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-rw-r--r--arch/s390/kvm/interrupt.c3481
1 files changed, 3481 insertions, 0 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
new file mode 100644
index 000000000..efaebba5e
--- /dev/null
+++ b/arch/s390/kvm/interrupt.c
@@ -0,0 +1,3481 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * handling kvm guest interrupts
+ *
+ * Copyright IBM Corp. 2008, 2020
+ *
+ * Author(s): Carsten Otte <cotte@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT "kvm-s390"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/interrupt.h>
+#include <linux/kvm_host.h>
+#include <linux/hrtimer.h>
+#include <linux/mmu_context.h>
+#include <linux/nospec.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/bitmap.h>
+#include <linux/vmalloc.h>
+#include <asm/asm-offsets.h>
+#include <asm/dis.h>
+#include <linux/uaccess.h>
+#include <asm/sclp.h>
+#include <asm/isc.h>
+#include <asm/gmap.h>
+#include <asm/switch_to.h>
+#include <asm/nmi.h>
+#include <asm/airq.h>
+#include <asm/tpi.h>
+#include "kvm-s390.h"
+#include "gaccess.h"
+#include "trace-s390.h"
+#include "pci.h"
+
+#define PFAULT_INIT 0x0600
+#define PFAULT_DONE 0x0680
+#define VIRTIO_PARAM 0x0d00
+
+static struct kvm_s390_gib *gib;
+
+/* handle external calls via sigp interpretation facility */
+static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
+{
+ int c, scn;
+
+ if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
+ return 0;
+
+ BUG_ON(!kvm_s390_use_sca_entries());
+ read_lock(&vcpu->kvm->arch.sca_lock);
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
+ union esca_sigp_ctrl sigp_ctrl =
+ sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+
+ c = sigp_ctrl.c;
+ scn = sigp_ctrl.scn;
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+ union bsca_sigp_ctrl sigp_ctrl =
+ sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+
+ c = sigp_ctrl.c;
+ scn = sigp_ctrl.scn;
+ }
+ read_unlock(&vcpu->kvm->arch.sca_lock);
+
+ if (src_id)
+ *src_id = scn;
+
+ return c;
+}
+
+static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
+{
+ int expect, rc;
+
+ BUG_ON(!kvm_s390_use_sca_entries());
+ read_lock(&vcpu->kvm->arch.sca_lock);
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
+ union esca_sigp_ctrl *sigp_ctrl =
+ &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+ union esca_sigp_ctrl new_val = {0}, old_val;
+
+ old_val = READ_ONCE(*sigp_ctrl);
+ new_val.scn = src_id;
+ new_val.c = 1;
+ old_val.c = 0;
+
+ expect = old_val.value;
+ rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+ union bsca_sigp_ctrl *sigp_ctrl =
+ &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+ union bsca_sigp_ctrl new_val = {0}, old_val;
+
+ old_val = READ_ONCE(*sigp_ctrl);
+ new_val.scn = src_id;
+ new_val.c = 1;
+ old_val.c = 0;
+
+ expect = old_val.value;
+ rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
+ }
+ read_unlock(&vcpu->kvm->arch.sca_lock);
+
+ if (rc != expect) {
+ /* another external call is pending */
+ return -EBUSY;
+ }
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
+ return 0;
+}
+
+static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
+{
+ int rc, expect;
+
+ if (!kvm_s390_use_sca_entries())
+ return;
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
+ read_lock(&vcpu->kvm->arch.sca_lock);
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
+ union esca_sigp_ctrl *sigp_ctrl =
+ &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+ union esca_sigp_ctrl old;
+
+ old = READ_ONCE(*sigp_ctrl);
+ expect = old.value;
+ rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+ union bsca_sigp_ctrl *sigp_ctrl =
+ &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+ union bsca_sigp_ctrl old;
+
+ old = READ_ONCE(*sigp_ctrl);
+ expect = old.value;
+ rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
+ }
+ read_unlock(&vcpu->kvm->arch.sca_lock);
+ WARN_ON(rc != expect); /* cannot clear? */
+}
+
+int psw_extint_disabled(struct kvm_vcpu *vcpu)
+{
+ return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
+}
+
+static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
+{
+ return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
+}
+
+static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
+{
+ return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
+}
+
+static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
+{
+ return psw_extint_disabled(vcpu) &&
+ psw_ioint_disabled(vcpu) &&
+ psw_mchk_disabled(vcpu);
+}
+
+static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
+{
+ if (psw_extint_disabled(vcpu) ||
+ !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
+ return 0;
+ if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
+ /* No timer interrupts when single stepping */
+ return 0;
+ return 1;
+}
+
+static int ckc_irq_pending(struct kvm_vcpu *vcpu)
+{
+ const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
+ const u64 ckc = vcpu->arch.sie_block->ckc;
+
+ if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
+ if ((s64)ckc >= (s64)now)
+ return 0;
+ } else if (ckc >= now) {
+ return 0;
+ }
+ return ckc_interrupts_enabled(vcpu);
+}
+
+static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
+{
+ return !psw_extint_disabled(vcpu) &&
+ (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
+}
+
+static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
+{
+ if (!cpu_timer_interrupts_enabled(vcpu))
+ return 0;
+ return kvm_s390_get_cpu_timer(vcpu) >> 63;
+}
+
+static uint64_t isc_to_isc_bits(int isc)
+{
+ return (0x80 >> isc) << 24;
+}
+
+static inline u32 isc_to_int_word(u8 isc)
+{
+ return ((u32)isc << 27) | 0x80000000;
+}
+
+static inline u8 int_word_to_isc(u32 int_word)
+{
+ return (int_word & 0x38000000) >> 27;
+}
+
+/*
+ * To use atomic bitmap functions, we have to provide a bitmap address
+ * that is u64 aligned. However, the ipm might be u32 aligned.
+ * Therefore, we logically start the bitmap at the very beginning of the
+ * struct and fixup the bit number.
+ */
+#define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
+
+/**
+ * gisa_set_iam - change the GISA interruption alert mask
+ *
+ * @gisa: gisa to operate on
+ * @iam: new IAM value to use
+ *
+ * Change the IAM atomically with the next alert address and the IPM
+ * of the GISA if the GISA is not part of the GIB alert list. All three
+ * fields are located in the first long word of the GISA.
+ *
+ * Returns: 0 on success
+ * -EBUSY in case the gisa is part of the alert list
+ */
+static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
+{
+ u64 word, _word;
+
+ do {
+ word = READ_ONCE(gisa->u64.word[0]);
+ if ((u64)gisa != word >> 32)
+ return -EBUSY;
+ _word = (word & ~0xffUL) | iam;
+ } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
+
+ return 0;
+}
+
+/**
+ * gisa_clear_ipm - clear the GISA interruption pending mask
+ *
+ * @gisa: gisa to operate on
+ *
+ * Clear the IPM atomically with the next alert address and the IAM
+ * of the GISA unconditionally. All three fields are located in the
+ * first long word of the GISA.
+ */
+static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
+{
+ u64 word, _word;
+
+ do {
+ word = READ_ONCE(gisa->u64.word[0]);
+ _word = word & ~(0xffUL << 24);
+ } while (cmpxchg(&gisa->u64.word[0], word, _word) != word);
+}
+
+/**
+ * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
+ *
+ * @gi: gisa interrupt struct to work on
+ *
+ * Atomically restores the interruption alert mask if none of the
+ * relevant ISCs are pending and return the IPM.
+ *
+ * Returns: the relevant pending ISCs
+ */
+static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
+{
+ u8 pending_mask, alert_mask;
+ u64 word, _word;
+
+ do {
+ word = READ_ONCE(gi->origin->u64.word[0]);
+ alert_mask = READ_ONCE(gi->alert.mask);
+ pending_mask = (u8)(word >> 24) & alert_mask;
+ if (pending_mask)
+ return pending_mask;
+ _word = (word & ~0xffUL) | alert_mask;
+ } while (cmpxchg(&gi->origin->u64.word[0], word, _word) != word);
+
+ return 0;
+}
+
+static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+ set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
+}
+
+static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
+{
+ return READ_ONCE(gisa->ipm);
+}
+
+static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+ return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
+}
+
+static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
+{
+ unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
+ vcpu->arch.local_int.pending_irqs;
+
+ pending &= ~vcpu->kvm->arch.float_int.masked_irqs;
+ return pending;
+}
+
+static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
+ unsigned long pending_mask;
+
+ pending_mask = pending_irqs_no_gisa(vcpu);
+ if (gi->origin)
+ pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
+ return pending_mask;
+}
+
+static inline int isc_to_irq_type(unsigned long isc)
+{
+ return IRQ_PEND_IO_ISC_0 - isc;
+}
+
+static inline int irq_type_to_isc(unsigned long irq_type)
+{
+ return IRQ_PEND_IO_ISC_0 - irq_type;
+}
+
+static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
+ unsigned long active_mask)
+{
+ int i;
+
+ for (i = 0; i <= MAX_ISC; i++)
+ if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
+ active_mask &= ~(1UL << (isc_to_irq_type(i)));
+
+ return active_mask;
+}
+
+static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
+{
+ unsigned long active_mask;
+
+ active_mask = pending_irqs(vcpu);
+ if (!active_mask)
+ return 0;
+
+ if (psw_extint_disabled(vcpu))
+ active_mask &= ~IRQ_PEND_EXT_MASK;
+ if (psw_ioint_disabled(vcpu))
+ active_mask &= ~IRQ_PEND_IO_MASK;
+ else
+ active_mask = disable_iscs(vcpu, active_mask);
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
+ __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
+ __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
+ __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
+ __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
+ if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) {
+ __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
+ __clear_bit(IRQ_PEND_EXT_SERVICE_EV, &active_mask);
+ }
+ if (psw_mchk_disabled(vcpu))
+ active_mask &= ~IRQ_PEND_MCHK_MASK;
+ /* PV guest cpus can have a single interruption injected at a time. */
+ if (kvm_s390_pv_cpu_get_handle(vcpu) &&
+ vcpu->arch.sie_block->iictl != IICTL_CODE_NONE)
+ active_mask &= ~(IRQ_PEND_EXT_II_MASK |
+ IRQ_PEND_IO_MASK |
+ IRQ_PEND_MCHK_MASK);
+ /*
+ * Check both floating and local interrupt's cr14 because
+ * bit IRQ_PEND_MCHK_REP could be set in both cases.
+ */
+ if (!(vcpu->arch.sie_block->gcr[14] &
+ (vcpu->kvm->arch.float_int.mchk.cr14 |
+ vcpu->arch.local_int.irq.mchk.cr14)))
+ __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
+
+ /*
+ * STOP irqs will never be actively delivered. They are triggered via
+ * intercept requests and cleared when the stop intercept is performed.
+ */
+ __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
+
+ return active_mask;
+}
+
+static void __set_cpu_idle(struct kvm_vcpu *vcpu)
+{
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
+ set_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
+}
+
+static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
+{
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
+ clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
+}
+
+static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
+{
+ kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
+ CPUSTAT_STOP_INT);
+ vcpu->arch.sie_block->lctl = 0x0000;
+ vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
+
+ if (guestdbg_enabled(vcpu)) {
+ vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
+ LCTL_CR10 | LCTL_CR11);
+ vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
+ }
+}
+
+static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
+{
+ if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
+ return;
+ if (psw_ioint_disabled(vcpu))
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
+ else
+ vcpu->arch.sie_block->lctl |= LCTL_CR6;
+}
+
+static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
+{
+ if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
+ return;
+ if (psw_extint_disabled(vcpu))
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ else
+ vcpu->arch.sie_block->lctl |= LCTL_CR0;
+}
+
+static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
+{
+ if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_MCHK_MASK))
+ return;
+ if (psw_mchk_disabled(vcpu))
+ vcpu->arch.sie_block->ictl |= ICTL_LPSW;
+ else
+ vcpu->arch.sie_block->lctl |= LCTL_CR14;
+}
+
+static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
+{
+ if (kvm_s390_is_stop_irq_pending(vcpu))
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
+}
+
+/* Set interception request for non-deliverable interrupts */
+static void set_intercept_indicators(struct kvm_vcpu *vcpu)
+{
+ set_intercept_indicators_io(vcpu);
+ set_intercept_indicators_ext(vcpu);
+ set_intercept_indicators_mchk(vcpu);
+ set_intercept_indicators_stop(vcpu);
+}
+
+static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc = 0;
+
+ vcpu->stat.deliver_cputm++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
+ 0, 0);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
+ vcpu->arch.sie_block->eic = EXT_IRQ_CPU_TIMER;
+ } else {
+ rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
+ (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ }
+ clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc = 0;
+
+ vcpu->stat.deliver_ckc++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
+ 0, 0);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
+ vcpu->arch.sie_block->eic = EXT_IRQ_CLK_COMP;
+ } else {
+ rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
+ (u16 __user *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ }
+ clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_ext_info ext;
+ int rc;
+
+ spin_lock(&li->lock);
+ ext = li->irq.ext;
+ clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
+ li->irq.ext.ext_params2 = 0;
+ spin_unlock(&li->lock);
+
+ VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
+ ext.ext_params2);
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_INT_PFAULT_INIT,
+ 0, ext.ext_params2);
+
+ rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
+ return rc ? -EFAULT : 0;
+}
+
+static int __write_machine_check(struct kvm_vcpu *vcpu,
+ struct kvm_s390_mchk_info *mchk)
+{
+ unsigned long ext_sa_addr;
+ unsigned long lc;
+ freg_t fprs[NUM_FPRS];
+ union mci mci;
+ int rc;
+
+ /*
+ * All other possible payload for a machine check (e.g. the register
+ * contents in the save area) will be handled by the ultravisor, as
+ * the hypervisor does not not have the needed information for
+ * protected guests.
+ */
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_MCHK;
+ vcpu->arch.sie_block->mcic = mchk->mcic;
+ vcpu->arch.sie_block->faddr = mchk->failing_storage_address;
+ vcpu->arch.sie_block->edc = mchk->ext_damage_code;
+ return 0;
+ }
+
+ mci.val = mchk->mcic;
+ /* take care of lazy register loading */
+ save_fpu_regs();
+ save_access_regs(vcpu->run->s.regs.acrs);
+ if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
+ save_gs_cb(current->thread.gs_cb);
+
+ /* Extended save area */
+ rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
+ sizeof(unsigned long));
+ /* Only bits 0 through 63-LC are used for address formation */
+ lc = ext_sa_addr & MCESA_LC_MASK;
+ if (test_kvm_facility(vcpu->kvm, 133)) {
+ switch (lc) {
+ case 0:
+ case 10:
+ ext_sa_addr &= ~0x3ffUL;
+ break;
+ case 11:
+ ext_sa_addr &= ~0x7ffUL;
+ break;
+ case 12:
+ ext_sa_addr &= ~0xfffUL;
+ break;
+ default:
+ ext_sa_addr = 0;
+ break;
+ }
+ } else {
+ ext_sa_addr &= ~0x3ffUL;
+ }
+
+ if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
+ if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
+ 512))
+ mci.vr = 0;
+ } else {
+ mci.vr = 0;
+ }
+ if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
+ && (lc == 11 || lc == 12)) {
+ if (write_guest_abs(vcpu, ext_sa_addr + 1024,
+ &vcpu->run->s.regs.gscb, 32))
+ mci.gs = 0;
+ } else {
+ mci.gs = 0;
+ }
+
+ /* General interruption information */
+ rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
+ rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
+
+ /* Register-save areas */
+ if (MACHINE_HAS_VX) {
+ convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
+ rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
+ } else {
+ rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
+ vcpu->run->s.regs.fprs, 128);
+ }
+ rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
+ vcpu->run->s.regs.gprs, 128);
+ rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
+ (u32 __user *) __LC_FP_CREG_SAVE_AREA);
+ rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
+ (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
+ rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
+ (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
+ rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
+ (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
+ rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
+ &vcpu->run->s.regs.acrs, 64);
+ rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
+ &vcpu->arch.sie_block->gcr, 128);
+
+ /* Extended interruption information */
+ rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
+ (u32 __user *) __LC_EXT_DAMAGE_CODE);
+ rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
+ (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
+ sizeof(mchk->fixed_logout));
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_mchk_info mchk = {};
+ int deliver = 0;
+ int rc = 0;
+
+ spin_lock(&fi->lock);
+ spin_lock(&li->lock);
+ if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
+ test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
+ /*
+ * If there was an exigent machine check pending, then any
+ * repressible machine checks that might have been pending
+ * are indicated along with it, so always clear bits for
+ * repressible and exigent interrupts
+ */
+ mchk = li->irq.mchk;
+ clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
+ clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
+ memset(&li->irq.mchk, 0, sizeof(mchk));
+ deliver = 1;
+ }
+ /*
+ * We indicate floating repressible conditions along with
+ * other pending conditions. Channel Report Pending and Channel
+ * Subsystem damage are the only two and are indicated by
+ * bits in mcic and masked in cr14.
+ */
+ if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
+ mchk.mcic |= fi->mchk.mcic;
+ mchk.cr14 |= fi->mchk.cr14;
+ memset(&fi->mchk, 0, sizeof(mchk));
+ deliver = 1;
+ }
+ spin_unlock(&li->lock);
+ spin_unlock(&fi->lock);
+
+ if (deliver) {
+ VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
+ mchk.mcic);
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_MCHK,
+ mchk.cr14, mchk.mcic);
+ vcpu->stat.deliver_machine_check++;
+ rc = __write_machine_check(vcpu, &mchk);
+ }
+ return rc;
+}
+
+static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc = 0;
+
+ VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
+ vcpu->stat.deliver_restart_signal++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
+
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_RESTART;
+ } else {
+ rc = write_guest_lc(vcpu,
+ offsetof(struct lowcore, restart_old_psw),
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ }
+ clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_prefix_info prefix;
+
+ spin_lock(&li->lock);
+ prefix = li->irq.prefix;
+ li->irq.prefix.address = 0;
+ clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
+ spin_unlock(&li->lock);
+
+ vcpu->stat.deliver_prefix_signal++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_SIGP_SET_PREFIX,
+ prefix.address, 0);
+
+ kvm_s390_set_prefix(vcpu, prefix.address);
+ return 0;
+}
+
+static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc;
+ int cpu_addr;
+
+ spin_lock(&li->lock);
+ cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
+ clear_bit(cpu_addr, li->sigp_emerg_pending);
+ if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
+ clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
+ spin_unlock(&li->lock);
+
+ VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
+ vcpu->stat.deliver_emergency_signal++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
+ cpu_addr, 0);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
+ vcpu->arch.sie_block->eic = EXT_IRQ_EMERGENCY_SIG;
+ vcpu->arch.sie_block->extcpuaddr = cpu_addr;
+ return 0;
+ }
+
+ rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
+ (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_extcall_info extcall;
+ int rc;
+
+ spin_lock(&li->lock);
+ extcall = li->irq.extcall;
+ li->irq.extcall.code = 0;
+ clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
+ spin_unlock(&li->lock);
+
+ VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
+ vcpu->stat.deliver_external_call++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_INT_EXTERNAL_CALL,
+ extcall.code, 0);
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
+ vcpu->arch.sie_block->eic = EXT_IRQ_EXTERNAL_CALL;
+ vcpu->arch.sie_block->extcpuaddr = extcall.code;
+ return 0;
+ }
+
+ rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
+ (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ return rc ? -EFAULT : 0;
+}
+
+static int __deliver_prog_pv(struct kvm_vcpu *vcpu, u16 code)
+{
+ switch (code) {
+ case PGM_SPECIFICATION:
+ vcpu->arch.sie_block->iictl = IICTL_CODE_SPECIFICATION;
+ break;
+ case PGM_OPERAND:
+ vcpu->arch.sie_block->iictl = IICTL_CODE_OPERAND;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_pgm_info pgm_info;
+ int rc = 0, nullifying = false;
+ u16 ilen;
+
+ spin_lock(&li->lock);
+ pgm_info = li->irq.pgm;
+ clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
+ memset(&li->irq.pgm, 0, sizeof(pgm_info));
+ spin_unlock(&li->lock);
+
+ ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
+ VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
+ pgm_info.code, ilen);
+ vcpu->stat.deliver_program++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
+ pgm_info.code, 0);
+
+ /* PER is handled by the ultravisor */
+ if (kvm_s390_pv_cpu_is_protected(vcpu))
+ return __deliver_prog_pv(vcpu, pgm_info.code & ~PGM_PER);
+
+ switch (pgm_info.code & ~PGM_PER) {
+ case PGM_AFX_TRANSLATION:
+ case PGM_ASX_TRANSLATION:
+ case PGM_EX_TRANSLATION:
+ case PGM_LFX_TRANSLATION:
+ case PGM_LSTE_SEQUENCE:
+ case PGM_LSX_TRANSLATION:
+ case PGM_LX_TRANSLATION:
+ case PGM_PRIMARY_AUTHORITY:
+ case PGM_SECONDARY_AUTHORITY:
+ nullifying = true;
+ fallthrough;
+ case PGM_SPACE_SWITCH:
+ rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+ (u64 *)__LC_TRANS_EXC_CODE);
+ break;
+ case PGM_ALEN_TRANSLATION:
+ case PGM_ALE_SEQUENCE:
+ case PGM_ASTE_INSTANCE:
+ case PGM_ASTE_SEQUENCE:
+ case PGM_ASTE_VALIDITY:
+ case PGM_EXTENDED_AUTHORITY:
+ rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
+ (u8 *)__LC_EXC_ACCESS_ID);
+ nullifying = true;
+ break;
+ case PGM_ASCE_TYPE:
+ case PGM_PAGE_TRANSLATION:
+ case PGM_REGION_FIRST_TRANS:
+ case PGM_REGION_SECOND_TRANS:
+ case PGM_REGION_THIRD_TRANS:
+ case PGM_SEGMENT_TRANSLATION:
+ rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+ (u64 *)__LC_TRANS_EXC_CODE);
+ rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
+ (u8 *)__LC_EXC_ACCESS_ID);
+ rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
+ (u8 *)__LC_OP_ACCESS_ID);
+ nullifying = true;
+ break;
+ case PGM_MONITOR:
+ rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
+ (u16 *)__LC_MON_CLASS_NR);
+ rc |= put_guest_lc(vcpu, pgm_info.mon_code,
+ (u64 *)__LC_MON_CODE);
+ break;
+ case PGM_VECTOR_PROCESSING:
+ case PGM_DATA:
+ rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
+ (u32 *)__LC_DATA_EXC_CODE);
+ break;
+ case PGM_PROTECTION:
+ rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+ (u64 *)__LC_TRANS_EXC_CODE);
+ rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
+ (u8 *)__LC_EXC_ACCESS_ID);
+ break;
+ case PGM_STACK_FULL:
+ case PGM_STACK_EMPTY:
+ case PGM_STACK_SPECIFICATION:
+ case PGM_STACK_TYPE:
+ case PGM_STACK_OPERATION:
+ case PGM_TRACE_TABEL:
+ case PGM_CRYPTO_OPERATION:
+ nullifying = true;
+ break;
+ }
+
+ if (pgm_info.code & PGM_PER) {
+ rc |= put_guest_lc(vcpu, pgm_info.per_code,
+ (u8 *) __LC_PER_CODE);
+ rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
+ (u8 *)__LC_PER_ATMID);
+ rc |= put_guest_lc(vcpu, pgm_info.per_address,
+ (u64 *) __LC_PER_ADDRESS);
+ rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
+ (u8 *) __LC_PER_ACCESS_ID);
+ }
+
+ if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
+ kvm_s390_rewind_psw(vcpu, ilen);
+
+ /* bit 1+2 of the target are the ilc, so we can directly use ilen */
+ rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
+ rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
+ (u64 *) __LC_PGM_LAST_BREAK);
+ rc |= put_guest_lc(vcpu, pgm_info.code,
+ (u16 *)__LC_PGM_INT_CODE);
+ rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ return rc ? -EFAULT : 0;
+}
+
+#define SCCB_MASK 0xFFFFFFF8
+#define SCCB_EVENT_PENDING 0x3
+
+static int write_sclp(struct kvm_vcpu *vcpu, u32 parm)
+{
+ int rc;
+
+ if (kvm_s390_pv_cpu_get_handle(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
+ vcpu->arch.sie_block->eic = EXT_IRQ_SERVICE_SIG;
+ vcpu->arch.sie_block->eiparams = parm;
+ return 0;
+ }
+
+ rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+ rc |= put_guest_lc(vcpu, parm,
+ (u32 *)__LC_EXT_PARAMS);
+
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ struct kvm_s390_ext_info ext;
+
+ spin_lock(&fi->lock);
+ if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs) ||
+ !(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
+ spin_unlock(&fi->lock);
+ return 0;
+ }
+ ext = fi->srv_signal;
+ memset(&fi->srv_signal, 0, sizeof(ext));
+ clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
+ clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
+ if (kvm_s390_pv_cpu_is_protected(vcpu))
+ set_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
+ spin_unlock(&fi->lock);
+
+ VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
+ ext.ext_params);
+ vcpu->stat.deliver_service_signal++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
+ ext.ext_params, 0);
+
+ return write_sclp(vcpu, ext.ext_params);
+}
+
+static int __must_check __deliver_service_ev(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ struct kvm_s390_ext_info ext;
+
+ spin_lock(&fi->lock);
+ if (!(test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs))) {
+ spin_unlock(&fi->lock);
+ return 0;
+ }
+ ext = fi->srv_signal;
+ /* only clear the event bit */
+ fi->srv_signal.ext_params &= ~SCCB_EVENT_PENDING;
+ clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+
+ VCPU_EVENT(vcpu, 4, "%s", "deliver: sclp parameter event");
+ vcpu->stat.deliver_service_signal++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
+ ext.ext_params, 0);
+
+ return write_sclp(vcpu, SCCB_EVENT_PENDING);
+}
+
+static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ struct kvm_s390_interrupt_info *inti;
+ int rc = 0;
+
+ spin_lock(&fi->lock);
+ inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
+ struct kvm_s390_interrupt_info,
+ list);
+ if (inti) {
+ list_del(&inti->list);
+ fi->counters[FIRQ_CNTR_PFAULT] -= 1;
+ }
+ if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
+ clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+
+ if (inti) {
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_INT_PFAULT_DONE, 0,
+ inti->ext.ext_params2);
+ VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
+ inti->ext.ext_params2);
+
+ rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
+ (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, PFAULT_DONE,
+ (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
+ (u64 *)__LC_EXT_PARAMS2);
+ kfree(inti);
+ }
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+ struct kvm_s390_interrupt_info *inti;
+ int rc = 0;
+
+ spin_lock(&fi->lock);
+ inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
+ struct kvm_s390_interrupt_info,
+ list);
+ if (inti) {
+ VCPU_EVENT(vcpu, 4,
+ "deliver: virtio parm: 0x%x,parm64: 0x%llx",
+ inti->ext.ext_params, inti->ext.ext_params2);
+ vcpu->stat.deliver_virtio++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ inti->type,
+ inti->ext.ext_params,
+ inti->ext.ext_params2);
+ list_del(&inti->list);
+ fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
+ }
+ if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
+ clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+
+ if (inti) {
+ rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
+ (u16 *)__LC_EXT_INT_CODE);
+ rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
+ (u16 *)__LC_EXT_CPU_ADDR);
+ rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ rc |= put_guest_lc(vcpu, inti->ext.ext_params,
+ (u32 *)__LC_EXT_PARAMS);
+ rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
+ (u64 *)__LC_EXT_PARAMS2);
+ kfree(inti);
+ }
+ return rc ? -EFAULT : 0;
+}
+
+static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
+{
+ int rc;
+
+ if (kvm_s390_pv_cpu_is_protected(vcpu)) {
+ vcpu->arch.sie_block->iictl = IICTL_CODE_IO;
+ vcpu->arch.sie_block->subchannel_id = io->subchannel_id;
+ vcpu->arch.sie_block->subchannel_nr = io->subchannel_nr;
+ vcpu->arch.sie_block->io_int_parm = io->io_int_parm;
+ vcpu->arch.sie_block->io_int_word = io->io_int_word;
+ return 0;
+ }
+
+ rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
+ rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
+ rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
+ rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
+ rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
+ &vcpu->arch.sie_block->gpsw,
+ sizeof(psw_t));
+ return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
+ unsigned long irq_type)
+{
+ struct list_head *isc_list;
+ struct kvm_s390_float_interrupt *fi;
+ struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
+ struct kvm_s390_interrupt_info *inti = NULL;
+ struct kvm_s390_io_info io;
+ u32 isc;
+ int rc = 0;
+
+ fi = &vcpu->kvm->arch.float_int;
+
+ spin_lock(&fi->lock);
+ isc = irq_type_to_isc(irq_type);
+ isc_list = &fi->lists[isc];
+ inti = list_first_entry_or_null(isc_list,
+ struct kvm_s390_interrupt_info,
+ list);
+ if (inti) {
+ if (inti->type & KVM_S390_INT_IO_AI_MASK)
+ VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
+ else
+ VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
+ inti->io.subchannel_id >> 8,
+ inti->io.subchannel_id >> 1 & 0x3,
+ inti->io.subchannel_nr);
+
+ vcpu->stat.deliver_io++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ inti->type,
+ ((__u32)inti->io.subchannel_id << 16) |
+ inti->io.subchannel_nr,
+ ((__u64)inti->io.io_int_parm << 32) |
+ inti->io.io_int_word);
+ list_del(&inti->list);
+ fi->counters[FIRQ_CNTR_IO] -= 1;
+ }
+ if (list_empty(isc_list))
+ clear_bit(irq_type, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+
+ if (inti) {
+ rc = __do_deliver_io(vcpu, &(inti->io));
+ kfree(inti);
+ goto out;
+ }
+
+ if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
+ /*
+ * in case an adapter interrupt was not delivered
+ * in SIE context KVM will handle the delivery
+ */
+ VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
+ memset(&io, 0, sizeof(io));
+ io.io_int_word = isc_to_int_word(isc);
+ vcpu->stat.deliver_io++;
+ trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+ KVM_S390_INT_IO(1, 0, 0, 0),
+ ((__u32)io.subchannel_id << 16) |
+ io.subchannel_nr,
+ ((__u64)io.io_int_parm << 32) |
+ io.io_int_word);
+ rc = __do_deliver_io(vcpu, &io);
+ }
+out:
+ return rc;
+}
+
+/* Check whether an external call is pending (deliverable or not) */
+int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ if (!sclp.has_sigpif)
+ return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
+
+ return sca_ext_call_pending(vcpu, NULL);
+}
+
+int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
+{
+ if (deliverable_irqs(vcpu))
+ return 1;
+
+ if (kvm_cpu_has_pending_timer(vcpu))
+ return 1;
+
+ /* external call pending and deliverable */
+ if (kvm_s390_ext_call_pending(vcpu) &&
+ !psw_extint_disabled(vcpu) &&
+ (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
+ return 1;
+
+ if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
+ return 1;
+ return 0;
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
+}
+
+static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
+{
+ const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
+ const u64 ckc = vcpu->arch.sie_block->ckc;
+ u64 cputm, sltime = 0;
+
+ if (ckc_interrupts_enabled(vcpu)) {
+ if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
+ if ((s64)now < (s64)ckc)
+ sltime = tod_to_ns((s64)ckc - (s64)now);
+ } else if (now < ckc) {
+ sltime = tod_to_ns(ckc - now);
+ }
+ /* already expired */
+ if (!sltime)
+ return 0;
+ if (cpu_timer_interrupts_enabled(vcpu)) {
+ cputm = kvm_s390_get_cpu_timer(vcpu);
+ /* already expired? */
+ if (cputm >> 63)
+ return 0;
+ return min_t(u64, sltime, tod_to_ns(cputm));
+ }
+ } else if (cpu_timer_interrupts_enabled(vcpu)) {
+ sltime = kvm_s390_get_cpu_timer(vcpu);
+ /* already expired? */
+ if (sltime >> 63)
+ return 0;
+ }
+ return sltime;
+}
+
+int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
+ u64 sltime;
+
+ vcpu->stat.exit_wait_state++;
+
+ /* fast path */
+ if (kvm_arch_vcpu_runnable(vcpu))
+ return 0;
+
+ if (psw_interrupts_disabled(vcpu)) {
+ VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
+ return -EOPNOTSUPP; /* disabled wait */
+ }
+
+ if (gi->origin &&
+ (gisa_get_ipm_or_restore_iam(gi) &
+ vcpu->arch.sie_block->gcr[6] >> 24))
+ return 0;
+
+ if (!ckc_interrupts_enabled(vcpu) &&
+ !cpu_timer_interrupts_enabled(vcpu)) {
+ VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
+ __set_cpu_idle(vcpu);
+ goto no_timer;
+ }
+
+ sltime = __calculate_sltime(vcpu);
+ if (!sltime)
+ return 0;
+
+ __set_cpu_idle(vcpu);
+ hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
+ VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
+no_timer:
+ kvm_vcpu_srcu_read_unlock(vcpu);
+ kvm_vcpu_halt(vcpu);
+ vcpu->valid_wakeup = false;
+ __unset_cpu_idle(vcpu);
+ kvm_vcpu_srcu_read_lock(vcpu);
+
+ hrtimer_cancel(&vcpu->arch.ckc_timer);
+ return 0;
+}
+
+void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
+{
+ vcpu->valid_wakeup = true;
+ kvm_vcpu_wake_up(vcpu);
+
+ /*
+ * The VCPU might not be sleeping but rather executing VSIE. Let's
+ * kick it, so it leaves the SIE to process the request.
+ */
+ kvm_s390_vsie_kick(vcpu);
+}
+
+enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
+{
+ struct kvm_vcpu *vcpu;
+ u64 sltime;
+
+ vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
+ sltime = __calculate_sltime(vcpu);
+
+ /*
+ * If the monotonic clock runs faster than the tod clock we might be
+ * woken up too early and have to go back to sleep to avoid deadlocks.
+ */
+ if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
+ return HRTIMER_RESTART;
+ kvm_s390_vcpu_wakeup(vcpu);
+ return HRTIMER_NORESTART;
+}
+
+void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ spin_lock(&li->lock);
+ li->pending_irqs = 0;
+ bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
+ memset(&li->irq, 0, sizeof(li->irq));
+ spin_unlock(&li->lock);
+
+ sca_clear_ext_call(vcpu);
+}
+
+int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc = 0;
+ bool delivered = false;
+ unsigned long irq_type;
+ unsigned long irqs;
+
+ __reset_intercept_indicators(vcpu);
+
+ /* pending ckc conditions might have been invalidated */
+ clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+ if (ckc_irq_pending(vcpu))
+ set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+
+ /* pending cpu timer conditions might have been invalidated */
+ clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+ if (cpu_timer_irq_pending(vcpu))
+ set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+
+ while ((irqs = deliverable_irqs(vcpu)) && !rc) {
+ /* bits are in the reverse order of interrupt priority */
+ irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
+ switch (irq_type) {
+ case IRQ_PEND_IO_ISC_0:
+ case IRQ_PEND_IO_ISC_1:
+ case IRQ_PEND_IO_ISC_2:
+ case IRQ_PEND_IO_ISC_3:
+ case IRQ_PEND_IO_ISC_4:
+ case IRQ_PEND_IO_ISC_5:
+ case IRQ_PEND_IO_ISC_6:
+ case IRQ_PEND_IO_ISC_7:
+ rc = __deliver_io(vcpu, irq_type);
+ break;
+ case IRQ_PEND_MCHK_EX:
+ case IRQ_PEND_MCHK_REP:
+ rc = __deliver_machine_check(vcpu);
+ break;
+ case IRQ_PEND_PROG:
+ rc = __deliver_prog(vcpu);
+ break;
+ case IRQ_PEND_EXT_EMERGENCY:
+ rc = __deliver_emergency_signal(vcpu);
+ break;
+ case IRQ_PEND_EXT_EXTERNAL:
+ rc = __deliver_external_call(vcpu);
+ break;
+ case IRQ_PEND_EXT_CLOCK_COMP:
+ rc = __deliver_ckc(vcpu);
+ break;
+ case IRQ_PEND_EXT_CPU_TIMER:
+ rc = __deliver_cpu_timer(vcpu);
+ break;
+ case IRQ_PEND_RESTART:
+ rc = __deliver_restart(vcpu);
+ break;
+ case IRQ_PEND_SET_PREFIX:
+ rc = __deliver_set_prefix(vcpu);
+ break;
+ case IRQ_PEND_PFAULT_INIT:
+ rc = __deliver_pfault_init(vcpu);
+ break;
+ case IRQ_PEND_EXT_SERVICE:
+ rc = __deliver_service(vcpu);
+ break;
+ case IRQ_PEND_EXT_SERVICE_EV:
+ rc = __deliver_service_ev(vcpu);
+ break;
+ case IRQ_PEND_PFAULT_DONE:
+ rc = __deliver_pfault_done(vcpu);
+ break;
+ case IRQ_PEND_VIRTIO:
+ rc = __deliver_virtio(vcpu);
+ break;
+ default:
+ WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
+ clear_bit(irq_type, &li->pending_irqs);
+ }
+ delivered |= !rc;
+ }
+
+ /*
+ * We delivered at least one interrupt and modified the PC. Force a
+ * singlestep event now.
+ */
+ if (delivered && guestdbg_sstep_enabled(vcpu)) {
+ struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch;
+
+ debug_exit->addr = vcpu->arch.sie_block->gpsw.addr;
+ debug_exit->type = KVM_SINGLESTEP;
+ vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
+ }
+
+ set_intercept_indicators(vcpu);
+
+ return rc;
+}
+
+static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_program++;
+ VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
+ irq->u.pgm.code, 0);
+
+ if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
+ /* auto detection if no valid ILC was given */
+ irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
+ irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
+ irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
+ }
+
+ if (irq->u.pgm.code == PGM_PER) {
+ li->irq.pgm.code |= PGM_PER;
+ li->irq.pgm.flags = irq->u.pgm.flags;
+ /* only modify PER related information */
+ li->irq.pgm.per_address = irq->u.pgm.per_address;
+ li->irq.pgm.per_code = irq->u.pgm.per_code;
+ li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
+ li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
+ } else if (!(irq->u.pgm.code & PGM_PER)) {
+ li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
+ irq->u.pgm.code;
+ li->irq.pgm.flags = irq->u.pgm.flags;
+ /* only modify non-PER information */
+ li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
+ li->irq.pgm.mon_code = irq->u.pgm.mon_code;
+ li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
+ li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
+ li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
+ li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
+ } else {
+ li->irq.pgm = irq->u.pgm;
+ }
+ set_bit(IRQ_PEND_PROG, &li->pending_irqs);
+ return 0;
+}
+
+static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_pfault_init++;
+ VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
+ irq->u.ext.ext_params2);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
+ irq->u.ext.ext_params,
+ irq->u.ext.ext_params2);
+
+ li->irq.ext = irq->u.ext;
+ set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ return 0;
+}
+
+static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
+ uint16_t src_id = irq->u.extcall.code;
+
+ vcpu->stat.inject_external_call++;
+ VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
+ src_id);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
+ src_id, 0);
+
+ /* sending vcpu invalid */
+ if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
+ return -EINVAL;
+
+ if (sclp.has_sigpif && !kvm_s390_pv_cpu_get_handle(vcpu))
+ return sca_inject_ext_call(vcpu, src_id);
+
+ if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
+ return -EBUSY;
+ *extcall = irq->u.extcall;
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ return 0;
+}
+
+static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
+
+ vcpu->stat.inject_set_prefix++;
+ VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
+ irq->u.prefix.address);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
+ irq->u.prefix.address, 0);
+
+ if (!is_vcpu_stopped(vcpu))
+ return -EBUSY;
+
+ *prefix = irq->u.prefix;
+ set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
+ return 0;
+}
+
+#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
+static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_stop_info *stop = &li->irq.stop;
+ int rc = 0;
+
+ vcpu->stat.inject_stop_signal++;
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
+
+ if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
+ return -EINVAL;
+
+ if (is_vcpu_stopped(vcpu)) {
+ if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
+ rc = kvm_s390_store_status_unloaded(vcpu,
+ KVM_S390_STORE_STATUS_NOADDR);
+ return rc;
+ }
+
+ if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
+ return -EBUSY;
+ stop->flags = irq->u.stop.flags;
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
+ return 0;
+}
+
+static int __inject_sigp_restart(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_restart++;
+ VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
+
+ set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+ return 0;
+}
+
+static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
+ struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_emergency_signal++;
+ VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
+ irq->u.emerg.code);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
+ irq->u.emerg.code, 0);
+
+ /* sending vcpu invalid */
+ if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
+ return -EINVAL;
+
+ set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
+ set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ return 0;
+}
+
+static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
+
+ vcpu->stat.inject_mchk++;
+ VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
+ irq->u.mchk.mcic);
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
+ irq->u.mchk.mcic);
+
+ /*
+ * Because repressible machine checks can be indicated along with
+ * exigent machine checks (PoP, Chapter 11, Interruption action)
+ * we need to combine cr14, mcic and external damage code.
+ * Failing storage address and the logout area should not be or'ed
+ * together, we just indicate the last occurrence of the corresponding
+ * machine check
+ */
+ mchk->cr14 |= irq->u.mchk.cr14;
+ mchk->mcic |= irq->u.mchk.mcic;
+ mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
+ mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
+ memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
+ sizeof(mchk->fixed_logout));
+ if (mchk->mcic & MCHK_EX_MASK)
+ set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
+ else if (mchk->mcic & MCHK_REP_MASK)
+ set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
+ return 0;
+}
+
+static int __inject_ckc(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_ckc++;
+ VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
+ 0, 0);
+
+ set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ return 0;
+}
+
+static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ vcpu->stat.inject_cputm++;
+ VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
+ trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
+ 0, 0);
+
+ set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+ kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+ return 0;
+}
+
+static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
+ int isc, u32 schid)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
+ struct kvm_s390_interrupt_info *iter;
+ u16 id = (schid & 0xffff0000U) >> 16;
+ u16 nr = schid & 0x0000ffffU;
+
+ spin_lock(&fi->lock);
+ list_for_each_entry(iter, isc_list, list) {
+ if (schid && (id != iter->io.subchannel_id ||
+ nr != iter->io.subchannel_nr))
+ continue;
+ /* found an appropriate entry */
+ list_del_init(&iter->list);
+ fi->counters[FIRQ_CNTR_IO] -= 1;
+ if (list_empty(isc_list))
+ clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+ return iter;
+ }
+ spin_unlock(&fi->lock);
+ return NULL;
+}
+
+static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
+ u64 isc_mask, u32 schid)
+{
+ struct kvm_s390_interrupt_info *inti = NULL;
+ int isc;
+
+ for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
+ if (isc_mask & isc_to_isc_bits(isc))
+ inti = get_io_int(kvm, isc, schid);
+ }
+ return inti;
+}
+
+static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ unsigned long active_mask;
+ int isc;
+
+ if (schid)
+ goto out;
+ if (!gi->origin)
+ goto out;
+
+ active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
+ while (active_mask) {
+ isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
+ if (gisa_tac_ipm_gisc(gi->origin, isc))
+ return isc;
+ clear_bit_inv(isc, &active_mask);
+ }
+out:
+ return -EINVAL;
+}
+
+/*
+ * Dequeue and return an I/O interrupt matching any of the interruption
+ * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
+ * Take into account the interrupts pending in the interrupt list and in GISA.
+ *
+ * Note that for a guest that does not enable I/O interrupts
+ * but relies on TPI, a flood of classic interrupts may starve
+ * out adapter interrupts on the same isc. Linux does not do
+ * that, and it is possible to work around the issue by configuring
+ * different iscs for classic and adapter interrupts in the guest,
+ * but we may want to revisit this in the future.
+ */
+struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
+ u64 isc_mask, u32 schid)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_s390_interrupt_info *inti, *tmp_inti;
+ int isc;
+
+ inti = get_top_io_int(kvm, isc_mask, schid);
+
+ isc = get_top_gisa_isc(kvm, isc_mask, schid);
+ if (isc < 0)
+ /* no AI in GISA */
+ goto out;
+
+ if (!inti)
+ /* AI in GISA but no classical IO int */
+ goto gisa_out;
+
+ /* both types of interrupts present */
+ if (int_word_to_isc(inti->io.io_int_word) <= isc) {
+ /* classical IO int with higher priority */
+ gisa_set_ipm_gisc(gi->origin, isc);
+ goto out;
+ }
+gisa_out:
+ tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
+ if (tmp_inti) {
+ tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
+ tmp_inti->io.io_int_word = isc_to_int_word(isc);
+ if (inti)
+ kvm_s390_reinject_io_int(kvm, inti);
+ inti = tmp_inti;
+ } else
+ gisa_set_ipm_gisc(gi->origin, isc);
+out:
+ return inti;
+}
+
+static int __inject_service(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+ kvm->stat.inject_service_signal++;
+ spin_lock(&fi->lock);
+ fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
+
+ /* We always allow events, track them separately from the sccb ints */
+ if (fi->srv_signal.ext_params & SCCB_EVENT_PENDING)
+ set_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
+
+ /*
+ * Early versions of the QEMU s390 bios will inject several
+ * service interrupts after another without handling a
+ * condition code indicating busy.
+ * We will silently ignore those superfluous sccb values.
+ * A future version of QEMU will take care of serialization
+ * of servc requests
+ */
+ if (fi->srv_signal.ext_params & SCCB_MASK)
+ goto out;
+ fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
+ set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
+out:
+ spin_unlock(&fi->lock);
+ kfree(inti);
+ return 0;
+}
+
+static int __inject_virtio(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+ kvm->stat.inject_virtio++;
+ spin_lock(&fi->lock);
+ if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
+ spin_unlock(&fi->lock);
+ return -EBUSY;
+ }
+ fi->counters[FIRQ_CNTR_VIRTIO] += 1;
+ list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
+ set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+ return 0;
+}
+
+static int __inject_pfault_done(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+ kvm->stat.inject_pfault_done++;
+ spin_lock(&fi->lock);
+ if (fi->counters[FIRQ_CNTR_PFAULT] >=
+ (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
+ spin_unlock(&fi->lock);
+ return -EBUSY;
+ }
+ fi->counters[FIRQ_CNTR_PFAULT] += 1;
+ list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
+ set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+ return 0;
+}
+
+#define CR_PENDING_SUBCLASS 28
+static int __inject_float_mchk(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+ kvm->stat.inject_float_mchk++;
+ spin_lock(&fi->lock);
+ fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
+ fi->mchk.mcic |= inti->mchk.mcic;
+ set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+ kfree(inti);
+ return 0;
+}
+
+static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_s390_float_interrupt *fi;
+ struct list_head *list;
+ int isc;
+
+ kvm->stat.inject_io++;
+ isc = int_word_to_isc(inti->io.io_int_word);
+
+ /*
+ * We do not use the lock checking variant as this is just a
+ * performance optimization and we do not hold the lock here.
+ * This is ok as the code will pick interrupts from both "lists"
+ * for delivery.
+ */
+ if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
+ VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
+ gisa_set_ipm_gisc(gi->origin, isc);
+ kfree(inti);
+ return 0;
+ }
+
+ fi = &kvm->arch.float_int;
+ spin_lock(&fi->lock);
+ if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
+ spin_unlock(&fi->lock);
+ return -EBUSY;
+ }
+ fi->counters[FIRQ_CNTR_IO] += 1;
+
+ if (inti->type & KVM_S390_INT_IO_AI_MASK)
+ VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
+ else
+ VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
+ inti->io.subchannel_id >> 8,
+ inti->io.subchannel_id >> 1 & 0x3,
+ inti->io.subchannel_nr);
+ list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
+ list_add_tail(&inti->list, list);
+ set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
+ spin_unlock(&fi->lock);
+ return 0;
+}
+
+/*
+ * Find a destination VCPU for a floating irq and kick it.
+ */
+static void __floating_irq_kick(struct kvm *kvm, u64 type)
+{
+ struct kvm_vcpu *dst_vcpu;
+ int sigcpu, online_vcpus, nr_tries = 0;
+
+ online_vcpus = atomic_read(&kvm->online_vcpus);
+ if (!online_vcpus)
+ return;
+
+ /* find idle VCPUs first, then round robin */
+ sigcpu = find_first_bit(kvm->arch.idle_mask, online_vcpus);
+ if (sigcpu == online_vcpus) {
+ do {
+ sigcpu = kvm->arch.float_int.next_rr_cpu++;
+ kvm->arch.float_int.next_rr_cpu %= online_vcpus;
+ /* avoid endless loops if all vcpus are stopped */
+ if (nr_tries++ >= online_vcpus)
+ return;
+ } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
+ }
+ dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
+
+ /* make the VCPU drop out of the SIE, or wake it up if sleeping */
+ switch (type) {
+ case KVM_S390_MCHK:
+ kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
+ break;
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ if (!(type & KVM_S390_INT_IO_AI_MASK &&
+ kvm->arch.gisa_int.origin) ||
+ kvm_s390_pv_cpu_get_handle(dst_vcpu))
+ kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
+ break;
+ default:
+ kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
+ break;
+ }
+ kvm_s390_vcpu_wakeup(dst_vcpu);
+}
+
+static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
+{
+ u64 type = READ_ONCE(inti->type);
+ int rc;
+
+ switch (type) {
+ case KVM_S390_MCHK:
+ rc = __inject_float_mchk(kvm, inti);
+ break;
+ case KVM_S390_INT_VIRTIO:
+ rc = __inject_virtio(kvm, inti);
+ break;
+ case KVM_S390_INT_SERVICE:
+ rc = __inject_service(kvm, inti);
+ break;
+ case KVM_S390_INT_PFAULT_DONE:
+ rc = __inject_pfault_done(kvm, inti);
+ break;
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ rc = __inject_io(kvm, inti);
+ break;
+ default:
+ rc = -EINVAL;
+ }
+ if (rc)
+ return rc;
+
+ __floating_irq_kick(kvm, type);
+ return 0;
+}
+
+int kvm_s390_inject_vm(struct kvm *kvm,
+ struct kvm_s390_interrupt *s390int)
+{
+ struct kvm_s390_interrupt_info *inti;
+ int rc;
+
+ inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
+ if (!inti)
+ return -ENOMEM;
+
+ inti->type = s390int->type;
+ switch (inti->type) {
+ case KVM_S390_INT_VIRTIO:
+ VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
+ s390int->parm, s390int->parm64);
+ inti->ext.ext_params = s390int->parm;
+ inti->ext.ext_params2 = s390int->parm64;
+ break;
+ case KVM_S390_INT_SERVICE:
+ VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
+ inti->ext.ext_params = s390int->parm;
+ break;
+ case KVM_S390_INT_PFAULT_DONE:
+ inti->ext.ext_params2 = s390int->parm64;
+ break;
+ case KVM_S390_MCHK:
+ VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
+ s390int->parm64);
+ inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
+ inti->mchk.mcic = s390int->parm64;
+ break;
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ inti->io.subchannel_id = s390int->parm >> 16;
+ inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
+ inti->io.io_int_parm = s390int->parm64 >> 32;
+ inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
+ break;
+ default:
+ kfree(inti);
+ return -EINVAL;
+ }
+ trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
+ 2);
+
+ rc = __inject_vm(kvm, inti);
+ if (rc)
+ kfree(inti);
+ return rc;
+}
+
+int kvm_s390_reinject_io_int(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ return __inject_vm(kvm, inti);
+}
+
+int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
+ struct kvm_s390_irq *irq)
+{
+ irq->type = s390int->type;
+ switch (irq->type) {
+ case KVM_S390_PROGRAM_INT:
+ if (s390int->parm & 0xffff0000)
+ return -EINVAL;
+ irq->u.pgm.code = s390int->parm;
+ break;
+ case KVM_S390_SIGP_SET_PREFIX:
+ irq->u.prefix.address = s390int->parm;
+ break;
+ case KVM_S390_SIGP_STOP:
+ irq->u.stop.flags = s390int->parm;
+ break;
+ case KVM_S390_INT_EXTERNAL_CALL:
+ if (s390int->parm & 0xffff0000)
+ return -EINVAL;
+ irq->u.extcall.code = s390int->parm;
+ break;
+ case KVM_S390_INT_EMERGENCY:
+ if (s390int->parm & 0xffff0000)
+ return -EINVAL;
+ irq->u.emerg.code = s390int->parm;
+ break;
+ case KVM_S390_MCHK:
+ irq->u.mchk.mcic = s390int->parm64;
+ break;
+ case KVM_S390_INT_PFAULT_INIT:
+ irq->u.ext.ext_params = s390int->parm;
+ irq->u.ext.ext_params2 = s390int->parm64;
+ break;
+ case KVM_S390_RESTART:
+ case KVM_S390_INT_CLOCK_COMP:
+ case KVM_S390_INT_CPU_TIMER:
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
+}
+
+int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ return test_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+}
+
+void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+ spin_lock(&li->lock);
+ li->irq.stop.flags = 0;
+ clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
+ spin_unlock(&li->lock);
+}
+
+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ int rc;
+
+ switch (irq->type) {
+ case KVM_S390_PROGRAM_INT:
+ rc = __inject_prog(vcpu, irq);
+ break;
+ case KVM_S390_SIGP_SET_PREFIX:
+ rc = __inject_set_prefix(vcpu, irq);
+ break;
+ case KVM_S390_SIGP_STOP:
+ rc = __inject_sigp_stop(vcpu, irq);
+ break;
+ case KVM_S390_RESTART:
+ rc = __inject_sigp_restart(vcpu);
+ break;
+ case KVM_S390_INT_CLOCK_COMP:
+ rc = __inject_ckc(vcpu);
+ break;
+ case KVM_S390_INT_CPU_TIMER:
+ rc = __inject_cpu_timer(vcpu);
+ break;
+ case KVM_S390_INT_EXTERNAL_CALL:
+ rc = __inject_extcall(vcpu, irq);
+ break;
+ case KVM_S390_INT_EMERGENCY:
+ rc = __inject_sigp_emergency(vcpu, irq);
+ break;
+ case KVM_S390_MCHK:
+ rc = __inject_mchk(vcpu, irq);
+ break;
+ case KVM_S390_INT_PFAULT_INIT:
+ rc = __inject_pfault_init(vcpu, irq);
+ break;
+ case KVM_S390_INT_VIRTIO:
+ case KVM_S390_INT_SERVICE:
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ default:
+ rc = -EINVAL;
+ }
+
+ return rc;
+}
+
+int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ int rc;
+
+ spin_lock(&li->lock);
+ rc = do_inject_vcpu(vcpu, irq);
+ spin_unlock(&li->lock);
+ if (!rc)
+ kvm_s390_vcpu_wakeup(vcpu);
+ return rc;
+}
+
+static inline void clear_irq_list(struct list_head *_list)
+{
+ struct kvm_s390_interrupt_info *inti, *n;
+
+ list_for_each_entry_safe(inti, n, _list, list) {
+ list_del(&inti->list);
+ kfree(inti);
+ }
+}
+
+static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
+ struct kvm_s390_irq *irq)
+{
+ irq->type = inti->type;
+ switch (inti->type) {
+ case KVM_S390_INT_PFAULT_INIT:
+ case KVM_S390_INT_PFAULT_DONE:
+ case KVM_S390_INT_VIRTIO:
+ irq->u.ext = inti->ext;
+ break;
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ irq->u.io = inti->io;
+ break;
+ }
+}
+
+void kvm_s390_clear_float_irqs(struct kvm *kvm)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ int i;
+
+ mutex_lock(&kvm->lock);
+ if (!kvm_s390_pv_is_protected(kvm))
+ fi->masked_irqs = 0;
+ mutex_unlock(&kvm->lock);
+ spin_lock(&fi->lock);
+ fi->pending_irqs = 0;
+ memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
+ memset(&fi->mchk, 0, sizeof(fi->mchk));
+ for (i = 0; i < FIRQ_LIST_COUNT; i++)
+ clear_irq_list(&fi->lists[i]);
+ for (i = 0; i < FIRQ_MAX_COUNT; i++)
+ fi->counters[i] = 0;
+ spin_unlock(&fi->lock);
+ kvm_s390_gisa_clear(kvm);
+};
+
+static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_s390_interrupt_info *inti;
+ struct kvm_s390_float_interrupt *fi;
+ struct kvm_s390_irq *buf;
+ struct kvm_s390_irq *irq;
+ int max_irqs;
+ int ret = 0;
+ int n = 0;
+ int i;
+
+ if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
+ return -EINVAL;
+
+ /*
+ * We are already using -ENOMEM to signal
+ * userspace it may retry with a bigger buffer,
+ * so we need to use something else for this case
+ */
+ buf = vzalloc(len);
+ if (!buf)
+ return -ENOBUFS;
+
+ max_irqs = len / sizeof(struct kvm_s390_irq);
+
+ if (gi->origin && gisa_get_ipm(gi->origin)) {
+ for (i = 0; i <= MAX_ISC; i++) {
+ if (n == max_irqs) {
+ /* signal userspace to try again */
+ ret = -ENOMEM;
+ goto out_nolock;
+ }
+ if (gisa_tac_ipm_gisc(gi->origin, i)) {
+ irq = (struct kvm_s390_irq *) &buf[n];
+ irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
+ irq->u.io.io_int_word = isc_to_int_word(i);
+ n++;
+ }
+ }
+ }
+ fi = &kvm->arch.float_int;
+ spin_lock(&fi->lock);
+ for (i = 0; i < FIRQ_LIST_COUNT; i++) {
+ list_for_each_entry(inti, &fi->lists[i], list) {
+ if (n == max_irqs) {
+ /* signal userspace to try again */
+ ret = -ENOMEM;
+ goto out;
+ }
+ inti_to_irq(inti, &buf[n]);
+ n++;
+ }
+ }
+ if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs) ||
+ test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs)) {
+ if (n == max_irqs) {
+ /* signal userspace to try again */
+ ret = -ENOMEM;
+ goto out;
+ }
+ irq = (struct kvm_s390_irq *) &buf[n];
+ irq->type = KVM_S390_INT_SERVICE;
+ irq->u.ext = fi->srv_signal;
+ n++;
+ }
+ if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
+ if (n == max_irqs) {
+ /* signal userspace to try again */
+ ret = -ENOMEM;
+ goto out;
+ }
+ irq = (struct kvm_s390_irq *) &buf[n];
+ irq->type = KVM_S390_MCHK;
+ irq->u.mchk = fi->mchk;
+ n++;
+}
+
+out:
+ spin_unlock(&fi->lock);
+out_nolock:
+ if (!ret && n > 0) {
+ if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
+ ret = -EFAULT;
+ }
+ vfree(buf);
+
+ return ret < 0 ? ret : n;
+}
+
+static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_ais_all ais;
+
+ if (attr->attr < sizeof(ais))
+ return -EINVAL;
+
+ if (!test_kvm_facility(kvm, 72))
+ return -EOPNOTSUPP;
+
+ mutex_lock(&fi->ais_lock);
+ ais.simm = fi->simm;
+ ais.nimm = fi->nimm;
+ mutex_unlock(&fi->ais_lock);
+
+ if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ int r;
+
+ switch (attr->group) {
+ case KVM_DEV_FLIC_GET_ALL_IRQS:
+ r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
+ attr->attr);
+ break;
+ case KVM_DEV_FLIC_AISM_ALL:
+ r = flic_ais_mode_get_all(dev->kvm, attr);
+ break;
+ default:
+ r = -EINVAL;
+ }
+
+ return r;
+}
+
+static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
+ u64 addr)
+{
+ struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
+ void *target = NULL;
+ void __user *source;
+ u64 size;
+
+ if (get_user(inti->type, (u64 __user *)addr))
+ return -EFAULT;
+
+ switch (inti->type) {
+ case KVM_S390_INT_PFAULT_INIT:
+ case KVM_S390_INT_PFAULT_DONE:
+ case KVM_S390_INT_VIRTIO:
+ case KVM_S390_INT_SERVICE:
+ target = (void *) &inti->ext;
+ source = &uptr->u.ext;
+ size = sizeof(inti->ext);
+ break;
+ case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+ target = (void *) &inti->io;
+ source = &uptr->u.io;
+ size = sizeof(inti->io);
+ break;
+ case KVM_S390_MCHK:
+ target = (void *) &inti->mchk;
+ source = &uptr->u.mchk;
+ size = sizeof(inti->mchk);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (copy_from_user(target, source, size))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int enqueue_floating_irq(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ struct kvm_s390_interrupt_info *inti = NULL;
+ int r = 0;
+ int len = attr->attr;
+
+ if (len % sizeof(struct kvm_s390_irq) != 0)
+ return -EINVAL;
+ else if (len > KVM_S390_FLIC_MAX_BUFFER)
+ return -EINVAL;
+
+ while (len >= sizeof(struct kvm_s390_irq)) {
+ inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
+ if (!inti)
+ return -ENOMEM;
+
+ r = copy_irq_from_user(inti, attr->addr);
+ if (r) {
+ kfree(inti);
+ return r;
+ }
+ r = __inject_vm(dev->kvm, inti);
+ if (r) {
+ kfree(inti);
+ return r;
+ }
+ len -= sizeof(struct kvm_s390_irq);
+ attr->addr += sizeof(struct kvm_s390_irq);
+ }
+
+ return r;
+}
+
+static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
+{
+ if (id >= MAX_S390_IO_ADAPTERS)
+ return NULL;
+ id = array_index_nospec(id, MAX_S390_IO_ADAPTERS);
+ return kvm->arch.adapters[id];
+}
+
+static int register_io_adapter(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ struct s390_io_adapter *adapter;
+ struct kvm_s390_io_adapter adapter_info;
+
+ if (copy_from_user(&adapter_info,
+ (void __user *)attr->addr, sizeof(adapter_info)))
+ return -EFAULT;
+
+ if (adapter_info.id >= MAX_S390_IO_ADAPTERS)
+ return -EINVAL;
+
+ adapter_info.id = array_index_nospec(adapter_info.id,
+ MAX_S390_IO_ADAPTERS);
+
+ if (dev->kvm->arch.adapters[adapter_info.id] != NULL)
+ return -EINVAL;
+
+ adapter = kzalloc(sizeof(*adapter), GFP_KERNEL_ACCOUNT);
+ if (!adapter)
+ return -ENOMEM;
+
+ adapter->id = adapter_info.id;
+ adapter->isc = adapter_info.isc;
+ adapter->maskable = adapter_info.maskable;
+ adapter->masked = false;
+ adapter->swap = adapter_info.swap;
+ adapter->suppressible = (adapter_info.flags) &
+ KVM_S390_ADAPTER_SUPPRESSIBLE;
+ dev->kvm->arch.adapters[adapter->id] = adapter;
+
+ return 0;
+}
+
+int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
+{
+ int ret;
+ struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+
+ if (!adapter || !adapter->maskable)
+ return -EINVAL;
+ ret = adapter->masked;
+ adapter->masked = masked;
+ return ret;
+}
+
+void kvm_s390_destroy_adapters(struct kvm *kvm)
+{
+ int i;
+
+ for (i = 0; i < MAX_S390_IO_ADAPTERS; i++)
+ kfree(kvm->arch.adapters[i]);
+}
+
+static int modify_io_adapter(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ struct kvm_s390_io_adapter_req req;
+ struct s390_io_adapter *adapter;
+ int ret;
+
+ if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
+ return -EFAULT;
+
+ adapter = get_io_adapter(dev->kvm, req.id);
+ if (!adapter)
+ return -EINVAL;
+ switch (req.type) {
+ case KVM_S390_IO_ADAPTER_MASK:
+ ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
+ if (ret > 0)
+ ret = 0;
+ break;
+ /*
+ * The following operations are no longer needed and therefore no-ops.
+ * The gpa to hva translation is done when an IRQ route is set up. The
+ * set_irq code uses get_user_pages_remote() to do the actual write.
+ */
+ case KVM_S390_IO_ADAPTER_MAP:
+ case KVM_S390_IO_ADAPTER_UNMAP:
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
+
+{
+ const u64 isc_mask = 0xffUL << 24; /* all iscs set */
+ u32 schid;
+
+ if (attr->flags)
+ return -EINVAL;
+ if (attr->attr != sizeof(schid))
+ return -EINVAL;
+ if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
+ return -EFAULT;
+ if (!schid)
+ return -EINVAL;
+ kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
+ /*
+ * If userspace is conforming to the architecture, we can have at most
+ * one pending I/O interrupt per subchannel, so this is effectively a
+ * clear all.
+ */
+ return 0;
+}
+
+static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_ais_req req;
+ int ret = 0;
+
+ if (!test_kvm_facility(kvm, 72))
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
+ return -EFAULT;
+
+ if (req.isc > MAX_ISC)
+ return -EINVAL;
+
+ trace_kvm_s390_modify_ais_mode(req.isc,
+ (fi->simm & AIS_MODE_MASK(req.isc)) ?
+ (fi->nimm & AIS_MODE_MASK(req.isc)) ?
+ 2 : KVM_S390_AIS_MODE_SINGLE :
+ KVM_S390_AIS_MODE_ALL, req.mode);
+
+ mutex_lock(&fi->ais_lock);
+ switch (req.mode) {
+ case KVM_S390_AIS_MODE_ALL:
+ fi->simm &= ~AIS_MODE_MASK(req.isc);
+ fi->nimm &= ~AIS_MODE_MASK(req.isc);
+ break;
+ case KVM_S390_AIS_MODE_SINGLE:
+ fi->simm |= AIS_MODE_MASK(req.isc);
+ fi->nimm &= ~AIS_MODE_MASK(req.isc);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&fi->ais_lock);
+
+ return ret;
+}
+
+static int kvm_s390_inject_airq(struct kvm *kvm,
+ struct s390_io_adapter *adapter)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_interrupt s390int = {
+ .type = KVM_S390_INT_IO(1, 0, 0, 0),
+ .parm = 0,
+ .parm64 = isc_to_int_word(adapter->isc),
+ };
+ int ret = 0;
+
+ if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
+ return kvm_s390_inject_vm(kvm, &s390int);
+
+ mutex_lock(&fi->ais_lock);
+ if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
+ trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
+ goto out;
+ }
+
+ ret = kvm_s390_inject_vm(kvm, &s390int);
+ if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
+ fi->nimm |= AIS_MODE_MASK(adapter->isc);
+ trace_kvm_s390_modify_ais_mode(adapter->isc,
+ KVM_S390_AIS_MODE_SINGLE, 2);
+ }
+out:
+ mutex_unlock(&fi->ais_lock);
+ return ret;
+}
+
+static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ unsigned int id = attr->attr;
+ struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+
+ if (!adapter)
+ return -EINVAL;
+
+ return kvm_s390_inject_airq(kvm, adapter);
+}
+
+static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+ struct kvm_s390_ais_all ais;
+
+ if (!test_kvm_facility(kvm, 72))
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
+ return -EFAULT;
+
+ mutex_lock(&fi->ais_lock);
+ fi->simm = ais.simm;
+ fi->nimm = ais.nimm;
+ mutex_unlock(&fi->ais_lock);
+
+ return 0;
+}
+
+static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ int r = 0;
+ unsigned long i;
+ struct kvm_vcpu *vcpu;
+
+ switch (attr->group) {
+ case KVM_DEV_FLIC_ENQUEUE:
+ r = enqueue_floating_irq(dev, attr);
+ break;
+ case KVM_DEV_FLIC_CLEAR_IRQS:
+ kvm_s390_clear_float_irqs(dev->kvm);
+ break;
+ case KVM_DEV_FLIC_APF_ENABLE:
+ dev->kvm->arch.gmap->pfault_enabled = 1;
+ break;
+ case KVM_DEV_FLIC_APF_DISABLE_WAIT:
+ dev->kvm->arch.gmap->pfault_enabled = 0;
+ /*
+ * Make sure no async faults are in transition when
+ * clearing the queues. So we don't need to worry
+ * about late coming workers.
+ */
+ synchronize_srcu(&dev->kvm->srcu);
+ kvm_for_each_vcpu(i, vcpu, dev->kvm)
+ kvm_clear_async_pf_completion_queue(vcpu);
+ break;
+ case KVM_DEV_FLIC_ADAPTER_REGISTER:
+ r = register_io_adapter(dev, attr);
+ break;
+ case KVM_DEV_FLIC_ADAPTER_MODIFY:
+ r = modify_io_adapter(dev, attr);
+ break;
+ case KVM_DEV_FLIC_CLEAR_IO_IRQ:
+ r = clear_io_irq(dev->kvm, attr);
+ break;
+ case KVM_DEV_FLIC_AISM:
+ r = modify_ais_mode(dev->kvm, attr);
+ break;
+ case KVM_DEV_FLIC_AIRQ_INJECT:
+ r = flic_inject_airq(dev->kvm, attr);
+ break;
+ case KVM_DEV_FLIC_AISM_ALL:
+ r = flic_ais_mode_set_all(dev->kvm, attr);
+ break;
+ default:
+ r = -EINVAL;
+ }
+
+ return r;
+}
+
+static int flic_has_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ switch (attr->group) {
+ case KVM_DEV_FLIC_GET_ALL_IRQS:
+ case KVM_DEV_FLIC_ENQUEUE:
+ case KVM_DEV_FLIC_CLEAR_IRQS:
+ case KVM_DEV_FLIC_APF_ENABLE:
+ case KVM_DEV_FLIC_APF_DISABLE_WAIT:
+ case KVM_DEV_FLIC_ADAPTER_REGISTER:
+ case KVM_DEV_FLIC_ADAPTER_MODIFY:
+ case KVM_DEV_FLIC_CLEAR_IO_IRQ:
+ case KVM_DEV_FLIC_AISM:
+ case KVM_DEV_FLIC_AIRQ_INJECT:
+ case KVM_DEV_FLIC_AISM_ALL:
+ return 0;
+ }
+ return -ENXIO;
+}
+
+static int flic_create(struct kvm_device *dev, u32 type)
+{
+ if (!dev)
+ return -EINVAL;
+ if (dev->kvm->arch.flic)
+ return -EINVAL;
+ dev->kvm->arch.flic = dev;
+ return 0;
+}
+
+static void flic_destroy(struct kvm_device *dev)
+{
+ dev->kvm->arch.flic = NULL;
+ kfree(dev);
+}
+
+/* s390 floating irq controller (flic) */
+struct kvm_device_ops kvm_flic_ops = {
+ .name = "kvm-flic",
+ .get_attr = flic_get_attr,
+ .set_attr = flic_set_attr,
+ .has_attr = flic_has_attr,
+ .create = flic_create,
+ .destroy = flic_destroy,
+};
+
+static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
+{
+ unsigned long bit;
+
+ bit = bit_nr + (addr % PAGE_SIZE) * 8;
+
+ return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
+}
+
+static struct page *get_map_page(struct kvm *kvm, u64 uaddr)
+{
+ struct page *page = NULL;
+
+ mmap_read_lock(kvm->mm);
+ get_user_pages_remote(kvm->mm, uaddr, 1, FOLL_WRITE,
+ &page, NULL);
+ mmap_read_unlock(kvm->mm);
+ return page;
+}
+
+static int adapter_indicators_set(struct kvm *kvm,
+ struct s390_io_adapter *adapter,
+ struct kvm_s390_adapter_int *adapter_int)
+{
+ unsigned long bit;
+ int summary_set, idx;
+ struct page *ind_page, *summary_page;
+ void *map;
+
+ ind_page = get_map_page(kvm, adapter_int->ind_addr);
+ if (!ind_page)
+ return -1;
+ summary_page = get_map_page(kvm, adapter_int->summary_addr);
+ if (!summary_page) {
+ put_page(ind_page);
+ return -1;
+ }
+
+ idx = srcu_read_lock(&kvm->srcu);
+ map = page_address(ind_page);
+ bit = get_ind_bit(adapter_int->ind_addr,
+ adapter_int->ind_offset, adapter->swap);
+ set_bit(bit, map);
+ mark_page_dirty(kvm, adapter_int->ind_addr >> PAGE_SHIFT);
+ set_page_dirty_lock(ind_page);
+ map = page_address(summary_page);
+ bit = get_ind_bit(adapter_int->summary_addr,
+ adapter_int->summary_offset, adapter->swap);
+ summary_set = test_and_set_bit(bit, map);
+ mark_page_dirty(kvm, adapter_int->summary_addr >> PAGE_SHIFT);
+ set_page_dirty_lock(summary_page);
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ put_page(ind_page);
+ put_page(summary_page);
+ return summary_set ? 0 : 1;
+}
+
+/*
+ * < 0 - not injected due to error
+ * = 0 - coalesced, summary indicator already active
+ * > 0 - injected interrupt
+ */
+static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
+{
+ int ret;
+ struct s390_io_adapter *adapter;
+
+ /* We're only interested in the 0->1 transition. */
+ if (!level)
+ return 0;
+ adapter = get_io_adapter(kvm, e->adapter.adapter_id);
+ if (!adapter)
+ return -1;
+ ret = adapter_indicators_set(kvm, adapter, &e->adapter);
+ if ((ret > 0) && !adapter->masked) {
+ ret = kvm_s390_inject_airq(kvm, adapter);
+ if (ret == 0)
+ ret = 1;
+ }
+ return ret;
+}
+
+/*
+ * Inject the machine check to the guest.
+ */
+void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
+ struct mcck_volatile_info *mcck_info)
+{
+ struct kvm_s390_interrupt_info inti;
+ struct kvm_s390_irq irq;
+ struct kvm_s390_mchk_info *mchk;
+ union mci mci;
+ __u64 cr14 = 0; /* upper bits are not used */
+ int rc;
+
+ mci.val = mcck_info->mcic;
+ if (mci.sr)
+ cr14 |= CR14_RECOVERY_SUBMASK;
+ if (mci.dg)
+ cr14 |= CR14_DEGRADATION_SUBMASK;
+ if (mci.w)
+ cr14 |= CR14_WARNING_SUBMASK;
+
+ mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
+ mchk->cr14 = cr14;
+ mchk->mcic = mcck_info->mcic;
+ mchk->ext_damage_code = mcck_info->ext_damage_code;
+ mchk->failing_storage_address = mcck_info->failing_storage_address;
+ if (mci.ck) {
+ /* Inject the floating machine check */
+ inti.type = KVM_S390_MCHK;
+ rc = __inject_vm(vcpu->kvm, &inti);
+ } else {
+ /* Inject the machine check to specified vcpu */
+ irq.type = KVM_S390_MCHK;
+ rc = kvm_s390_inject_vcpu(vcpu, &irq);
+ }
+ WARN_ON_ONCE(rc);
+}
+
+int kvm_set_routing_entry(struct kvm *kvm,
+ struct kvm_kernel_irq_routing_entry *e,
+ const struct kvm_irq_routing_entry *ue)
+{
+ u64 uaddr;
+
+ switch (ue->type) {
+ /* we store the userspace addresses instead of the guest addresses */
+ case KVM_IRQ_ROUTING_S390_ADAPTER:
+ e->set = set_adapter_int;
+ uaddr = gmap_translate(kvm->arch.gmap, ue->u.adapter.summary_addr);
+ if (uaddr == -EFAULT)
+ return -EFAULT;
+ e->adapter.summary_addr = uaddr;
+ uaddr = gmap_translate(kvm->arch.gmap, ue->u.adapter.ind_addr);
+ if (uaddr == -EFAULT)
+ return -EFAULT;
+ e->adapter.ind_addr = uaddr;
+ e->adapter.summary_offset = ue->u.adapter.summary_offset;
+ e->adapter.ind_offset = ue->u.adapter.ind_offset;
+ e->adapter.adapter_id = ue->u.adapter.adapter_id;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
+ int irq_source_id, int level, bool line_status)
+{
+ return -EINVAL;
+}
+
+int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
+{
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ struct kvm_s390_irq *buf;
+ int r = 0;
+ int n;
+
+ buf = vmalloc(len);
+ if (!buf)
+ return -ENOMEM;
+
+ if (copy_from_user((void *) buf, irqstate, len)) {
+ r = -EFAULT;
+ goto out_free;
+ }
+
+ /*
+ * Don't allow setting the interrupt state
+ * when there are already interrupts pending
+ */
+ spin_lock(&li->lock);
+ if (li->pending_irqs) {
+ r = -EBUSY;
+ goto out_unlock;
+ }
+
+ for (n = 0; n < len / sizeof(*buf); n++) {
+ r = do_inject_vcpu(vcpu, &buf[n]);
+ if (r)
+ break;
+ }
+
+out_unlock:
+ spin_unlock(&li->lock);
+out_free:
+ vfree(buf);
+
+ return r;
+}
+
+static void store_local_irq(struct kvm_s390_local_interrupt *li,
+ struct kvm_s390_irq *irq,
+ unsigned long irq_type)
+{
+ switch (irq_type) {
+ case IRQ_PEND_MCHK_EX:
+ case IRQ_PEND_MCHK_REP:
+ irq->type = KVM_S390_MCHK;
+ irq->u.mchk = li->irq.mchk;
+ break;
+ case IRQ_PEND_PROG:
+ irq->type = KVM_S390_PROGRAM_INT;
+ irq->u.pgm = li->irq.pgm;
+ break;
+ case IRQ_PEND_PFAULT_INIT:
+ irq->type = KVM_S390_INT_PFAULT_INIT;
+ irq->u.ext = li->irq.ext;
+ break;
+ case IRQ_PEND_EXT_EXTERNAL:
+ irq->type = KVM_S390_INT_EXTERNAL_CALL;
+ irq->u.extcall = li->irq.extcall;
+ break;
+ case IRQ_PEND_EXT_CLOCK_COMP:
+ irq->type = KVM_S390_INT_CLOCK_COMP;
+ break;
+ case IRQ_PEND_EXT_CPU_TIMER:
+ irq->type = KVM_S390_INT_CPU_TIMER;
+ break;
+ case IRQ_PEND_SIGP_STOP:
+ irq->type = KVM_S390_SIGP_STOP;
+ irq->u.stop = li->irq.stop;
+ break;
+ case IRQ_PEND_RESTART:
+ irq->type = KVM_S390_RESTART;
+ break;
+ case IRQ_PEND_SET_PREFIX:
+ irq->type = KVM_S390_SIGP_SET_PREFIX;
+ irq->u.prefix = li->irq.prefix;
+ break;
+ }
+}
+
+int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
+{
+ int scn;
+ DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
+ struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ unsigned long pending_irqs;
+ struct kvm_s390_irq irq;
+ unsigned long irq_type;
+ int cpuaddr;
+ int n = 0;
+
+ spin_lock(&li->lock);
+ pending_irqs = li->pending_irqs;
+ memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
+ sizeof(sigp_emerg_pending));
+ spin_unlock(&li->lock);
+
+ for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
+ memset(&irq, 0, sizeof(irq));
+ if (irq_type == IRQ_PEND_EXT_EMERGENCY)
+ continue;
+ if (n + sizeof(irq) > len)
+ return -ENOBUFS;
+ store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
+ if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+ return -EFAULT;
+ n += sizeof(irq);
+ }
+
+ if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
+ for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
+ memset(&irq, 0, sizeof(irq));
+ if (n + sizeof(irq) > len)
+ return -ENOBUFS;
+ irq.type = KVM_S390_INT_EMERGENCY;
+ irq.u.emerg.code = cpuaddr;
+ if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+ return -EFAULT;
+ n += sizeof(irq);
+ }
+ }
+
+ if (sca_ext_call_pending(vcpu, &scn)) {
+ if (n + sizeof(irq) > len)
+ return -ENOBUFS;
+ memset(&irq, 0, sizeof(irq));
+ irq.type = KVM_S390_INT_EXTERNAL_CALL;
+ irq.u.extcall.code = scn;
+ if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+ return -EFAULT;
+ n += sizeof(irq);
+ }
+
+ return n;
+}
+
+static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
+{
+ int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_vcpu *vcpu;
+ u8 vcpu_isc_mask;
+
+ for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
+ vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+ if (psw_ioint_disabled(vcpu))
+ continue;
+ vcpu_isc_mask = (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
+ if (deliverable_mask & vcpu_isc_mask) {
+ /* lately kicked but not yet running */
+ if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
+ return;
+ kvm_s390_vcpu_wakeup(vcpu);
+ return;
+ }
+ }
+}
+
+static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
+{
+ struct kvm_s390_gisa_interrupt *gi =
+ container_of(timer, struct kvm_s390_gisa_interrupt, timer);
+ struct kvm *kvm =
+ container_of(gi->origin, struct sie_page2, gisa)->kvm;
+ u8 pending_mask;
+
+ pending_mask = gisa_get_ipm_or_restore_iam(gi);
+ if (pending_mask) {
+ __airqs_kick_single_vcpu(kvm, pending_mask);
+ hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
+ return HRTIMER_RESTART;
+ }
+
+ return HRTIMER_NORESTART;
+}
+
+#define NULL_GISA_ADDR 0x00000000UL
+#define NONE_GISA_ADDR 0x00000001UL
+#define GISA_ADDR_MASK 0xfffff000UL
+
+static void process_gib_alert_list(void)
+{
+ struct kvm_s390_gisa_interrupt *gi;
+ u32 final, gisa_phys, origin = 0UL;
+ struct kvm_s390_gisa *gisa;
+ struct kvm *kvm;
+
+ do {
+ /*
+ * If the NONE_GISA_ADDR is still stored in the alert list
+ * origin, we will leave the outer loop. No further GISA has
+ * been added to the alert list by millicode while processing
+ * the current alert list.
+ */
+ final = (origin & NONE_GISA_ADDR);
+ /*
+ * Cut off the alert list and store the NONE_GISA_ADDR in the
+ * alert list origin to avoid further GAL interruptions.
+ * A new alert list can be build up by millicode in parallel
+ * for guests not in the yet cut-off alert list. When in the
+ * final loop, store the NULL_GISA_ADDR instead. This will re-
+ * enable GAL interruptions on the host again.
+ */
+ origin = xchg(&gib->alert_list_origin,
+ (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
+ /*
+ * Loop through the just cut-off alert list and start the
+ * gisa timers to kick idle vcpus to consume the pending
+ * interruptions asap.
+ */
+ while (origin & GISA_ADDR_MASK) {
+ gisa_phys = origin;
+ gisa = phys_to_virt(gisa_phys);
+ origin = gisa->next_alert;
+ gisa->next_alert = gisa_phys;
+ kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
+ gi = &kvm->arch.gisa_int;
+ if (hrtimer_active(&gi->timer))
+ hrtimer_cancel(&gi->timer);
+ hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
+ }
+ } while (!final);
+
+}
+
+void kvm_s390_gisa_clear(struct kvm *kvm)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+
+ if (!gi->origin)
+ return;
+ gisa_clear_ipm(gi->origin);
+ VM_EVENT(kvm, 3, "gisa 0x%pK cleared", gi->origin);
+}
+
+void kvm_s390_gisa_init(struct kvm *kvm)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+
+ if (!css_general_characteristics.aiv)
+ return;
+ gi->origin = &kvm->arch.sie_page2->gisa;
+ gi->alert.mask = 0;
+ spin_lock_init(&gi->alert.ref_lock);
+ gi->expires = 50 * 1000; /* 50 usec */
+ hrtimer_init(&gi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ gi->timer.function = gisa_vcpu_kicker;
+ memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
+ gi->origin->next_alert = (u32)virt_to_phys(gi->origin);
+ VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin);
+}
+
+void kvm_s390_gisa_enable(struct kvm *kvm)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+ u32 gisa_desc;
+
+ if (gi->origin)
+ return;
+ kvm_s390_gisa_init(kvm);
+ gisa_desc = kvm_s390_get_gisa_desc(kvm);
+ if (!gisa_desc)
+ return;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ mutex_lock(&vcpu->mutex);
+ vcpu->arch.sie_block->gd = gisa_desc;
+ 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);
+ mutex_unlock(&vcpu->mutex);
+ }
+}
+
+void kvm_s390_gisa_destroy(struct kvm *kvm)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_s390_gisa *gisa = gi->origin;
+
+ if (!gi->origin)
+ return;
+ WARN(gi->alert.mask != 0x00,
+ "unexpected non zero alert.mask 0x%02x",
+ gi->alert.mask);
+ gi->alert.mask = 0x00;
+ if (gisa_set_iam(gi->origin, gi->alert.mask))
+ process_gib_alert_list();
+ hrtimer_cancel(&gi->timer);
+ gi->origin = NULL;
+ VM_EVENT(kvm, 3, "gisa 0x%pK destroyed", gisa);
+}
+
+void kvm_s390_gisa_disable(struct kvm *kvm)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+
+ if (!gi->origin)
+ return;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ mutex_lock(&vcpu->mutex);
+ vcpu->arch.sie_block->eca &= ~ECA_AIV;
+ vcpu->arch.sie_block->gd = 0U;
+ mutex_unlock(&vcpu->mutex);
+ VCPU_EVENT(vcpu, 3, "AIV disabled for cpu %03u", vcpu->vcpu_id);
+ }
+ kvm_s390_gisa_destroy(kvm);
+}
+
+/**
+ * kvm_s390_gisc_register - register a guest ISC
+ *
+ * @kvm: the kernel vm to work with
+ * @gisc: the guest interruption sub class to register
+ *
+ * The function extends the vm specific alert mask to use.
+ * The effective IAM mask in the GISA is updated as well
+ * in case the GISA is not part of the GIB alert list.
+ * It will be updated latest when the IAM gets restored
+ * by gisa_get_ipm_or_restore_iam().
+ *
+ * Returns: the nonspecific ISC (NISC) the gib alert mechanism
+ * has registered with the channel subsystem.
+ * -ENODEV in case the vm uses no GISA
+ * -ERANGE in case the guest ISC is invalid
+ */
+int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+
+ if (!gi->origin)
+ return -ENODEV;
+ if (gisc > MAX_ISC)
+ return -ERANGE;
+
+ spin_lock(&gi->alert.ref_lock);
+ gi->alert.ref_count[gisc]++;
+ if (gi->alert.ref_count[gisc] == 1) {
+ gi->alert.mask |= 0x80 >> gisc;
+ gisa_set_iam(gi->origin, gi->alert.mask);
+ }
+ spin_unlock(&gi->alert.ref_lock);
+
+ return gib->nisc;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
+
+/**
+ * kvm_s390_gisc_unregister - unregister a guest ISC
+ *
+ * @kvm: the kernel vm to work with
+ * @gisc: the guest interruption sub class to register
+ *
+ * The function reduces the vm specific alert mask to use.
+ * The effective IAM mask in the GISA is updated as well
+ * in case the GISA is not part of the GIB alert list.
+ * It will be updated latest when the IAM gets restored
+ * by gisa_get_ipm_or_restore_iam().
+ *
+ * Returns: the nonspecific ISC (NISC) the gib alert mechanism
+ * has registered with the channel subsystem.
+ * -ENODEV in case the vm uses no GISA
+ * -ERANGE in case the guest ISC is invalid
+ * -EINVAL in case the guest ISC is not registered
+ */
+int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
+{
+ struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
+ int rc = 0;
+
+ if (!gi->origin)
+ return -ENODEV;
+ if (gisc > MAX_ISC)
+ return -ERANGE;
+
+ spin_lock(&gi->alert.ref_lock);
+ if (gi->alert.ref_count[gisc] == 0) {
+ rc = -EINVAL;
+ goto out;
+ }
+ gi->alert.ref_count[gisc]--;
+ if (gi->alert.ref_count[gisc] == 0) {
+ gi->alert.mask &= ~(0x80 >> gisc);
+ gisa_set_iam(gi->origin, gi->alert.mask);
+ }
+out:
+ spin_unlock(&gi->alert.ref_lock);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
+
+static void aen_host_forward(unsigned long si)
+{
+ struct kvm_s390_gisa_interrupt *gi;
+ struct zpci_gaite *gaite;
+ struct kvm *kvm;
+
+ gaite = (struct zpci_gaite *)aift->gait +
+ (si * sizeof(struct zpci_gaite));
+ if (gaite->count == 0)
+ return;
+ if (gaite->aisb != 0)
+ set_bit_inv(gaite->aisbo, phys_to_virt(gaite->aisb));
+
+ kvm = kvm_s390_pci_si_to_kvm(aift, si);
+ if (!kvm)
+ return;
+ gi = &kvm->arch.gisa_int;
+
+ if (!(gi->origin->g1.simm & AIS_MODE_MASK(gaite->gisc)) ||
+ !(gi->origin->g1.nimm & AIS_MODE_MASK(gaite->gisc))) {
+ gisa_set_ipm_gisc(gi->origin, gaite->gisc);
+ if (hrtimer_active(&gi->timer))
+ hrtimer_cancel(&gi->timer);
+ hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
+ kvm->stat.aen_forward++;
+ }
+}
+
+static void aen_process_gait(u8 isc)
+{
+ bool found = false, first = true;
+ union zpci_sic_iib iib = {{0}};
+ unsigned long si, flags;
+
+ spin_lock_irqsave(&aift->gait_lock, flags);
+
+ if (!aift->gait) {
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+ return;
+ }
+
+ for (si = 0;;) {
+ /* Scan adapter summary indicator bit vector */
+ si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv));
+ if (si == -1UL) {
+ if (first || found) {
+ /* Re-enable interrupts. */
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc,
+ &iib);
+ first = found = false;
+ } else {
+ /* Interrupts on and all bits processed */
+ break;
+ }
+ found = false;
+ si = 0;
+ /* Scan again after re-enabling interrupts */
+ continue;
+ }
+ found = true;
+ aen_host_forward(si);
+ }
+
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+}
+
+static void gib_alert_irq_handler(struct airq_struct *airq,
+ struct tpi_info *tpi_info)
+{
+ struct tpi_adapter_info *info = (struct tpi_adapter_info *)tpi_info;
+
+ inc_irq_stat(IRQIO_GAL);
+
+ if ((info->forward || info->error) &&
+ IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
+ aen_process_gait(info->isc);
+ if (info->aism != 0)
+ process_gib_alert_list();
+ } else {
+ process_gib_alert_list();
+ }
+}
+
+static struct airq_struct gib_alert_irq = {
+ .handler = gib_alert_irq_handler,
+};
+
+void kvm_s390_gib_destroy(void)
+{
+ if (!gib)
+ return;
+ if (kvm_s390_pci_interp_allowed() && aift) {
+ mutex_lock(&aift->aift_lock);
+ kvm_s390_pci_aen_exit();
+ mutex_unlock(&aift->aift_lock);
+ }
+ chsc_sgib(0);
+ unregister_adapter_interrupt(&gib_alert_irq);
+ free_page((unsigned long)gib);
+ gib = NULL;
+}
+
+int __init kvm_s390_gib_init(u8 nisc)
+{
+ u32 gib_origin;
+ int rc = 0;
+
+ if (!css_general_characteristics.aiv) {
+ KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
+ goto out;
+ }
+
+ gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
+ if (!gib) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ gib_alert_irq.isc = nisc;
+ if (register_adapter_interrupt(&gib_alert_irq)) {
+ pr_err("Registering the GIB alert interruption handler failed\n");
+ rc = -EIO;
+ goto out_free_gib;
+ }
+ /* adapter interrupts used for AP (applicable here) don't use the LSI */
+ *gib_alert_irq.lsi_ptr = 0xff;
+
+ gib->nisc = nisc;
+ gib_origin = virt_to_phys(gib);
+ if (chsc_sgib(gib_origin)) {
+ pr_err("Associating the GIB with the AIV facility failed\n");
+ free_page((unsigned long)gib);
+ gib = NULL;
+ rc = -EIO;
+ goto out_unreg_gal;
+ }
+
+ if (kvm_s390_pci_interp_allowed()) {
+ if (kvm_s390_pci_aen_init(nisc)) {
+ pr_err("Initializing AEN for PCI failed\n");
+ rc = -EIO;
+ goto out_unreg_gal;
+ }
+ }
+
+ KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
+ goto out;
+
+out_unreg_gal:
+ unregister_adapter_interrupt(&gib_alert_irq);
+out_free_gib:
+ free_page((unsigned long)gib);
+ gib = NULL;
+out:
+ return rc;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-01 22:29:10 +0000