+}
+
+static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
+{
+ uint8_t *keys;
+ uint64_t hva;
+ int srcu_idx, i, r = 0;
+ bool unlocked;
+
+ if (args->flags != 0)
+ return -EINVAL;
+
+ /* Enforce sane limit on memory allocation */
+ if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
+ return -EINVAL;
+
+ keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
+ if (!keys)
+ return -ENOMEM;
+
+ r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
+ sizeof(uint8_t) * args->count);
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+
+ /* Enable storage key handling for the guest */
+ r = s390_enable_skey();
+ if (r)
+ goto out;
+
+ i = 0;
+ mmap_read_lock(current->mm);
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ while (i < args->count) {
+ unlocked = false;
+ hva = gfn_to_hva(kvm, args->start_gfn + i);
+ if (kvm_is_error_hva(hva)) {
+ r = -EFAULT;
+ break;
+ }
+
+ /* Lowest order bit is reserved */
+ if (keys[i] & 0x01) {
+ r = -EINVAL;
+ break;
+ }
+
+ r = set_guest_storage_key(current->mm, hva, keys[i], 0);
+ if (r) {
+ r = fixup_user_fault(current->mm, hva,
+ FAULT_FLAG_WRITE, &unlocked);
+ if (r)
+ break;
+ }
+ if (!r)
+ i++;
+ }
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ mmap_read_unlock(current->mm);
+out:
+ kvfree(keys);
+ return r;
+}
+
+/*
+ * Base address and length must be sent at the start of each block, therefore
+ * it's cheaper to send some clean data, as long as it's less than the size of
+ * two longs.
+ */
+#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
+/* for consistency */
+#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
+
+static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
+ u8 *res, unsigned long bufsize)
+{
+ unsigned long pgstev, hva, cur_gfn = args->start_gfn;
+
+ args->count = 0;
+ while (args->count < bufsize) {
+ hva = gfn_to_hva(kvm, cur_gfn);
+ /*
+ * We return an error if the first value was invalid, but we
+ * return successfully if at least one value was copied.
+ */
+ if (kvm_is_error_hva(hva))
+ return args->count ? 0 : -EFAULT;
+ if (get_pgste(kvm->mm, hva, &pgstev) < 0)
+ pgstev = 0;
+ res[args->count++] = (pgstev >> 24) & 0x43;
+ cur_gfn++;
+ }
+
+ return 0;
+}
+
+static struct kvm_memory_slot *gfn_to_memslot_approx(struct kvm_memslots *slots,
+ gfn_t gfn)
+{
+ return ____gfn_to_memslot(slots, gfn, true);
+}
+
+static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
+ unsigned long cur_gfn)
+{
+ struct kvm_memory_slot *ms = gfn_to_memslot_approx(slots, cur_gfn);
+ unsigned long ofs = cur_gfn - ms->base_gfn;
+ struct rb_node *mnode = &ms->gfn_node[slots->node_idx];
+
+ if (ms->base_gfn + ms->npages <= cur_gfn) {
+ mnode = rb_next(mnode);
+ /* If we are above the highest slot, wrap around */
+ if (!mnode)
+ mnode = rb_first(&slots->gfn_tree);
+
+ ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
+ ofs = 0;
+ }
+
+ if (cur_gfn < ms->base_gfn)
+ ofs = 0;
+
+ ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
+ while (ofs >= ms->npages && (mnode = rb_next(mnode))) {
+ ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]);
+ ofs = find_first_bit(kvm_second_dirty_bitmap(ms), ms->npages);
+ }
+ return ms->base_gfn + ofs;
+}
+
+static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
+ u8 *res, unsigned long bufsize)
+{
+ unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
+ struct kvm_memslots *slots = kvm_memslots(kvm);
+ struct kvm_memory_slot *ms;
+
+ if (unlikely(kvm_memslots_empty(slots)))
+ return 0;
+
+ cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
+ ms = gfn_to_memslot(kvm, cur_gfn);
+ args->count = 0;
+ args->start_gfn = cur_gfn;
+ if (!ms)
+ return 0;
+ next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
+ mem_end = kvm_s390_get_gfn_end(slots);
+
+ while (args->count < bufsize) {
+ hva = gfn_to_hva(kvm, cur_gfn);
+ if (kvm_is_error_hva(hva))
+ return 0;
+ /* Decrement only if we actually flipped the bit to 0 */
+ if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
+ atomic64_dec(&kvm->arch.cmma_dirty_pages);
+ if (get_pgste(kvm->mm, hva, &pgstev) < 0)
+ pgstev = 0;
+ /* Save the value */
+ res[args->count++] = (pgstev >> 24) & 0x43;
+ /* If the next bit is too far away, stop. */
+ if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
+ return 0;
+ /* If we reached the previous "next", find the next one */
+ if (cur_gfn == next_gfn)
+ next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
+ /* Reached the end of memory or of the buffer, stop */
+ if ((next_gfn >= mem_end) ||
+ (next_gfn - args->start_gfn >= bufsize))
+ return 0;
+ cur_gfn++;
+ /* Reached the end of the current memslot, take the next one. */
+ if (cur_gfn - ms->base_gfn >= ms->npages) {
+ ms = gfn_to_memslot(kvm, cur_gfn);
+ if (!ms)
+ return 0;
+ }
+ }
+ return 0;
+}
+
+/*
+ * This function searches for the next page with dirty CMMA attributes, and
+ * saves the attributes in the buffer up to either the end of the buffer or
+ * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
+ * no trailing clean bytes are saved.
+ * In case no dirty bits were found, or if CMMA was not enabled or used, the
+ * output buffer will indicate 0 as length.
+ */
+static int kvm_s390_get_cmma_bits(struct kvm *kvm,
+ struct kvm_s390_cmma_log *args)
+{
+ unsigned long bufsize;
+ int srcu_idx, peek, ret;
+ u8 *values;
+
+ if (!kvm->arch.use_cmma)
+ return -ENXIO;
+ /* Invalid/unsupported flags were specified */
+ if (args->flags & ~KVM_S390_CMMA_PEEK)
+ return -EINVAL;
+ /* Migration mode query, and we are not doing a migration */
+ peek = !!(args->flags & KVM_S390_CMMA_PEEK);
+ if (!peek && !kvm->arch.migration_mode)
+ return -EINVAL;
+ /* CMMA is disabled or was not used, or the buffer has length zero */
+ bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
+ if (!bufsize || !kvm->mm->context.uses_cmm) {
+ memset(args, 0, sizeof(*args));
+ return 0;
+ }
+ /* We are not peeking, and there are no dirty pages */
+ if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
+ memset(args, 0, sizeof(*args));
+ return 0;
+ }
+
+ values = vmalloc(bufsize);
+ if (!values)
+ return -ENOMEM;
+
+ mmap_read_lock(kvm->mm);
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ if (peek)
+ ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
+ else
+ ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ mmap_read_unlock(kvm->mm);
+
+ if (kvm->arch.migration_mode)
+ args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
+ else
+ args->remaining = 0;
+
+ if (copy_to_user((void __user *)args->values, values, args->count))
+ ret = -EFAULT;
+
+ vfree(values);
+ return ret;
+}
+
+/*
+ * This function sets the CMMA attributes for the given pages. If the input
+ * buffer has zero length, no action is taken, otherwise the attributes are
+ * set and the mm->context.uses_cmm flag is set.
+ */
+static int kvm_s390_set_cmma_bits(struct kvm *kvm,
+ const struct kvm_s390_cmma_log *args)
+{
+ unsigned long hva, mask, pgstev, i;
+ uint8_t *bits;
+ int srcu_idx, r = 0;
+
+ mask = args->mask;
+
+ if (!kvm->arch.use_cmma)
+ return -ENXIO;
+ /* invalid/unsupported flags */
+ if (args->flags != 0)
+ return -EINVAL;
+ /* Enforce sane limit on memory allocation */
+ if (args->count > KVM_S390_CMMA_SIZE_MAX)
+ return -EINVAL;
+ /* Nothing to do */
+ if (args->count == 0)
+ return 0;
+
+ bits = vmalloc(array_size(sizeof(*bits), args->count));
+ if (!bits)
+ return -ENOMEM;
+
+ r = copy_from_user(bits, (void __user *)args->values, args->count);
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+
+ mmap_read_lock(kvm->mm);
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ for (i = 0; i < args->count; i++) {
+ hva = gfn_to_hva(kvm, args->start_gfn + i);
+ if (kvm_is_error_hva(hva)) {
+ r = -EFAULT;
+ break;
+ }
+
+ pgstev = bits[i];
+ pgstev = pgstev << 24;
+ mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
+ set_pgste_bits(kvm->mm, hva, mask, pgstev);
+ }
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ mmap_read_unlock(kvm->mm);
+
+ if (!kvm->mm->context.uses_cmm) {
+ mmap_write_lock(kvm->mm);
+ kvm->mm->context.uses_cmm = 1;
+ mmap_write_unlock(kvm->mm);
+ }
+out:
+ vfree(bits);
+ return r;
+}
+
+/**
+ * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
+ * non protected.
+ * @kvm: the VM whose protected vCPUs are to be converted
+ * @rc: return value for the RC field of the UVC (in case of error)
+ * @rrc: return value for the RRC field of the UVC (in case of error)
+ *
+ * Does not stop in case of error, tries to convert as many
+ * CPUs as possible. In case of error, the RC and RRC of the last error are
+ * returned.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
+int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+ u16 _rc, _rrc;
+ int ret = 0;
+
+ /*
+ * We ignore failures and try to destroy as many CPUs as possible.
+ * At the same time we must not free the assigned resources when
+ * this fails, as the ultravisor has still access to that memory.
+ * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
+ * behind.
+ * We want to return the first failure rc and rrc, though.
+ */
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ mutex_lock(&vcpu->mutex);
+ if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) {
+ *rc = _rc;
+ *rrc = _rrc;
+ ret = -EIO;
+ }
+ mutex_unlock(&vcpu->mutex);
+ }
+ /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */
+ if (use_gisa)
+ kvm_s390_gisa_enable(kvm);
+ return ret;
+}
+
+/**
+ * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
+ * to protected.
+ * @kvm: the VM whose protected vCPUs are to be converted
+ * @rc: return value for the RC field of the UVC (in case of error)
+ * @rrc: return value for the RRC field of the UVC (in case of error)
+ *
+ * Tries to undo the conversion in case of error.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
+static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
+{
+ unsigned long i;
+ int r = 0;
+ u16 dummy;
+
+ struct kvm_vcpu *vcpu;
+
+ /* Disable the GISA if the ultravisor does not support AIV. */
+ if (!test_bit_inv(BIT_UV_FEAT_AIV, &uv_info.uv_feature_indications))
+ kvm_s390_gisa_disable(kvm);
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ mutex_lock(&vcpu->mutex);
+ r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
+ mutex_unlock(&vcpu->mutex);
+ if (r)
+ break;
+ }
+ if (r)
+ kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
+ return r;
+}
+
+/*
+ * Here we provide user space with a direct interface to query UV
+ * related data like UV maxima and available features as well as
+ * feature specific data.
+ *
+ * To facilitate future extension of the data structures we'll try to
+ * write data up to the maximum requested length.
+ */
+static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)
+{
+ ssize_t len_min;
+
+ switch (info->header.id) {
+ case KVM_PV_INFO_VM: {
+ len_min = sizeof(info->header) + sizeof(info->vm);
+
+ if (info->header.len_max < len_min)
+ return -EINVAL;
+
+ memcpy(info->vm.inst_calls_list,
+ uv_info.inst_calls_list,
+ sizeof(uv_info.inst_calls_list));
+
+ /* It's max cpuid not max cpus, so it's off by one */
+ info->vm.max_cpus = uv_info.max_guest_cpu_id + 1;
+ info->vm.max_guests = uv_info.max_num_sec_conf;
+ info->vm.max_guest_addr = uv_info.max_sec_stor_addr;
+ info->vm.feature_indication = uv_info.uv_feature_indications;
+
+ return len_min;
+ }
+ case KVM_PV_INFO_DUMP: {
+ len_min = sizeof(info->header) + sizeof(info->dump);
+
+ if (info->header.len_max < len_min)
+ return -EINVAL;
+
+ info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len;
+ info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len;
+ info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len;
+ return len_min;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,
+ struct kvm_s390_pv_dmp dmp)
+{
+ int r = -EINVAL;
+ void __user *result_buff = (void __user *)dmp.buff_addr;
+
+ switch (dmp.subcmd) {
+ case KVM_PV_DUMP_INIT: {
+ if (kvm->arch.pv.dumping)
+ break;
+
+ /*
+ * Block SIE entry as concurrent dump UVCs could lead
+ * to validities.
+ */
+ kvm_s390_vcpu_block_all(kvm);
+
+ r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
+ UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x",
+ cmd->rc, cmd->rrc);
+ if (!r) {
+ kvm->arch.pv.dumping = true;
+ } else {
+ kvm_s390_vcpu_unblock_all(kvm);
+ r = -EINVAL;
+ }
+ break;
+ }
+ case KVM_PV_DUMP_CONFIG_STOR_STATE: {
+ if (!kvm->arch.pv.dumping)
+ break;
+
+ /*
+ * gaddr is an output parameter since we might stop
+ * early. As dmp will be copied back in our caller, we
+ * don't need to do it ourselves.
+ */
+ r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len,
+ &cmd->rc, &cmd->rrc);
+ break;
+ }
+ case KVM_PV_DUMP_COMPLETE: {
+ if (!kvm->arch.pv.dumping)
+ break;
+
+ r = -EINVAL;
+ if (dmp.buff_len < uv_info.conf_dump_finalize_len)
+ break;
+
+ r = kvm_s390_pv_dump_complete(kvm, result_buff,
+ &cmd->rc, &cmd->rrc);
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ break;
+ }
+
+ return r;
+}
+
+static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
+{
+ int r = 0;
+ u16 dummy;
+ void __user *argp = (void __user *)cmd->data;
+
+ switch (cmd->cmd) {
+ case KVM_PV_ENABLE: {
+ r = -EINVAL;
+ if (kvm_s390_pv_is_protected(kvm))
+ break;
+
+ /*
+ * FMT 4 SIE needs esca. As we never switch back to bsca from
+ * esca, we need no cleanup in the error cases below
+ */
+ r = sca_switch_to_extended(kvm);
+ if (r)
+ break;
+
+ mmap_write_lock(current->mm);
+ r = gmap_mark_unmergeable();
+ mmap_write_unlock(current->mm);
+ if (r)
+ break;
+
+ r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
+ if (r)
+ break;
+
+ r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
+ if (r)
+ kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
+
+ /* we need to block service interrupts from now on */
+ set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
+ break;
+ }
+ case KVM_PV_DISABLE: {
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
+ /*
+ * If a CPU could not be destroyed, destroy VM will also fail.
+ * There is no point in trying to destroy it. Instead return
+ * the rc and rrc from the first CPU that failed destroying.
+ */
+ if (r)
+ break;
+ r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc);
+
+ /* no need to block service interrupts any more */
+ clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
+ break;
+ }
+ case KVM_PV_SET_SEC_PARMS: {
+ struct kvm_s390_pv_sec_parm parms = {};
+ void *hdr;
+
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&parms, argp, sizeof(parms)))
+ break;
+
+ /* Currently restricted to 8KB */
+ r = -EINVAL;
+ if (parms.length > PAGE_SIZE * 2)
+ break;
+
+ r = -ENOMEM;
+ hdr = vmalloc(parms.length);
+ if (!hdr)
+ break;
+
+ r = -EFAULT;
+ if (!copy_from_user(hdr, (void __user *)parms.origin,
+ parms.length))
+ r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
+ &cmd->rc, &cmd->rrc);
+
+ vfree(hdr);
+ break;
+ }
+ case KVM_PV_UNPACK: {
+ struct kvm_s390_pv_unp unp = {};
+
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&unp, argp, sizeof(unp)))
+ break;
+
+ r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
+ &cmd->rc, &cmd->rrc);
+ break;
+ }
+ case KVM_PV_VERIFY: {
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
+ UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
+ cmd->rrc);
+ break;
+ }
+ case KVM_PV_PREP_RESET: {
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
+ UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
+ cmd->rc, cmd->rrc);
+ break;
+ }
+ case KVM_PV_UNSHARE_ALL: {
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
+ UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
+ cmd->rc, cmd->rrc);
+ break;
+ }
+ case KVM_PV_INFO: {
+ struct kvm_s390_pv_info info = {};
+ ssize_t data_len;
+
+ /*
+ * No need to check the VM protection here.
+ *
+ * Maybe user space wants to query some of the data
+ * when the VM is still unprotected. If we see the
+ * need to fence a new data command we can still
+ * return an error in the info handler.
+ */
+
+ r = -EFAULT;
+ if (copy_from_user(&info, argp, sizeof(info.header)))
+ break;
+
+ r = -EINVAL;
+ if (info.header.len_max < sizeof(info.header))
+ break;
+
+ data_len = kvm_s390_handle_pv_info(&info);
+ if (data_len < 0) {
+ r = data_len;
+ break;
+ }
+ /*
+ * If a data command struct is extended (multiple
+ * times) this can be used to determine how much of it
+ * is valid.
+ */
+ info.header.len_written = data_len;
+
+ r = -EFAULT;
+ if (copy_to_user(argp, &info, data_len))
+ break;
+
+ r = 0;
+ break;
+ }
+ case KVM_PV_DUMP: {
+ struct kvm_s390_pv_dmp dmp;
+
+ r = -EINVAL;
+ if (!kvm_s390_pv_is_protected(kvm))
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&dmp, argp, sizeof(dmp)))
+ break;
+
+ r = kvm_s390_pv_dmp(kvm, cmd, dmp);
+ if (r)
+ break;
+
+ if (copy_to_user(argp, &dmp, sizeof(dmp))) {
+ r = -EFAULT;
+ break;
+ }
+
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ }
+ return r;
+}
+
+static bool access_key_invalid(u8 access_key)
+{
+ return access_key > 0xf;
+}
+
+static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
+{
+ void __user *uaddr = (void __user *)mop->buf;
+ u64 supported_flags;
+ void *tmpbuf = NULL;
+ int r, srcu_idx;
+
+ supported_flags = KVM_S390_MEMOP_F_SKEY_PROTECTION
+ | KVM_S390_MEMOP_F_CHECK_ONLY;
+ if (mop->flags & ~supported_flags || !mop->size)
+ return -EINVAL;
+ if (mop->size > MEM_OP_MAX_SIZE)
+ return -E2BIG;
+ /*
+ * This is technically a heuristic only, if the kvm->lock is not
+ * taken, it is not guaranteed that the vm is/remains non-protected.
+ * This is ok from a kernel perspective, wrongdoing is detected
+ * on the access, -EFAULT is returned and the vm may crash the
+ * next time it accesses the memory in question.
+ * There is no sane usecase to do switching and a memop on two
+ * different CPUs at the same time.
+ */
+ if (kvm_s390_pv_get_handle(kvm))
+ return -EINVAL;
+ if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
+ if (access_key_invalid(mop->key))
+ return -EINVAL;
+ } else {
+ mop->key = 0;
+ }
+ if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
+ tmpbuf = vmalloc(mop->size);
+ if (!tmpbuf)
+ return -ENOMEM;
+ }
+
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+
+ if (kvm_is_error_gpa(kvm, mop->gaddr)) {
+ r = PGM_ADDRESSING;
+ goto out_unlock;
+ }
+
+ switch (mop->op) {
+ case KVM_S390_MEMOP_ABSOLUTE_READ: {
+ if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+ r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_FETCH, mop->key);
+ } else {
+ r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+ mop->size, GACC_FETCH, mop->key);
+ if (r == 0) {
+ if (copy_to_user(uaddr, tmpbuf, mop->size))
+ r = -EFAULT;
+ }
+ }
+ break;
+ }
+ case KVM_S390_MEMOP_ABSOLUTE_WRITE: {
+ if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+ r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key);
+ } else {
+ if (copy_from_user(tmpbuf, uaddr, mop->size)) {
+ r = -EFAULT;
+ break;
+ }
+ r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+ mop->size, GACC_STORE, mop->key);
+ }
+ break;
+ }
+ default:
+ r = -EINVAL;
+ }
+
+out_unlock:
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+
+ vfree(tmpbuf);
+ return r;
+}
+
+long kvm_arch_vm_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm *kvm = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ struct kvm_device_attr attr;
+ int r;
+
+ switch (ioctl) {
+ case KVM_S390_INTERRUPT: {
+ struct kvm_s390_interrupt s390int;
+
+ r = -EFAULT;
+ if (copy_from_user(&s390int, argp, sizeof(s390int)))
+ break;
+ r = kvm_s390_inject_vm(kvm, &s390int);
+ break;
+ }
+ case KVM_CREATE_IRQCHIP: {
+ struct kvm_irq_routing_entry routing;
+
+ r = -EINVAL;
+ if (kvm->arch.use_irqchip) {
+ /* Set up dummy routing. */
+ memset(&routing, 0, sizeof(routing));
+ r = kvm_set_irq_routing(kvm, &routing, 0, 0);
+ }
+ break;
+ }
+ case KVM_SET_DEVICE_ATTR: {
+ r = -EFAULT;
+ if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
+ break;
+ r = kvm_s390_vm_set_attr(kvm, &attr);
+ break;
+ }
+ case KVM_GET_DEVICE_ATTR: {
+ r = -EFAULT;
+ if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
+ break;
+ r = kvm_s390_vm_get_attr(kvm, &attr);
+ break;
+ }
+ case KVM_HAS_DEVICE_ATTR: {
+ r = -EFAULT;
+ if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
+ break;
+ r = kvm_s390_vm_has_attr(kvm, &attr);
+ break;
+ }
+ case KVM_S390_GET_SKEYS: {
+ struct kvm_s390_skeys args;
+
+ r = -EFAULT;
+ if (copy_from_user(&args, argp,
+ sizeof(struct kvm_s390_skeys)))
+ break;
+ r = kvm_s390_get_skeys(kvm, &args);
+ break;
+ }
+ case KVM_S390_SET_SKEYS: {
+ struct kvm_s390_skeys args;
+
+ r = -EFAULT;
+ if (copy_from_user(&args, argp,
+ sizeof(struct kvm_s390_skeys)))
+ break;
+ r = kvm_s390_set_skeys(kvm, &args);
+ break;
+ }
+ case KVM_S390_GET_CMMA_BITS: {
+ struct kvm_s390_cmma_log args;
+
+ r = -EFAULT;
+ if (copy_from_user(&args, argp, sizeof(args)))
+ break;
+ mutex_lock(&kvm->slots_lock);
+ r = kvm_s390_get_cmma_bits(kvm, &args);
+ mutex_unlock(&kvm->slots_lock);
+ if (!r) {
+ r = copy_to_user(argp, &args, sizeof(args));
+ if (r)
+ r = -EFAULT;
+ }
+ break;
+ }
+ case KVM_S390_SET_CMMA_BITS: {
+ struct kvm_s390_cmma_log args;
+
+ r = -EFAULT;
+ if (copy_from_user(&args, argp, sizeof(args)))
+ break;
+ mutex_lock(&kvm->slots_lock);
+ r = kvm_s390_set_cmma_bits(kvm, &args);
+ mutex_unlock(&kvm->slots_lock);
+ break;
+ }
+ case KVM_S390_PV_COMMAND: {
+ struct kvm_pv_cmd args;
+
+ /* protvirt means user cpu state */
+ kvm_s390_set_user_cpu_state_ctrl(kvm);
+ r = 0;
+ if (!is_prot_virt_host()) {
+ r = -EINVAL;
+ break;
+ }
+ if (copy_from_user(&args, argp, sizeof(args))) {
+ r = -EFAULT;
+ break;
+ }
+ if (args.flags) {
+ r = -EINVAL;
+ break;
+ }
+ mutex_lock(&kvm->lock);
+ r = kvm_s390_handle_pv(kvm, &args);
+ mutex_unlock(&kvm->lock);
+ if (copy_to_user(argp, &args, sizeof(args))) {
+ r = -EFAULT;
+ break;
+ }
+ break;
+ }
+ case KVM_S390_MEM_OP: {
+ struct kvm_s390_mem_op mem_op;
+
+ if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
+ r = kvm_s390_vm_mem_op(kvm, &mem_op);
+ else
+ r = -EFAULT;
+ break;
+ }
+ case KVM_S390_ZPCI_OP: {
+ struct kvm_s390_zpci_op args;
+
+ r = -EINVAL;
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
+ break;
+ if (copy_from_user(&args, argp, sizeof(args))) {
+ r = -EFAULT;
+ break;
+ }
+ r = kvm_s390_pci_zpci_op(kvm, &args);
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ }
+
+ return r;
+}
+
+static int kvm_s390_apxa_installed(void)
+{
+ struct ap_config_info info;
+
+ if (ap_instructions_available()) {
+ if (ap_qci(&info) == 0)
+ return info.apxa;
+ }
+
+ return 0;
+}
+
+/*
+ * The format of the crypto control block (CRYCB) is specified in the 3 low
+ * order bits of the CRYCB designation (CRYCBD) field as follows:
+ * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
+ * AP extended addressing (APXA) facility are installed.
+ * Format 1: The APXA facility is not installed but the MSAX3 facility is.
+ * Format 2: Both the APXA and MSAX3 facilities are installed
+ */
+static void kvm_s390_set_crycb_format(struct kvm *kvm)
+{
+ kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
+
+ /* Clear the CRYCB format bits - i.e., set format 0 by default */
+ kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
+
+ /* Check whether MSAX3 is installed */
+ if (!test_kvm_facility(kvm, 76))
+ return;
+
+ if (kvm_s390_apxa_installed())
+ kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
+ else
+ kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
+}
+
+/*
+ * kvm_arch_crypto_set_masks
+ *
+ * @kvm: pointer to the target guest's KVM struct containing the crypto masks
+ * to be set.
+ * @apm: the mask identifying the accessible AP adapters
+ * @aqm: the mask identifying the accessible AP domains
+ * @adm: the mask identifying the accessible AP control domains
+ *
+ * Set the masks that identify the adapters, domains and control domains to
+ * which the KVM guest is granted access.
+ *
+ * Note: The kvm->lock mutex must be locked by the caller before invoking this
+ * function.
+ */
+void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
+ unsigned long *aqm, unsigned long *adm)
+{
+ struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
+
+ kvm_s390_vcpu_block_all(kvm);
+
+ switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
+ case CRYCB_FORMAT2: /* APCB1 use 256 bits */
+ memcpy(crycb->apcb1.apm, apm, 32);
+ VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
+ apm[0], apm[1], apm[2], apm[3]);
+ memcpy(crycb->apcb1.aqm, aqm, 32);
+ VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
+ aqm[0], aqm[1], aqm[2], aqm[3]);
+ memcpy(crycb->apcb1.adm, adm, 32);
+ VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
+ adm[0], adm[1], adm[2], adm[3]);
+ break;
+ case CRYCB_FORMAT1:
+ case CRYCB_FORMAT0: /* Fall through both use APCB0 */
+ memcpy(crycb->apcb0.apm, apm, 8);
+ memcpy(crycb->apcb0.aqm, aqm, 2);
+ memcpy(crycb->apcb0.adm, adm, 2);
+ VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
+ apm[0], *((unsigned short *)aqm),
+ *((unsigned short *)adm));
+ break;
+ default: /* Can not happen */
+ break;
+ }
+
+ /* recreate the shadow crycb for each vcpu */
+ kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
+ kvm_s390_vcpu_unblock_all(kvm);
+}
+EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
+
+/*
+ * kvm_arch_crypto_clear_masks
+ *
+ * @kvm: pointer to the target guest's KVM struct containing the crypto masks
+ * to be cleared.
+ *
+ * Clear the masks that identify the adapters, domains and control domains to
+ * which the KVM guest is granted access.
+ *
+ * Note: The kvm->lock mutex must be locked by the caller before invoking this
+ * function.
+ */
+void kvm_arch_crypto_clear_masks(struct kvm *kvm)
+{
+ kvm_s390_vcpu_block_all(kvm);
+
+ memset(&kvm->arch.crypto.crycb->apcb0, 0,
+ sizeof(kvm->arch.crypto.crycb->apcb0));
+ memset(&kvm->arch.crypto.crycb->apcb1, 0,
+ sizeof(kvm->arch.crypto.crycb->apcb1));
+
+ VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
+ /* recreate the shadow crycb for each vcpu */
+ kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
+ kvm_s390_vcpu_unblock_all(kvm);
+}
+EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
+
+static u64 kvm_s390_get_initial_cpuid(void)
+{
+ struct cpuid cpuid;
+
+ get_cpu_id(&cpuid);
+ cpuid.version = 0xff;
+ return *((u64 *) &cpuid);
+}
+
+static void kvm_s390_crypto_init(struct kvm *kvm)
+{
+ kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
+ kvm_s390_set_crycb_format(kvm);
+ init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem);
+
+ if (!test_kvm_facility(kvm, 76))
+ return;
+
+ /* Enable AES/DEA protected key functions by default */
+ kvm->arch.crypto.aes_kw = 1;
+ kvm->arch.crypto.dea_kw = 1;
+ get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
+ sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
+ get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
+ sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
+}
+
+static void sca_dispose(struct kvm *kvm)
+{
+ if (kvm->arch.use_esca)
+ free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
+ else
+ free_page((unsigned long)(kvm->arch.sca));
+ kvm->arch.sca = NULL;
+}
+
+void kvm_arch_free_vm(struct kvm *kvm)
+{
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
+ kvm_s390_pci_clear_list(kvm);
+
+ __kvm_arch_free_vm(kvm);
+}
+
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+ gfp_t alloc_flags = GFP_KERNEL_ACCOUNT;
+ int i, rc;
+ char debug_name[16];
+ static unsigned long sca_offset;
+
+ rc = -EINVAL;
+#ifdef CONFIG_KVM_S390_UCONTROL
+ if (type & ~KVM_VM_S390_UCONTROL)
+ goto out_err;
+ if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
+ goto out_err;
+#else
+ if (type)
+ goto out_err;
+#endif
+
+ rc = s390_enable_sie();
+ if (rc)
+ goto out_err;
+
+ rc = -ENOMEM;
+
+ if (!sclp.has_64bscao)
+ alloc_flags |= GFP_DMA;
+ rwlock_init(&kvm->arch.sca_lock);
+ /* start with basic SCA */
+ kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
+ if (!kvm->arch.sca)
+ goto out_err;
+ mutex_lock(&kvm_lock);
+ sca_offset += 16;
+ if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
+ sca_offset = 0;
+ kvm->arch.sca = (struct bsca_block *)
+ ((char *) kvm->arch.sca + sca_offset);
+ mutex_unlock(&kvm_lock);
+
+ sprintf(debug_name, "kvm-%u", current->pid);
+
+ kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
+ if (!kvm->arch.dbf)
+ goto out_err;
+
+ BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
+ kvm->arch.sie_page2 =
+ (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
+ if (!kvm->arch.sie_page2)
+ goto out_err;
+
+ kvm->arch.sie_page2->kvm = kvm;
+ kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
+
+ for (i = 0; i < kvm_s390_fac_size(); i++) {
+ kvm->arch.model.fac_mask[i] = stfle_fac_list[i] &
+ (kvm_s390_fac_base[i] |
+ kvm_s390_fac_ext[i]);
+ kvm->arch.model.fac_list[i] = stfle_fac_list[i] &
+ kvm_s390_fac_base[i];
+ }
+ kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
+
+ /* we are always in czam mode - even on pre z14 machines */
+ set_kvm_facility(kvm->arch.model.fac_mask, 138);
+ set_kvm_facility(kvm->arch.model.fac_list, 138);
+ /* we emulate STHYI in kvm */
+ set_kvm_facility(kvm->arch.model.fac_mask, 74);
+ set_kvm_facility(kvm->arch.model.fac_list, 74);
+ if (MACHINE_HAS_TLB_GUEST) {
+ set_kvm_facility(kvm->arch.model.fac_mask, 147);
+ set_kvm_facility(kvm->arch.model.fac_list, 147);
+ }
+
+ if (css_general_characteristics.aiv && test_facility(65))
+ set_kvm_facility(kvm->arch.model.fac_mask, 65);
+
+ kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
+ kvm->arch.model.ibc = sclp.ibc & 0x0fff;
+
+ kvm_s390_crypto_init(kvm);
+
+ if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
+ mutex_lock(&kvm->lock);
+ kvm_s390_pci_init_list(kvm);
+ kvm_s390_vcpu_pci_enable_interp(kvm);
+ mutex_unlock(&kvm->lock);
+ }
+
+ mutex_init(&kvm->arch.float_int.ais_lock);
+ spin_lock_init(&kvm->arch.float_int.lock);
+ for (i = 0; i < FIRQ_LIST_COUNT; i++)
+ INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
+ init_waitqueue_head(&kvm->arch.ipte_wq);
+ mutex_init(&kvm->arch.ipte_mutex);
+
+ debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
+ VM_EVENT(kvm, 3, "vm created with type %lu", type);
+
+ if (type & KVM_VM_S390_UCONTROL) {
+ kvm->arch.gmap = NULL;
+ kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
+ } else {
+ if (sclp.hamax == U64_MAX)
+ kvm->arch.mem_limit = TASK_SIZE_MAX;
+ else
+ kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
+ sclp.hamax + 1);
+ kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
+ if (!kvm->arch.gmap)
+ goto out_err;
+ kvm->arch.gmap->private = kvm;
+ kvm->arch.gmap->pfault_enabled = 0;
+ }
+
+ kvm->arch.use_pfmfi = sclp.has_pfmfi;
+ kvm->arch.use_skf = sclp.has_skey;
+ spin_lock_init(&kvm->arch.start_stop_lock);
+ kvm_s390_vsie_init(kvm);
+ if (use_gisa)
+ kvm_s390_gisa_init(kvm);
+ KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
+
+ return 0;
+out_err:
+ free_page((unsigned long)kvm->arch.sie_page2);
+ debug_unregister(kvm->arch.dbf);
+ sca_dispose(kvm);
+ KVM_EVENT(3, "creation of vm failed: %d", rc);
+ return rc;
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+ u16 rc, rrc;
+
+ VCPU_EVENT(vcpu, 3, "%s", "free cpu");
+ trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
+ kvm_s390_clear_local_irqs(vcpu);
+ kvm_clear_async_pf_completion_queue(vcpu);
+ if (!kvm_is_ucontrol(vcpu->kvm))
+ sca_del_vcpu(vcpu);
+ kvm_s390_update_topology_change_report(vcpu->kvm, 1);
+
+ if (kvm_is_ucontrol(vcpu->kvm))
+ gmap_remove(vcpu->arch.gmap);
+
+ if (vcpu->kvm->arch.use_cmma)
+ kvm_s390_vcpu_unsetup_cmma(vcpu);
+ /* We can not hold the vcpu mutex here, we are already dying */
+ if (kvm_s390_pv_cpu_get_handle(vcpu))
+ kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
+ free_page((unsigned long)(vcpu->arch.sie_block));
+}
+
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+ u16 rc, rrc;
+
+ kvm_destroy_vcpus(kvm);
+ sca_dispose(kvm);
+ kvm_s390_gisa_destroy(kvm);
+ /*
+ * We are already at the end of life and kvm->lock is not taken.
+ * This is ok as the file descriptor is closed by now and nobody
+ * can mess with the pv state. To avoid lockdep_assert_held from
+ * complaining we do not use kvm_s390_pv_is_protected.
+ */
+ if (kvm_s390_pv_get_handle(kvm))
+ kvm_s390_pv_deinit_vm(kvm, &rc, &rrc);
+ /*
+ * Remove the mmu notifier only when the whole KVM VM is torn down,
+ * and only if one was registered to begin with. If the VM is
+ * currently not protected, but has been previously been protected,
+ * then it's possible that the notifier is still registered.
+ */
+ if (kvm->arch.pv.mmu_notifier.ops)
+ mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm);
+
+ debug_unregister(kvm->arch.dbf);
+ free_page((unsigned long)kvm->arch.sie_page2);
+ if (!kvm_is_ucontrol(kvm))
+ gmap_remove(kvm->arch.gmap);
+ kvm_s390_destroy_adapters(kvm);
+ kvm_s390_clear_float_irqs(kvm);
+ kvm_s390_vsie_destroy(kvm);
+ KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
+}
+
+/* Section: vcpu related */
+static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.gmap = gmap_create(current->mm, -1UL);
+ if (!vcpu->arch.gmap)
+ return -ENOMEM;
+ vcpu->arch.gmap->private = vcpu->kvm;
+
+ return 0;
+}
+
+static void sca_del_vcpu(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_s390_use_sca_entries())
+ return;
+ read_lock(&vcpu->kvm->arch.sca_lock);
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
+
+ clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
+ sca->cpu[vcpu->vcpu_id].sda = 0;
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+
+ clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
+ sca->cpu[vcpu->vcpu_id].sda = 0;
+ }
+ read_unlock(&vcpu->kvm->arch.sca_lock);
+}
+
+static void sca_add_vcpu(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_s390_use_sca_entries()) {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+
+ /* we still need the basic sca for the ipte control */
+ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
+ vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
+ return;
+ }
+ read_lock(&vcpu->kvm->arch.sca_lock);
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
+
+ sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
+ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
+ vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
+ vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
+ set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+
+ sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
+ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
+ vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
+ set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
+ }
+ read_unlock(&vcpu->kvm->arch.sca_lock);
+}
+
+/* Basic SCA to Extended SCA data copy routines */
+static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
+{
+ d->sda = s->sda;
+ d->sigp_ctrl.c = s->sigp_ctrl.c;
+ d->sigp_ctrl.scn = s->sigp_ctrl.scn;
+}
+
+static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
+{
+ int i;
+
+ d->ipte_control = s->ipte_control;
+ d->mcn[0] = s->mcn;
+ for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
+ sca_copy_entry(&d->cpu[i], &s->cpu[i]);
+}
+
+static int sca_switch_to_extended(struct kvm *kvm)
+{
+ struct bsca_block *old_sca = kvm->arch.sca;
+ struct esca_block *new_sca;
+ struct kvm_vcpu *vcpu;
+ unsigned long vcpu_idx;
+ u32 scaol, scaoh;
+
+ if (kvm->arch.use_esca)
+ return 0;
+
+ new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+ if (!new_sca)
+ return -ENOMEM;
+
+ scaoh = (u32)((u64)(new_sca) >> 32);
+ scaol = (u32)(u64)(new_sca) & ~0x3fU;
+
+ kvm_s390_vcpu_block_all(kvm);
+ write_lock(&kvm->arch.sca_lock);
+
+ sca_copy_b_to_e(new_sca, old_sca);
+
+ kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
+ vcpu->arch.sie_block->scaoh = scaoh;
+ vcpu->arch.sie_block->scaol = scaol;
+ vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
+ }
+ kvm->arch.sca = new_sca;
+ kvm->arch.use_esca = 1;
+
+ write_unlock(&kvm->arch.sca_lock);
+ kvm_s390_vcpu_unblock_all(kvm);
+
+ free_page((unsigned long)old_sca);
+
+ VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
+ old_sca, kvm->arch.sca);
+ return 0;
+}
+
+static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
+{
+ int rc;
+
+ if (!kvm_s390_use_sca_entries()) {
+ if (id < KVM_MAX_VCPUS)
+ return true;
+ return false;
+ }
+ if (id < KVM_S390_BSCA_CPU_SLOTS)
+ return true;
+ if (!sclp.has_esca || !sclp.has_64bscao)
+ return false;
+
+ rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
+
+ return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
+}
+
+/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
+static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
+ raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
+ vcpu->arch.cputm_start = get_tod_clock_fast();
+ raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
+}
+
+/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
+static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
+ raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
+ vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
+ vcpu->arch.cputm_start = 0;
+ raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
+}
+
+/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
+static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ WARN_ON_ONCE(vcpu->arch.cputm_enabled);
+ vcpu->arch.cputm_enabled = true;
+ __start_cpu_timer_accounting(vcpu);
+}
+
+/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
+static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
+ __stop_cpu_timer_accounting(vcpu);
+ vcpu->arch.cputm_enabled = false;
+}
+
+static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ preempt_disable(); /* protect from TOD sync and vcpu_load/put */
+ __enable_cpu_timer_accounting(vcpu);
+ preempt_enable();
+}
+
+static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
+{
+ preempt_disable(); /* protect from TOD sync and vcpu_load/put */
+ __disable_cpu_timer_accounting(vcpu);
+ preempt_enable();
+}
+
+/* set the cpu timer - may only be called from the VCPU thread itself */
+void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
+{
+ preempt_disable(); /* protect from TOD sync and vcpu_load/put */
+ raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
+ if (vcpu->arch.cputm_enabled)
+ vcpu->arch.cputm_start = get_tod_clock_fast();
+ vcpu->arch.sie_block->cputm = cputm;
+ raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
+ preempt_enable();
+}
+
+/* update and get the cpu timer - can also be called from other VCPU threads */
+__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
+{
+ unsigned int seq;
+ __u64 value;
+
+ if (unlikely(!vcpu->arch.cputm_enabled))
+ return vcpu->arch.sie_block->cputm;
+
+ preempt_disable(); /* protect from TOD sync and vcpu_load/put */
+ do {
+ seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
+ /*
+ * If the writer would ever execute a read in the critical
+ * section, e.g. in irq context, we have a deadlock.
+ */
+ WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
+ value = vcpu->arch.sie_block->cputm;
+ /* if cputm_start is 0, accounting is being started/stopped */
+ if (likely(vcpu->arch.cputm_start))
+ value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
+ } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
+ preempt_enable();
+ return value;
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+
+ gmap_enable(vcpu->arch.enabled_gmap);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
+ if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
+ __start_cpu_timer_accounting(vcpu);
+ vcpu->cpu = cpu;
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ vcpu->cpu = -1;
+ if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
+ __stop_cpu_timer_accounting(vcpu);
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
+ vcpu->arch.enabled_gmap = gmap_get_enabled();
+ gmap_disable(vcpu->arch.enabled_gmap);
+
+}
+
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+ mutex_lock(&vcpu->kvm->lock);
+ preempt_disable();
+ vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
+ vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
+ preempt_enable();
+ mutex_unlock(&vcpu->kvm->lock);
+ if (!kvm_is_ucontrol(vcpu->kvm)) {
+ vcpu->arch.gmap = vcpu->kvm->arch.gmap;
+ sca_add_vcpu(vcpu);
+ }
+ if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
+ vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
+ /* make vcpu_load load the right gmap on the first trigger */
+ vcpu->arch.enabled_gmap = vcpu->arch.gmap;
+}
+
+static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
+{
+ if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
+ test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
+ return true;
+ return false;
+}
+
+static bool kvm_has_pckmo_ecc(struct kvm *kvm)
+{
+ /* At least one ECC subfunction must be present */
+ return kvm_has_pckmo_subfunc(kvm, 32) ||
+ kvm_has_pckmo_subfunc(kvm, 33) ||
+ kvm_has_pckmo_subfunc(kvm, 34) ||
+ kvm_has_pckmo_subfunc(kvm, 40) ||
+ kvm_has_pckmo_subfunc(kvm, 41);
+
+}
+
+static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
+{
+ /*
+ * If the AP instructions are not being interpreted and the MSAX3
+ * facility is not configured for the guest, there is nothing to set up.
+ */
+ if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
+ return;
+
+ vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
+ vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
+ vcpu->arch.sie_block->eca &= ~ECA_APIE;
+ vcpu->arch.sie_block->ecd &= ~ECD_ECC;
+
+ if (vcpu->kvm->arch.crypto.apie)
+ vcpu->arch.sie_block->eca |= ECA_APIE;
+
+ /* Set up protected key support */
+ if (vcpu->kvm->arch.crypto.aes_kw) {
+ vcpu->arch.sie_block->ecb3 |= ECB3_AES;
+ /* ecc is also wrapped with AES key */
+ if (kvm_has_pckmo_ecc(vcpu->kvm))
+ vcpu->arch.sie_block->ecd |= ECD_ECC;
+ }
+
+ if (vcpu->kvm->arch.crypto.dea_kw)
+ vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
+}
+
+void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
+{
+ free_page(vcpu->arch.sie_block->cbrlo);
+ vcpu->arch.sie_block->cbrlo = 0;
+}
+
+int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL_ACCOUNT);
+ if (!vcpu->arch.sie_block->cbrlo)
+ return -ENOMEM;
+ return 0;
+}
+
+static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
+
+ vcpu->arch.sie_block->ibc = model->ibc;
+ if (test_kvm_facility(vcpu->kvm, 7))
+ vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
+}
+
+static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
+{
+ int rc = 0;
+ u16 uvrc, uvrrc;
+
+ atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
+ CPUSTAT_SM |
+ CPUSTAT_STOPPED);
+
+ if (test_kvm_facility(vcpu->kvm, 78))
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
+ else if (test_kvm_facility(vcpu->kvm, 8))
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
+
+ kvm_s390_vcpu_setup_model(vcpu);
+
+ /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
+ if (MACHINE_HAS_ESOP)
+ vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
+ if (test_kvm_facility(vcpu->kvm, 9))
+ vcpu->arch.sie_block->ecb |= ECB_SRSI;
+ if (test_kvm_facility(vcpu->kvm, 11))
+ vcpu->arch.sie_block->ecb |= ECB_PTF;
+ if (test_kvm_facility(vcpu->kvm, 73))
+ vcpu->arch.sie_block->ecb |= ECB_TE;
+ if (!kvm_is_ucontrol(vcpu->kvm))
+ vcpu->arch.sie_block->ecb |= ECB_SPECI;
+
+ if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
+ vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
+ if (test_kvm_facility(vcpu->kvm, 130))
+ vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
+ vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
+ if (sclp.has_cei)
+ vcpu->arch.sie_block->eca |= ECA_CEI;
+ if (sclp.has_ib)
+ vcpu->arch.sie_block->eca |= ECA_IB;
+ if (sclp.has_siif)
+ vcpu->arch.sie_block->eca |= ECA_SII;
+ if (sclp.has_sigpif)
+ vcpu->arch.sie_block->eca |= ECA_SIGPI;
+ if (test_kvm_facility(vcpu->kvm, 129)) {
+ vcpu->arch.sie_block->eca |= ECA_VX;
+ vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
+ }
+ if (test_kvm_facility(vcpu->kvm, 139))
+ vcpu->arch.sie_block->ecd |= ECD_MEF;
+ if (test_kvm_facility(vcpu->kvm, 156))
+ vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
+ if (vcpu->arch.sie_block->gd) {
+ vcpu->arch.sie_block->eca |= ECA_AIV;
+ VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
+ vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
+ }
+ vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
+ | SDNXC;
+ vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
+
+ if (sclp.has_kss)
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
+ else
+ vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
+
+ if (vcpu->kvm->arch.use_cmma) {
+ rc = kvm_s390_vcpu_setup_cmma(vcpu);
+ if (rc)
+ return rc;
+ }
+ hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
+
+ vcpu->arch.sie_block->hpid = HPID_KVM;
+
+ kvm_s390_vcpu_crypto_setup(vcpu);
+
+ kvm_s390_vcpu_pci_setup(vcpu);
+
+ mutex_lock(&vcpu->kvm->lock);
+ if (kvm_s390_pv_is_protected(vcpu->kvm)) {
+ rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
+ if (rc)
+ kvm_s390_vcpu_unsetup_cmma(vcpu);
+ }
+ mutex_unlock(&vcpu->kvm->lock);
+
+ return rc;
+}
+
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
+ return -EINVAL;
+ return 0;
+}
+
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
+{
+ struct sie_page *sie_page;
+ int rc;
+
+ BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
+ sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
+ if (!sie_page)
+ return -ENOMEM;
+
+ vcpu->arch.sie_block = &sie_page->sie_block;
+ vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
+
+ /* the real guest size will always be smaller than msl */
+ vcpu->arch.sie_block->mso = 0;
+ vcpu->arch.sie_block->msl = sclp.hamax;
+
+ vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
+ spin_lock_init(&vcpu->arch.local_int.lock);
+ vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm);
+ seqcount_init(&vcpu->arch.cputm_seqcount);
+
+ vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
+ kvm_clear_async_pf_completion_queue(vcpu);
+ vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
+ KVM_SYNC_GPRS |
+ KVM_SYNC_ACRS |
+ KVM_SYNC_CRS |
+ KVM_SYNC_ARCH0 |
+ KVM_SYNC_PFAULT |
+ KVM_SYNC_DIAG318;
+ kvm_s390_set_prefix(vcpu, 0);
+ if (test_kvm_facility(vcpu->kvm, 64))
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
+ if (test_kvm_facility(vcpu->kvm, 82))
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
+ if (test_kvm_facility(vcpu->kvm, 133))
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
+ if (test_kvm_facility(vcpu->kvm, 156))
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
+ /* fprs can be synchronized via vrs, even if the guest has no vx. With
+ * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
+ */
+ if (MACHINE_HAS_VX)
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
+ else
+ vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
+
+ if (kvm_is_ucontrol(vcpu->kvm)) {
+ rc = __kvm_ucontrol_vcpu_init(vcpu);
+ if (rc)
+ goto out_free_sie_block;
+ }
+
+ VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK",
+ vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
+ trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
+
+ rc = kvm_s390_vcpu_setup(vcpu);
+ if (rc)
+ goto out_ucontrol_uninit;
+
+ kvm_s390_update_topology_change_report(vcpu->kvm, 1);
+ return 0;
+
+out_ucontrol_uninit:
+ if (kvm_is_ucontrol(vcpu->kvm))
+ gmap_remove(vcpu->arch.gmap);
+out_free_sie_block:
+ free_page((unsigned long)(vcpu->arch.sie_block));
+ return rc;
+}
+
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
+{
+ clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
+ return kvm_s390_vcpu_has_irq(vcpu, 0);
+}
+
+bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
+{
+ return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
+}
+
+void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
+{
+ atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
+ exit_sie(vcpu);
+}
+
+void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
+{
+ atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
+}
+
+static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
+{
+ atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
+ exit_sie(vcpu);
+}
+
+bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
+{
+ return atomic_read(&vcpu->arch.sie_block->prog20) &
+ (PROG_BLOCK_SIE | PROG_REQUEST);
+}
+
+static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
+{
+ atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
+}
+
+/*
+ * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
+ * If the CPU is not running (e.g. waiting as idle) the function will
+ * return immediately. */
+void exit_sie(struct kvm_vcpu *vcpu)
+{
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
+ kvm_s390_vsie_kick(vcpu);
+ while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
+ cpu_relax();
+}
+
+/* Kick a guest cpu out of SIE to process a request synchronously */
+void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
+{
+ __kvm_make_request(req, vcpu);
+ kvm_s390_vcpu_request(vcpu);
+}
+
+static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
+ unsigned long end)
+{
+ struct kvm *kvm = gmap->private;
+ struct kvm_vcpu *vcpu;
+ unsigned long prefix;
+ unsigned long i;
+
+ if (gmap_is_shadow(gmap))
+ return;
+ if (start >= 1UL << 31)
+ /* We are only interested in prefix pages */
+ return;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ /* match against both prefix pages */
+ prefix = kvm_s390_get_prefix(vcpu);
+ if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
+ VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
+ start, end);
+ kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
+ }
+ }
+}
+
+bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
+{
+ /* do not poll with more than halt_poll_max_steal percent of steal time */
+ if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
+ READ_ONCE(halt_poll_max_steal)) {
+ vcpu->stat.halt_no_poll_steal++;
+ return true;
+ }
+ return false;
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+ /* kvm common code refers to this, but never calls it */
+ BUG();
+ return 0;
+}
+
+static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
+ struct kvm_one_reg *reg)
+{
+ int r = -EINVAL;
+
+ switch (reg->id) {
+ case KVM_REG_S390_TODPR:
+ r = put_user(vcpu->arch.sie_block->todpr,
+ (u32 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_EPOCHDIFF:
+ r = put_user(vcpu->arch.sie_block->epoch,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_CPU_TIMER:
+ r = put_user(kvm_s390_get_cpu_timer(vcpu),
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_CLOCK_COMP:
+ r = put_user(vcpu->arch.sie_block->ckc,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PFTOKEN:
+ r = put_user(vcpu->arch.pfault_token,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PFCOMPARE:
+ r = put_user(vcpu->arch.pfault_compare,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PFSELECT:
+ r = put_user(vcpu->arch.pfault_select,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PP:
+ r = put_user(vcpu->arch.sie_block->pp,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_GBEA:
+ r = put_user(vcpu->arch.sie_block->gbea,
+ (u64 __user *)reg->addr);
+ break;
+ default:
+ break;
+ }
+
+ return r;
+}
+
+static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
+ struct kvm_one_reg *reg)
+{
+ int r = -EINVAL;
+ __u64 val;
+
+ switch (reg->id) {
+ case KVM_REG_S390_TODPR:
+ r = get_user(vcpu->arch.sie_block->todpr,
+ (u32 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_EPOCHDIFF:
+ r = get_user(vcpu->arch.sie_block->epoch,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_CPU_TIMER:
+ r = get_user(val, (u64 __user *)reg->addr);
+ if (!r)
+ kvm_s390_set_cpu_timer(vcpu, val);
+ break;
+ case KVM_REG_S390_CLOCK_COMP:
+ r = get_user(vcpu->arch.sie_block->ckc,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PFTOKEN:
+ r = get_user(vcpu->arch.pfault_token,
+ (u64 __user *)reg->addr);
+ if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
+ kvm_clear_async_pf_completion_queue(vcpu);
+ break;
+ case KVM_REG_S390_PFCOMPARE:
+ r = get_user(vcpu->arch.pfault_compare,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PFSELECT:
+ r = get_user(vcpu->arch.pfault_select,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_PP:
+ r = get_user(vcpu->arch.sie_block->pp,
+ (u64 __user *)reg->addr);
+ break;
+ case KVM_REG_S390_GBEA:
+ r = get_user(vcpu->arch.sie_block->gbea,
+ (u64 __user *)reg->addr);
+ break;
+ default:
+ break;
+ }
+
+ return r;
+}
+
+static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
+ vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
+ memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));
+
+ kvm_clear_async_pf_completion_queue(vcpu);
+ if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
+ kvm_s390_vcpu_stop(vcpu);
+ kvm_s390_clear_local_irqs(vcpu);
+}
+
+static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
+{
+ /* Initial reset is a superset of the normal reset */
+ kvm_arch_vcpu_ioctl_normal_reset(vcpu);
+
+ /*
+ * This equals initial cpu reset in pop, but we don't switch to ESA.
+ * We do not only reset the internal data, but also ...
+ */
+ vcpu->arch.sie_block->gpsw.mask = 0;
+ vcpu->arch.sie_block->gpsw.addr = 0;
+ kvm_s390_set_prefix(vcpu, 0);
+ kvm_s390_set_cpu_timer(vcpu, 0);
+ vcpu->arch.sie_block->ckc = 0;
+ memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
+ vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
+ vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;
+
+ /* ... the data in sync regs */
+ memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs));
+ vcpu->run->s.regs.ckc = 0;
+ vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK;
+ vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK;
+ vcpu->run->psw_addr = 0;
+ vcpu->run->psw_mask = 0;
+ vcpu->run->s.regs.todpr = 0;
+ vcpu->run->s.regs.cputm = 0;
+ vcpu->run->s.regs.ckc = 0;
+ vcpu->run->s.regs.pp = 0;
+ vcpu->run->s.regs.gbea = 1;
+ vcpu->run->s.regs.fpc = 0;
+ /*
+ * Do not reset these registers in the protected case, as some of
+ * them are overlayed and they are not accessible in this case
+ * anyway.
+ */
+ if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->gbea = 1;
+ vcpu->arch.sie_block->pp = 0;
+ vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
+ vcpu->arch.sie_block->todpr = 0;
+ }
+}
+
+static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
+{
+ struct kvm_sync_regs *regs = &vcpu->run->s.regs;
+
+ /* Clear reset is a superset of the initial reset */
+ kvm_arch_vcpu_ioctl_initial_reset(vcpu);
+
+ memset(&regs->gprs, 0, sizeof(regs->gprs));
+ memset(&regs->vrs, 0, sizeof(regs->vrs));
+ memset(&regs->acrs, 0, sizeof(regs->acrs));
+ memset(&regs->gscb, 0, sizeof(regs->gscb));
+
+ regs->etoken = 0;
+ regs->etoken_extension = 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+ vcpu_load(vcpu);
+ memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
+ vcpu_put(vcpu);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+ vcpu_load(vcpu);
+ memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
+ vcpu_put(vcpu);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ vcpu_load(vcpu);
+
+ memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
+ memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
+
+ vcpu_put(vcpu);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ vcpu_load(vcpu);
+
+ memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
+ memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
+
+ vcpu_put(vcpu);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+ int ret = 0;
+
+ vcpu_load(vcpu);
+
+ if (test_fp_ctl(fpu->fpc)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ vcpu->run->s.regs.fpc = fpu->fpc;
+ if (MACHINE_HAS_VX)
+ convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
+ (freg_t *) fpu->fprs);
+ else
+ memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
+
+out:
+ vcpu_put(vcpu);
+ return ret;
+}
+
+int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+ vcpu_load(vcpu);
+
+ /* make sure we have the latest values */
+ save_fpu_regs();
+ if (MACHINE_HAS_VX)
+ convert_vx_to_fp((freg_t *) fpu->fprs,
+ (__vector128 *) vcpu->run->s.regs.vrs);
+ else
+ memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
+ fpu->fpc = vcpu->run->s.regs.fpc;
+
+ vcpu_put(vcpu);
+ return 0;
+}
+
+static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
+{
+ int rc = 0;
+
+ if (!is_vcpu_stopped(vcpu))
+ rc = -EBUSY;
+ else {
+ vcpu->run->psw_mask = psw.mask;
+ vcpu->run->psw_addr = psw.addr;
+ }
+ return rc;
+}
+
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+ struct kvm_translation *tr)
+{
+ return -EINVAL; /* not implemented yet */
+}
+
+#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
+ KVM_GUESTDBG_USE_HW_BP | \
+ KVM_GUESTDBG_ENABLE)
+
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+ struct kvm_guest_debug *dbg)
+{
+ int rc = 0;
+
+ vcpu_load(vcpu);
+
+ vcpu->guest_debug = 0;
+ kvm_s390_clear_bp_data(vcpu);
+
+ if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
+ rc = -EINVAL;
+ goto out;
+ }
+ if (!sclp.has_gpere) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (dbg->control & KVM_GUESTDBG_ENABLE) {
+ vcpu->guest_debug = dbg->control;
+ /* enforce guest PER */
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
+
+ if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
+ rc = kvm_s390_import_bp_data(vcpu, dbg);
+ } else {
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
+ vcpu->arch.guestdbg.last_bp = 0;
+ }
+
+ if (rc) {
+ vcpu->guest_debug = 0;
+ kvm_s390_clear_bp_data(vcpu);
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
+ }
+
+out:
+ vcpu_put(vcpu);
+ return rc;
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ int ret;
+
+ vcpu_load(vcpu);
+
+ /* CHECK_STOP and LOAD are not supported yet */
+ ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
+ KVM_MP_STATE_OPERATING;
+
+ vcpu_put(vcpu);
+ return ret;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ int rc = 0;
+
+ vcpu_load(vcpu);
+
+ /* user space knows about this interface - let it control the state */
+ kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm);
+
+ switch (mp_state->mp_state) {
+ case KVM_MP_STATE_STOPPED:
+ rc = kvm_s390_vcpu_stop(vcpu);
+ break;
+ case KVM_MP_STATE_OPERATING:
+ rc = kvm_s390_vcpu_start(vcpu);
+ break;
+ case KVM_MP_STATE_LOAD:
+ if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
+ rc = -ENXIO;
+ break;
+ }
+ rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
+ break;
+ case KVM_MP_STATE_CHECK_STOP:
+ fallthrough; /* CHECK_STOP and LOAD are not supported yet */
+ default:
+ rc = -ENXIO;
+ }
+
+ vcpu_put(vcpu);
+ return rc;
+}
+
+static bool ibs_enabled(struct kvm_vcpu *vcpu)
+{
+ return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
+}
+
+static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
+{
+retry:
+ kvm_s390_vcpu_request_handled(vcpu);
+ if (!kvm_request_pending(vcpu))
+ return 0;
+ /*
+ * If the guest prefix changed, re-arm the ipte notifier for the
+ * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
+ * This ensures that the ipte instruction for this request has
+ * already finished. We might race against a second unmapper that
+ * wants to set the blocking bit. Lets just retry the request loop.
+ */
+ if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) {
+ int rc;
+ rc = gmap_mprotect_notify(vcpu->arch.gmap,
+ kvm_s390_get_prefix(vcpu),
+ PAGE_SIZE * 2, PROT_WRITE);
+ if (rc) {
+ kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
+ return rc;
+ }
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
+ vcpu->arch.sie_block->ihcpu = 0xffff;
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
+ if (!ibs_enabled(vcpu)) {
+ trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
+ }
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
+ if (ibs_enabled(vcpu)) {
+ trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
+ }
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
+ vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
+ /*
+ * Disable CMM virtualization; we will emulate the ESSA
+ * instruction manually, in order to provide additional
+ * functionalities needed for live migration.
+ */
+ vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
+ goto retry;
+ }
+
+ if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
+ /*
+ * Re-enable CMM virtualization if CMMA is available and
+ * CMM has been used.
+ */
+ if ((vcpu->kvm->arch.use_cmma) &&
+ (vcpu->kvm->mm->context.uses_cmm))
+ vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
+ goto retry;
+ }
+
+ /* we left the vsie handler, nothing to do, just clear the request */
+ kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
+
+ return 0;
+}
+
+static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
+{
+ struct kvm_vcpu *vcpu;
+ union tod_clock clk;
+ unsigned long i;
+
+ preempt_disable();
+
+ store_tod_clock_ext(&clk);
+
+ kvm->arch.epoch = gtod->tod - clk.tod;
+ kvm->arch.epdx = 0;
+ if (test_kvm_facility(kvm, 139)) {
+ kvm->arch.epdx = gtod->epoch_idx - clk.ei;
+ if (kvm->arch.epoch > gtod->tod)
+ kvm->arch.epdx -= 1;
+ }
+
+ kvm_s390_vcpu_block_all(kvm);
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ vcpu->arch.sie_block->epoch = kvm->arch.epoch;
+ vcpu->arch.sie_block->epdx = kvm->arch.epdx;
+ }
+
+ kvm_s390_vcpu_unblock_all(kvm);
+ preempt_enable();
+}
+
+int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
+{
+ if (!mutex_trylock(&kvm->lock))
+ return 0;
+ __kvm_s390_set_tod_clock(kvm, gtod);
+ mutex_unlock(&kvm->lock);
+ return 1;
+}
+
+/**
+ * kvm_arch_fault_in_page - fault-in guest page if necessary
+ * @vcpu: The corresponding virtual cpu
+ * @gpa: Guest physical address
+ * @writable: Whether the page should be writable or not
+ *
+ * Make sure that a guest page has been faulted-in on the host.
+ *
+ * Return: Zero on success, negative error code otherwise.
+ */
+long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
+{
+ return gmap_fault(vcpu->arch.gmap, gpa,
+ writable ? FAULT_FLAG_WRITE : 0);
+}
+
+static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
+ unsigned long token)
+{
+ struct kvm_s390_interrupt inti;
+ struct kvm_s390_irq irq;
+
+ if (start_token) {
+ irq.u.ext.ext_params2 = token;
+ irq.type = KVM_S390_INT_PFAULT_INIT;
+ WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
+ } else {
+ inti.type = KVM_S390_INT_PFAULT_DONE;
+ inti.parm64 = token;
+ WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
+ }
+}
+
+bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
+ struct kvm_async_pf *work)
+{
+ trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
+ __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
+
+ return true;
+}
+
+void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
+ struct kvm_async_pf *work)
+{
+ trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
+ __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
+}
+
+void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
+ struct kvm_async_pf *work)
+{
+ /* s390 will always inject the page directly */
+}
+
+bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
+{
+ /*
+ * s390 will always inject the page directly,
+ * but we still want check_async_completion to cleanup
+ */
+ return true;
+}
+
+static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
+{
+ hva_t hva;
+ struct kvm_arch_async_pf arch;
+
+ if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
+ return false;
+ if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
+ vcpu->arch.pfault_compare)
+ return false;
+ if (psw_extint_disabled(vcpu))
+ return false;
+ if (kvm_s390_vcpu_has_irq(vcpu, 0))
+ return false;
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
+ return false;
+ if (!vcpu->arch.gmap->pfault_enabled)
+ return false;
+
+ hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
+ hva += current->thread.gmap_addr & ~PAGE_MASK;
+ if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
+ return false;
+
+ return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
+}
+
+static int vcpu_pre_run(struct kvm_vcpu *vcpu)
+{
+ int rc, cpuflags;
+
+ /*
+ * On s390 notifications for arriving pages will be delivered directly
+ * to the guest but the house keeping for completed pfaults is
+ * handled outside the worker.
+ */
+ kvm_check_async_pf_completion(vcpu);
+
+ vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
+ vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
+
+ if (need_resched())
+ schedule();
+
+ if (!kvm_is_ucontrol(vcpu->kvm)) {
+ rc = kvm_s390_deliver_pending_interrupts(vcpu);
+ if (rc)
+ return rc;
+ }
+
+ rc = kvm_s390_handle_requests(vcpu);
+ if (rc)
+ return rc;
+
+ if (guestdbg_enabled(vcpu)) {
+ kvm_s390_backup_guest_per_regs(vcpu);
+ kvm_s390_patch_guest_per_regs(vcpu);
+ }
+
+ clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
+
+ vcpu->arch.sie_block->icptcode = 0;
+ cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
+ VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
+ trace_kvm_s390_sie_enter(vcpu, cpuflags);
+
+ return 0;
+}
+
+static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_pgm_info pgm_info = {
+ .code = PGM_ADDRESSING,
+ };
+ u8 opcode, ilen;
+ int rc;
+
+ VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
+ trace_kvm_s390_sie_fault(vcpu);
+
+ /*
+ * We want to inject an addressing exception, which is defined as a
+ * suppressing or terminating exception. However, since we came here
+ * by a DAT access exception, the PSW still points to the faulting
+ * instruction since DAT exceptions are nullifying. So we've got
+ * to look up the current opcode to get the length of the instruction
+ * to be able to forward the PSW.
+ */
+ rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
+ ilen = insn_length(opcode);
+ if (rc < 0) {
+ return rc;
+ } else if (rc) {
+ /* Instruction-Fetching Exceptions - we can't detect the ilen.
+ * Forward by arbitrary ilc, injection will take care of
+ * nullification if necessary.
+ */
+ pgm_info = vcpu->arch.pgm;
+ ilen = 4;
+ }
+ pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
+ kvm_s390_forward_psw(vcpu, ilen);
+ return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
+}
+
+static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
+{
+ struct mcck_volatile_info *mcck_info;
+ struct sie_page *sie_page;
+
+ VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
+ vcpu->arch.sie_block->icptcode);
+ trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
+
+ if (guestdbg_enabled(vcpu))
+ kvm_s390_restore_guest_per_regs(vcpu);
+
+ vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
+ vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
+
+ if (exit_reason == -EINTR) {
+ VCPU_EVENT(vcpu, 3, "%s", "machine check");
+ sie_page = container_of(vcpu->arch.sie_block,
+ struct sie_page, sie_block);
+ mcck_info = &sie_page->mcck_info;
+ kvm_s390_reinject_machine_check(vcpu, mcck_info);
+ return 0;
+ }
+
+ if (vcpu->arch.sie_block->icptcode > 0) {
+ int rc = kvm_handle_sie_intercept(vcpu);
+
+ if (rc != -EOPNOTSUPP)
+ return rc;
+ vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
+ vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
+ vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
+ vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
+ return -EREMOTE;
+ } else if (exit_reason != -EFAULT) {
+ vcpu->stat.exit_null++;
+ return 0;
+ } else if (kvm_is_ucontrol(vcpu->kvm)) {
+ vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
+ vcpu->run->s390_ucontrol.trans_exc_code =
+ current->thread.gmap_addr;
+ vcpu->run->s390_ucontrol.pgm_code = 0x10;
+ return -EREMOTE;
+ } else if (current->thread.gmap_pfault) {
+ trace_kvm_s390_major_guest_pfault(vcpu);
+ current->thread.gmap_pfault = 0;
+ if (kvm_arch_setup_async_pf(vcpu))
+ return 0;
+ vcpu->stat.pfault_sync++;
+ return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
+ }
+ return vcpu_post_run_fault_in_sie(vcpu);
+}
+
+#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)
+static int __vcpu_run(struct kvm_vcpu *vcpu)
+{
+ int rc, exit_reason;
+ struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block;
+
+ /*
+ * We try to hold kvm->srcu during most of vcpu_run (except when run-
+ * ning the guest), so that memslots (and other stuff) are protected
+ */
+ kvm_vcpu_srcu_read_lock(vcpu);
+
+ do {
+ rc = vcpu_pre_run(vcpu);
+ if (rc)
+ break;
+
+ kvm_vcpu_srcu_read_unlock(vcpu);
+ /*
+ * As PF_VCPU will be used in fault handler, between
+ * guest_enter and guest_exit should be no uaccess.
+ */
+ local_irq_disable();
+ guest_enter_irqoff();
+ __disable_cpu_timer_accounting(vcpu);
+ local_irq_enable();
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ memcpy(sie_page->pv_grregs,
+ vcpu->run->s.regs.gprs,
+ sizeof(sie_page->pv_grregs));
+ }
+ if (test_cpu_flag(CIF_FPU))
+ load_fpu_regs();
+ exit_reason = sie64a(vcpu->arch.sie_block,
+ vcpu->run->s.regs.gprs);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ memcpy(vcpu->run->s.regs.gprs,
+ sie_page->pv_grregs,
+ sizeof(sie_page->pv_grregs));
+ /*
+ * We're not allowed to inject interrupts on intercepts
+ * that leave the guest state in an "in-between" state
+ * where the next SIE entry will do a continuation.
+ * Fence interrupts in our "internal" PSW.
+ */
+ if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR ||
+ vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) {
+ vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
+ }
+ }
+ local_irq_disable();
+ __enable_cpu_timer_accounting(vcpu);
+ guest_exit_irqoff();
+ local_irq_enable();
+ kvm_vcpu_srcu_read_lock(vcpu);
+
+ rc = vcpu_post_run(vcpu, exit_reason);
+ } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
+
+ kvm_vcpu_srcu_read_unlock(vcpu);
+ return rc;
+}
+
+static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *kvm_run = vcpu->run;
+ struct runtime_instr_cb *riccb;
+ struct gs_cb *gscb;
+
+ riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
+ gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
+ vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
+ vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
+ vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
+ vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
+ vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
+ }
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
+ vcpu->arch.pfault_token = kvm_run->s.regs.pft;
+ vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
+ vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
+ if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
+ kvm_clear_async_pf_completion_queue(vcpu);
+ }
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
+ vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
+ vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
+ VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc);
+ }
+ /*
+ * If userspace sets the riccb (e.g. after migration) to a valid state,
+ * we should enable RI here instead of doing the lazy enablement.
+ */
+ if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
+ test_kvm_facility(vcpu->kvm, 64) &&
+ riccb->v &&
+ !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
+ VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
+ vcpu->arch.sie_block->ecb3 |= ECB3_RI;
+ }
+ /*
+ * If userspace sets the gscb (e.g. after migration) to non-zero,
+ * we should enable GS here instead of doing the lazy enablement.
+ */
+ if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
+ test_kvm_facility(vcpu->kvm, 133) &&
+ gscb->gssm &&
+ !vcpu->arch.gs_enabled) {
+ VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
+ vcpu->arch.sie_block->ecb |= ECB_GS;
+ vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
+ vcpu->arch.gs_enabled = 1;
+ }
+ if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
+ test_kvm_facility(vcpu->kvm, 82)) {
+ vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
+ vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
+ }
+ if (MACHINE_HAS_GS) {
+ preempt_disable();
+ __ctl_set_bit(2, 4);
+ if (current->thread.gs_cb) {
+ vcpu->arch.host_gscb = current->thread.gs_cb;
+ save_gs_cb(vcpu->arch.host_gscb);
+ }
+ if (vcpu->arch.gs_enabled) {
+ current->thread.gs_cb = (struct gs_cb *)
+ &vcpu->run->s.regs.gscb;
+ restore_gs_cb(current->thread.gs_cb);
+ }
+ preempt_enable();
+ }
+ /* SIE will load etoken directly from SDNX and therefore kvm_run */
+}
+
+static void sync_regs(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *kvm_run = vcpu->run;
+
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
+ kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
+ memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
+ /* some control register changes require a tlb flush */
+ kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ }
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
+ kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
+ vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
+ }
+ save_access_regs(vcpu->arch.host_acrs);
+ restore_access_regs(vcpu->run->s.regs.acrs);
+ /* save host (userspace) fprs/vrs */
+ save_fpu_regs();
+ vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
+ vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
+ if (MACHINE_HAS_VX)
+ current->thread.fpu.regs = vcpu->run->s.regs.vrs;
+ else
+ current->thread.fpu.regs = vcpu->run->s.regs.fprs;
+ current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
+ if (test_fp_ctl(current->thread.fpu.fpc))
+ /* User space provided an invalid FPC, let's clear it */
+ current->thread.fpu.fpc = 0;
+
+ /* Sync fmt2 only data */
+ if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
+ sync_regs_fmt2(vcpu);
+ } else {
+ /*
+ * In several places we have to modify our internal view to
+ * not do things that are disallowed by the ultravisor. For
+ * example we must not inject interrupts after specific exits
+ * (e.g. 112 prefix page not secure). We do this by turning
+ * off the machine check, external and I/O interrupt bits
+ * of our PSW copy. To avoid getting validity intercepts, we
+ * do only accept the condition code from userspace.
+ */
+ vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
+ vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
+ PSW_MASK_CC;
+ }
+
+ kvm_run->kvm_dirty_regs = 0;
+}
+
+static void store_regs_fmt2(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *kvm_run = vcpu->run;
+
+ kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
+ kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
+ kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
+ kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
+ kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
+ if (MACHINE_HAS_GS) {
+ preempt_disable();
+ __ctl_set_bit(2, 4);
+ if (vcpu->arch.gs_enabled)
+ save_gs_cb(current->thread.gs_cb);
+ current->thread.gs_cb = vcpu->arch.host_gscb;
+ restore_gs_cb(vcpu->arch.host_gscb);
+ if (!vcpu->arch.host_gscb)
+ __ctl_clear_bit(2, 4);
+ vcpu->arch.host_gscb = NULL;
+ preempt_enable();
+ }
+ /* SIE will save etoken directly into SDNX and therefore kvm_run */
+}
+
+static void store_regs(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *kvm_run = vcpu->run;
+
+ kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
+ kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
+ kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
+ memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
+ kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
+ kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
+ kvm_run->s.regs.pft = vcpu->arch.pfault_token;
+ kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
+ kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
+ save_access_regs(vcpu->run->s.regs.acrs);
+ restore_access_regs(vcpu->arch.host_acrs);
+ /* Save guest register state */
+ save_fpu_regs();
+ vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
+ /* Restore will be done lazily at return */
+ current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
+ current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
+ if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
+ store_regs_fmt2(vcpu);
+}
+
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *kvm_run = vcpu->run;
+ int rc;
+
+ /*
+ * Running a VM while dumping always has the potential to
+ * produce inconsistent dump data. But for PV vcpus a SIE
+ * entry while dumping could also lead to a fatal validity
+ * intercept which we absolutely want to avoid.
+ */
+ if (vcpu->kvm->arch.pv.dumping)
+ return -EINVAL;
+
+ if (kvm_run->immediate_exit)
+ return -EINTR;
+
+ if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
+ kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
+ return -EINVAL;
+
+ vcpu_load(vcpu);
+
+ if (guestdbg_exit_pending(vcpu)) {
+ kvm_s390_prepare_debug_exit(vcpu);
+ rc = 0;
+ goto out;
+ }
+
+ kvm_sigset_activate(vcpu);
+
+ /*
+ * no need to check the return value of vcpu_start as it can only have
+ * an error for protvirt, but protvirt means user cpu state
+ */
+ if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
+ kvm_s390_vcpu_start(vcpu);
+ } else if (is_vcpu_stopped(vcpu)) {
+ pr_err_ratelimited("can't run stopped vcpu %d\n",
+ vcpu->vcpu_id);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ sync_regs(vcpu);
+ enable_cpu_timer_accounting(vcpu);
+
+ might_fault();
+ rc = __vcpu_run(vcpu);
+
+ if (signal_pending(current) && !rc) {
+ kvm_run->exit_reason = KVM_EXIT_INTR;
+ rc = -EINTR;
+ }
+
+ if (guestdbg_exit_pending(vcpu) && !rc) {
+ kvm_s390_prepare_debug_exit(vcpu);
+ rc = 0;
+ }
+
+ if (rc == -EREMOTE) {
+ /* userspace support is needed, kvm_run has been prepared */
+ rc = 0;
+ }
+
+ disable_cpu_timer_accounting(vcpu);
+ store_regs(vcpu);
+
+ kvm_sigset_deactivate(vcpu);
+
+ vcpu->stat.exit_userspace++;
+out:
+ vcpu_put(vcpu);
+ return rc;
+}
+
+/*
+ * store status at address
+ * we use have two special cases:
+ * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
+ * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
+ */
+int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
+{
+ unsigned char archmode = 1;
+ freg_t fprs[NUM_FPRS];
+ unsigned int px;
+ u64 clkcomp, cputm;
+ int rc;
+
+ px = kvm_s390_get_prefix(vcpu);
+ if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
+ if (write_guest_abs(vcpu, 163, &archmode, 1))
+ return -EFAULT;
+ gpa = 0;
+ } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
+ if (write_guest_real(vcpu, 163, &archmode, 1))
+ return -EFAULT;
+ gpa = px;
+ } else
+ gpa -= __LC_FPREGS_SAVE_AREA;
+
+ /* manually convert vector registers if necessary */
+ if (MACHINE_HAS_VX) {
+ convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
+ rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
+ fprs, 128);
+ } else {
+ rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
+ vcpu->run->s.regs.fprs, 128);
+ }
+ rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
+ vcpu->run->s.regs.gprs, 128);
+ rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
+ &vcpu->arch.sie_block->gpsw, 16);
+ rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
+ &px, 4);
+ rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
+ &vcpu->run->s.regs.fpc, 4);
+ rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
+ &vcpu->arch.sie_block->todpr, 4);
+ cputm = kvm_s390_get_cpu_timer(vcpu);
+ rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
+ &cputm, 8);
+ clkcomp = vcpu->arch.sie_block->ckc >> 8;
+ rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
+ &clkcomp, 8);
+ rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
+ &vcpu->run->s.regs.acrs, 64);
+ rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
+ &vcpu->arch.sie_block->gcr, 128);
+ return rc ? -EFAULT : 0;
+}
+
+int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
+{
+ /*
+ * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
+ * switch in the run ioctl. Let's update our copies before we save
+ * it into the save area
+ */
+ save_fpu_regs();
+ vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
+ save_access_regs(vcpu->run->s.regs.acrs);
+
+ return kvm_s390_store_status_unloaded(vcpu, addr);
+}
+
+static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
+{
+ kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
+ kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
+}
+
+static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
+{
+ unsigned long i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ __disable_ibs_on_vcpu(vcpu);
+ }
+}
+
+static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
+{
+ if (!sclp.has_ibs)
+ return;
+ kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
+ kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
+}
+
+int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
+{
+ int i, online_vcpus, r = 0, started_vcpus = 0;
+
+ if (!is_vcpu_stopped(vcpu))
+ return 0;
+
+ trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
+ /* Only one cpu at a time may enter/leave the STOPPED state. */
+ spin_lock(&vcpu->kvm->arch.start_stop_lock);
+ online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
+
+ /* Let's tell the UV that we want to change into the operating state */
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
+ if (r) {
+ spin_unlock(&vcpu->kvm->arch.start_stop_lock);
+ return r;
+ }
+ }
+
+ for (i = 0; i < online_vcpus; i++) {
+ if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i)))
+ started_vcpus++;
+ }
+
+ if (started_vcpus == 0) {
+ /* we're the only active VCPU -> speed it up */
+ __enable_ibs_on_vcpu(vcpu);
+ } else if (started_vcpus == 1) {
+ /*
+ * As we are starting a second VCPU, we have to disable
+ * the IBS facility on all VCPUs to remove potentially
+ * outstanding ENABLE requests.
+ */
+ __disable_ibs_on_all_vcpus(vcpu->kvm);
+ }
+
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
+ /*
+ * The real PSW might have changed due to a RESTART interpreted by the
+ * ultravisor. We block all interrupts and let the next sie exit
+ * refresh our view.
+ */
+ if (kvm_s390_pv_cpu_is_protected(vcpu))
+ vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
+ /*
+ * Another VCPU might have used IBS while we were offline.
+ * Let's play safe and flush the VCPU at startup.
+ */
+ kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ spin_unlock(&vcpu->kvm->arch.start_stop_lock);
+ return 0;
+}
+
+int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
+{
+ int i, online_vcpus, r = 0, started_vcpus = 0;
+ struct kvm_vcpu *started_vcpu = NULL;
+
+ if (is_vcpu_stopped(vcpu))
+ return 0;
+
+ trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
+ /* Only one cpu at a time may enter/leave the STOPPED state. */
+ spin_lock(&vcpu->kvm->arch.start_stop_lock);
+ online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
+
+ /* Let's tell the UV that we want to change into the stopped state */
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
+ if (r) {
+ spin_unlock(&vcpu->kvm->arch.start_stop_lock);
+ return r;
+ }
+ }
+
+ /*
+ * Set the VCPU to STOPPED and THEN clear the interrupt flag,
+ * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders
+ * have been fully processed. This will ensure that the VCPU
+ * is kept BUSY if another VCPU is inquiring with SIGP SENSE.
+ */
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
+ kvm_s390_clear_stop_irq(vcpu);
+
+ __disable_ibs_on_vcpu(vcpu);
+
+ for (i = 0; i < online_vcpus; i++) {
+ struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i);
+
+ if (!is_vcpu_stopped(tmp)) {
+ started_vcpus++;
+ started_vcpu = tmp;
+ }
+ }
+
+ if (started_vcpus == 1) {
+ /*
+ * As we only have one VCPU left, we want to enable the
+ * IBS facility for that VCPU to speed it up.
+ */
+ __enable_ibs_on_vcpu(started_vcpu);
+ }
+
+ spin_unlock(&vcpu->kvm->arch.start_stop_lock);
+ return 0;
+}
+
+static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
+ struct kvm_enable_cap *cap)
+{
+ int r;
+
+ if (cap->flags)
+ return -EINVAL;
+
+ switch (cap->cap) {
+ case KVM_CAP_S390_CSS_SUPPORT:
+ if (!vcpu->kvm->arch.css_support) {
+ vcpu->kvm->arch.css_support = 1;
+ VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
+ trace_kvm_s390_enable_css(vcpu->kvm);
+ }
+ r = 0;
+ break;
+ default:
+ r = -EINVAL;
+ break;
+ }
+ return r;
+}
+
+static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu,
+ struct kvm_s390_mem_op *mop)
+{
+ void __user *uaddr = (void __user *)mop->buf;
+ int r = 0;
+
+ if (mop->flags || !mop->size)
+ return -EINVAL;
+ if (mop->size + mop->sida_offset < mop->size)
+ return -EINVAL;
+ if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
+ return -E2BIG;
+ if (!kvm_s390_pv_cpu_is_protected(vcpu))
+ return -EINVAL;
+
+ switch (mop->op) {
+ case KVM_S390_MEMOP_SIDA_READ:
+ if (copy_to_user(uaddr, (void *)(sida_origin(vcpu->arch.sie_block) +
+ mop->sida_offset), mop->size))
+ r = -EFAULT;
+
+ break;
+ case KVM_S390_MEMOP_SIDA_WRITE:
+ if (copy_from_user((void *)(sida_origin(vcpu->arch.sie_block) +
+ mop->sida_offset), uaddr, mop->size))
+ r = -EFAULT;
+ break;
+ }
+ return r;
+}
+
+static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
+ struct kvm_s390_mem_op *mop)
+{
+ void __user *uaddr = (void __user *)mop->buf;
+ void *tmpbuf = NULL;
+ int r = 0;
+ const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
+ | KVM_S390_MEMOP_F_CHECK_ONLY
+ | KVM_S390_MEMOP_F_SKEY_PROTECTION;
+
+ if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size)
+ return -EINVAL;
+ if (mop->size > MEM_OP_MAX_SIZE)
+ return -E2BIG;
+ if (kvm_s390_pv_cpu_is_protected(vcpu))
+ return -EINVAL;
+ if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
+ if (access_key_invalid(mop->key))
+ return -EINVAL;
+ } else {
+ mop->key = 0;
+ }
+ if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
+ tmpbuf = vmalloc(mop->size);
+ if (!tmpbuf)
+ return -ENOMEM;
+ }
+
+ switch (mop->op) {
+ case KVM_S390_MEMOP_LOGICAL_READ:
+ if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+ r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
+ GACC_FETCH, mop->key);
+ break;
+ }
+ r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
+ mop->size, mop->key);
+ if (r == 0) {
+ if (copy_to_user(uaddr, tmpbuf, mop->size))
+ r = -EFAULT;
+ }
+ break;
+ case KVM_S390_MEMOP_LOGICAL_WRITE:
+ if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+ r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
+ GACC_STORE, mop->key);
+ break;
+ }
+ if (copy_from_user(tmpbuf, uaddr, mop->size)) {
+ r = -EFAULT;
+ break;
+ }
+ r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
+ mop->size, mop->key);
+ break;
+ }
+
+ if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
+ kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
+
+ vfree(tmpbuf);
+ return r;
+}
+
+static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu,
+ struct kvm_s390_mem_op *mop)
+{
+ int r, srcu_idx;
+
+ srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+ switch (mop->op) {
+ case KVM_S390_MEMOP_LOGICAL_READ:
+ case KVM_S390_MEMOP_LOGICAL_WRITE:
+ r = kvm_s390_vcpu_mem_op(vcpu, mop);
+ break;
+ case KVM_S390_MEMOP_SIDA_READ:
+ case KVM_S390_MEMOP_SIDA_WRITE:
+ /* we are locked against sida going away by the vcpu->mutex */
+ r = kvm_s390_vcpu_sida_op(vcpu, mop);
+ break;
+ default:
+ r = -EINVAL;
+ }
+
+ srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
+ return r;
+}
+
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+
+ switch (ioctl) {
+ case KVM_S390_IRQ: {
+ struct kvm_s390_irq s390irq;
+
+ if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
+ return -EFAULT;
+ return kvm_s390_inject_vcpu(vcpu, &s390irq);
+ }
+ case KVM_S390_INTERRUPT: {
+ struct kvm_s390_interrupt s390int;
+ struct kvm_s390_irq s390irq = {};
+
+ if (copy_from_user(&s390int, argp, sizeof(s390int)))
+ return -EFAULT;
+ if (s390int_to_s390irq(&s390int, &s390irq))
+ return -EINVAL;
+ return kvm_s390_inject_vcpu(vcpu, &s390irq);
+ }
+ }
+ return -ENOIOCTLCMD;
+}
+
+static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,
+ struct kvm_pv_cmd *cmd)
+{
+ struct kvm_s390_pv_dmp dmp;
+ void *data;
+ int ret;
+
+ /* Dump initialization is a prerequisite */
+ if (!vcpu->kvm->arch.pv.dumping)
+ return -EINVAL;
+
+ if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp)))
+ return -EFAULT;
+
+ /* We only handle this subcmd right now */
+ if (dmp.subcmd != KVM_PV_DUMP_CPU)
+ return -EINVAL;
+
+ /* CPU dump length is the same as create cpu storage donation. */
+ if (dmp.buff_len != uv_info.guest_cpu_stor_len)
+ return -EINVAL;
+
+ data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc);
+
+ VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x",
+ vcpu->vcpu_id, cmd->rc, cmd->rrc);
+
+ if (ret)
+ ret = -EINVAL;
+
+ /* On success copy over the dump data */
+ if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len))
+ ret = -EFAULT;
+
+ kvfree(data);
+ return ret;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ int idx;
+ long r;
+ u16 rc, rrc;
+
+ vcpu_load(vcpu);
+
+ switch (ioctl) {
+ case KVM_S390_STORE_STATUS:
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
+ r = kvm_s390_store_status_unloaded(vcpu, arg);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+ break;
+ case KVM_S390_SET_INITIAL_PSW: {
+ psw_t psw;
+
+ r = -EFAULT;
+ if (copy_from_user(&psw, argp, sizeof(psw)))
+ break;
+ r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
+ break;
+ }
+ case KVM_S390_CLEAR_RESET:
+ r = 0;
+ kvm_arch_vcpu_ioctl_clear_reset(vcpu);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
+ UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x",
+ rc, rrc);
+ }
+ break;
+ case KVM_S390_INITIAL_RESET:
+ r = 0;
+ kvm_arch_vcpu_ioctl_initial_reset(vcpu);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
+ UVC_CMD_CPU_RESET_INITIAL,
+ &rc, &rrc);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x",
+ rc, rrc);
+ }
+ break;
+ case KVM_S390_NORMAL_RESET:
+ r = 0;
+ kvm_arch_vcpu_ioctl_normal_reset(vcpu);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
+ UVC_CMD_CPU_RESET, &rc, &rrc);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x",
+ rc, rrc);
+ }
+ break;
+ case KVM_SET_ONE_REG:
+ case KVM_GET_ONE_REG: {
+ struct kvm_one_reg reg;
+ r = -EINVAL;
+ if (kvm_s390_pv_cpu_is_protected(vcpu))
+ break;
+ r = -EFAULT;
+ if (copy_from_user(&reg, argp, sizeof(reg)))
+ break;
+ if (ioctl == KVM_SET_ONE_REG)
+ r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
+ else
+ r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
+ break;
+ }
+#ifdef CONFIG_KVM_S390_UCONTROL
+ case KVM_S390_UCAS_MAP: {
+ struct kvm_s390_ucas_mapping ucasmap;
+
+ if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
+ r = -EFAULT;
+ break;
+ }
+
+ if (!kvm_is_ucontrol(vcpu->kvm)) {
+ r = -EINVAL;
+ break;
+ }
+
+ r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
+ ucasmap.vcpu_addr, ucasmap.length);
+ break;
+ }
+ case KVM_S390_UCAS_UNMAP: {
+ struct kvm_s390_ucas_mapping ucasmap;
+
+ if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
+ r = -EFAULT;
+ break;
+ }
+
+ if (!kvm_is_ucontrol(vcpu->kvm)) {
+ r = -EINVAL;
+ break;
+ }
+
+ r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
+ ucasmap.length);
+ break;
+ }
+#endif
+ case KVM_S390_VCPU_FAULT: {
+ r = gmap_fault(vcpu->arch.gmap, arg, 0);
+ break;
+ }
+ case KVM_ENABLE_CAP:
+ {
+ struct kvm_enable_cap cap;
+ r = -EFAULT;
+ if (copy_from_user(&cap, argp, sizeof(cap)))
+ break;
+ r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
+ break;
+ }
+ case KVM_S390_MEM_OP: {
+ struct kvm_s390_mem_op mem_op;
+
+ if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
+ r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op);
+ else
+ r = -EFAULT;
+ break;
+ }
+ case KVM_S390_SET_IRQ_STATE: {
+ struct kvm_s390_irq_state irq_state;
+
+ r = -EFAULT;
+ if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
+ break;
+ if (irq_state.len > VCPU_IRQS_MAX_BUF ||
+ irq_state.len == 0 ||
+ irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
+ r = -EINVAL;
+ break;
+ }
+ /* do not use irq_state.flags, it will break old QEMUs */
+ r = kvm_s390_set_irq_state(vcpu,
+ (void __user *) irq_state.buf,
+ irq_state.len);
+ break;
+ }
+ case KVM_S390_GET_IRQ_STATE: {
+ struct kvm_s390_irq_state irq_state;
+
+ r = -EFAULT;
+ if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
+ break;
+ if (irq_state.len == 0) {
+ r = -EINVAL;
+ break;
+ }
+ /* do not use irq_state.flags, it will break old QEMUs */
+ r = kvm_s390_get_irq_state(vcpu,
+ (__u8 __user *) irq_state.buf,
+ irq_state.len);
+ break;
+ }
+ case KVM_S390_PV_CPU_COMMAND: {
+ struct kvm_pv_cmd cmd;
+
+ r = -EINVAL;
+ if (!is_prot_virt_host())
+ break;
+
+ r = -EFAULT;
+ if (copy_from_user(&cmd, argp, sizeof(cmd)))
+ break;
+
+ r = -EINVAL;
+ if (cmd.flags)
+ break;
+
+ /* We only handle this cmd right now */
+ if (cmd.cmd != KVM_PV_DUMP)
+ break;
+
+ r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);
+
+ /* Always copy over UV rc / rrc data */
+ if (copy_to_user((__u8 __user *)argp, &cmd.rc,
+ sizeof(cmd.rc) + sizeof(cmd.rrc)))
+ r = -EFAULT;
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ }
+
+ vcpu_put(vcpu);
+ return r;
+}
+
+vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+#ifdef CONFIG_KVM_S390_UCONTROL
+ if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
+ && (kvm_is_ucontrol(vcpu->kvm))) {
+ vmf->page = virt_to_page(vcpu->arch.sie_block);
+ get_page(vmf->page);
+ return 0;
+ }
+#endif
+ return VM_FAULT_SIGBUS;
+}
+
+/* Section: memory related */
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
+{
+ gpa_t size;
+
+ /* When we are protected, we should not change the memory slots */
+ if (kvm_s390_pv_get_handle(kvm))
+ return -EINVAL;
+
+ if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) {
+ /*
+ * A few sanity checks. We can have memory slots which have to be
+ * located/ended at a segment boundary (1MB). The memory in userland is
+ * ok to be fragmented into various different vmas. It is okay to mmap()
+ * and munmap() stuff in this slot after doing this call at any time
+ */
+
+ if (new->userspace_addr & 0xffffful)
+ return -EINVAL;
+
+ size = new->npages * PAGE_SIZE;
+ if (size & 0xffffful)
+ return -EINVAL;
+
+ if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
+ return -EINVAL;
+ }
+
+ if (!kvm->arch.migration_mode)
+ return 0;
+
+ /*
+ * Turn off migration mode when:
+ * - userspace creates a new memslot with dirty logging off,
+ * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and
+ * dirty logging is turned off.
+ * Migration mode expects dirty page logging being enabled to store
+ * its dirty bitmap.
+ */
+ if (change != KVM_MR_DELETE &&
+ !(new->flags & KVM_MEM_LOG_DIRTY_PAGES))
+ WARN(kvm_s390_vm_stop_migration(kvm),
+ "Failed to stop migration mode");
+
+ return 0;
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *old,
+ const struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
+{
+ int rc = 0;
+
+ switch (change) {
+ case KVM_MR_DELETE:
+ rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
+ old->npages * PAGE_SIZE);
+ break;
+ case KVM_MR_MOVE:
+ rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
+ old->npages * PAGE_SIZE);
+ if (rc)
+ break;
+ fallthrough;
+ case KVM_MR_CREATE:
+ rc = gmap_map_segment(kvm->arch.gmap, new->userspace_addr,
+ new->base_gfn * PAGE_SIZE,
+ new->npages * PAGE_SIZE);
+ break;
+ case KVM_MR_FLAGS_ONLY:
+ break;
+ default:
+ WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
+ }
+ if (rc)
+ pr_warn("failed to commit memory region\n");
+ return;
+}
+
+static inline unsigned long nonhyp_mask(int i)
+{
+ unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
+
+ return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
+}
+
+static int __init kvm_s390_init(void)
+{
+ int i;
+
+ if (!sclp.has_sief2) {
+ pr_info("SIE is not available\n");
+ return -ENODEV;
+ }
+
+ if (nested && hpage) {
+ pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < 16; i++)
+ kvm_s390_fac_base[i] |=
+ stfle_fac_list[i] & nonhyp_mask(i);
+
+ return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+}
+
+static void __exit kvm_s390_exit(void)
+{
+ kvm_exit();
+}
+
+module_init(kvm_s390_init);
+module_exit(kvm_s390_exit);
+
+/*
+ * Enable autoloading of the kvm module.
+ * Note that we add the module alias here instead of virt/kvm/kvm_main.c
+ * since x86 takes a different approach.
+ */
+#include <linux/miscdevice.h>
+MODULE_ALIAS_MISCDEV(KVM_MINOR);
+MODULE_ALIAS("devname:kvm");