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-rw-r--r--arch/x86/xen/smp_pv.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
new file mode 100644
index 000000000..e97bab7b0
--- /dev/null
+++ b/arch/x86/xen/smp_pv.c
@@ -0,0 +1,470 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xen SMP support
+ *
+ * This file implements the Xen versions of smp_ops. SMP under Xen is
+ * very straightforward. Bringing a CPU up is simply a matter of
+ * loading its initial context and setting it running.
+ *
+ * IPIs are handled through the Xen event mechanism.
+ *
+ * Because virtual CPUs can be scheduled onto any real CPU, there's no
+ * useful topology information for the kernel to make use of. As a
+ * result, all CPUs are treated as if they're single-core and
+ * single-threaded.
+ */
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/irq_work.h>
+#include <linux/tick.h>
+#include <linux/nmi.h>
+#include <linux/cpuhotplug.h>
+#include <linux/stackprotector.h>
+#include <linux/pgtable.h>
+
+#include <asm/paravirt.h>
+#include <asm/idtentry.h>
+#include <asm/desc.h>
+#include <asm/cpu.h>
+#include <asm/io_apic.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/vcpu.h>
+#include <xen/interface/xenpmu.h>
+
+#include <asm/spec-ctrl.h>
+#include <asm/xen/interface.h>
+#include <asm/xen/hypercall.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/events.h>
+
+#include <xen/hvc-console.h>
+#include "xen-ops.h"
+#include "mmu.h"
+#include "smp.h"
+#include "pmu.h"
+
+cpumask_var_t xen_cpu_initialized_map;
+
+static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
+
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
+void asm_cpu_bringup_and_idle(void);
+
+static void cpu_bringup(void)
+{
+ int cpu;
+
+ cr4_init();
+ cpu_init();
+ fpu__init_cpu();
+ touch_softlockup_watchdog();
+
+ /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
+ if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
+ xen_enable_sysenter();
+ xen_enable_syscall();
+ }
+ cpu = smp_processor_id();
+ smp_store_cpu_info(cpu);
+ cpu_data(cpu).x86_max_cores = 1;
+ set_cpu_sibling_map(cpu);
+
+ speculative_store_bypass_ht_init();
+
+ xen_setup_cpu_clockevents();
+
+ notify_cpu_starting(cpu);
+
+ set_cpu_online(cpu, true);
+
+ cpu_set_state_online(cpu); /* Implies full memory barrier. */
+
+ /* We can take interrupts now: we're officially "up". */
+ local_irq_enable();
+}
+
+asmlinkage __visible void cpu_bringup_and_idle(void)
+{
+ cpu_bringup();
+ cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
+
+void xen_smp_intr_free_pv(unsigned int cpu)
+{
+ kfree(per_cpu(xen_irq_work, cpu).name);
+ per_cpu(xen_irq_work, cpu).name = NULL;
+ if (per_cpu(xen_irq_work, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
+ per_cpu(xen_irq_work, cpu).irq = -1;
+ }
+
+ kfree(per_cpu(xen_pmu_irq, cpu).name);
+ per_cpu(xen_pmu_irq, cpu).name = NULL;
+ if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
+ per_cpu(xen_pmu_irq, cpu).irq = -1;
+ }
+}
+
+int xen_smp_intr_init_pv(unsigned int cpu)
+{
+ int rc;
+ char *callfunc_name, *pmu_name;
+
+ callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
+ per_cpu(xen_irq_work, cpu).name = callfunc_name;
+ rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
+ cpu,
+ xen_irq_work_interrupt,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ callfunc_name,
+ NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_irq_work, cpu).irq = rc;
+
+ if (is_xen_pmu) {
+ pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
+ per_cpu(xen_pmu_irq, cpu).name = pmu_name;
+ rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
+ xen_pmu_irq_handler,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ pmu_name, NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_pmu_irq, cpu).irq = rc;
+ }
+
+ return 0;
+
+ fail:
+ xen_smp_intr_free_pv(cpu);
+ return rc;
+}
+
+static void __init _get_smp_config(unsigned int early)
+{
+ int i, rc;
+ unsigned int subtract = 0;
+
+ if (early)
+ return;
+
+ num_processors = 0;
+ disabled_cpus = 0;
+ for (i = 0; i < nr_cpu_ids; i++) {
+ rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
+ if (rc >= 0) {
+ num_processors++;
+ set_cpu_possible(i, true);
+ } else {
+ set_cpu_possible(i, false);
+ set_cpu_present(i, false);
+ subtract++;
+ }
+ }
+#ifdef CONFIG_HOTPLUG_CPU
+ /* This is akin to using 'nr_cpus' on the Linux command line.
+ * Which is OK as when we use 'dom0_max_vcpus=X' we can only
+ * have up to X, while nr_cpu_ids is greater than X. This
+ * normally is not a problem, except when CPU hotplugging
+ * is involved and then there might be more than X CPUs
+ * in the guest - which will not work as there is no
+ * hypercall to expand the max number of VCPUs an already
+ * running guest has. So cap it up to X. */
+ if (subtract)
+ set_nr_cpu_ids(nr_cpu_ids - subtract);
+#endif
+
+}
+
+static void __init xen_pv_smp_prepare_boot_cpu(void)
+{
+ BUG_ON(smp_processor_id() != 0);
+ native_smp_prepare_boot_cpu();
+
+ if (!xen_feature(XENFEAT_writable_page_tables))
+ /* We've switched to the "real" per-cpu gdt, so make
+ * sure the old memory can be recycled. */
+ make_lowmem_page_readwrite(xen_initial_gdt);
+
+ xen_setup_vcpu_info_placement();
+
+ /*
+ * The alternative logic (which patches the unlock/lock) runs before
+ * the smp bootup up code is activated. Hence we need to set this up
+ * the core kernel is being patched. Otherwise we will have only
+ * modules patched but not core code.
+ */
+ xen_init_spinlocks();
+}
+
+static void __init xen_pv_smp_prepare_cpus(unsigned int max_cpus)
+{
+ unsigned cpu;
+
+ if (skip_ioapic_setup) {
+ char *m = (max_cpus == 0) ?
+ "The nosmp parameter is incompatible with Xen; " \
+ "use Xen dom0_max_vcpus=1 parameter" :
+ "The noapic parameter is incompatible with Xen";
+
+ xen_raw_printk(m);
+ panic(m);
+ }
+ xen_init_lock_cpu(0);
+
+ smp_prepare_cpus_common();
+
+ cpu_data(0).x86_max_cores = 1;
+
+ speculative_store_bypass_ht_init();
+
+ xen_pmu_init(0);
+
+ if (xen_smp_intr_init(0) || xen_smp_intr_init_pv(0))
+ BUG();
+
+ if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
+ panic("could not allocate xen_cpu_initialized_map\n");
+
+ cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
+
+ /* Restrict the possible_map according to max_cpus. */
+ while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
+ for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
+ continue;
+ set_cpu_possible(cpu, false);
+ }
+
+ for_each_possible_cpu(cpu)
+ set_cpu_present(cpu, true);
+}
+
+static int
+cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
+{
+ struct vcpu_guest_context *ctxt;
+ struct desc_struct *gdt;
+ unsigned long gdt_mfn;
+
+ /* used to tell cpu_init() that it can proceed with initialization */
+ cpumask_set_cpu(cpu, cpu_callout_mask);
+ if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
+ return 0;
+
+ ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
+ if (ctxt == NULL) {
+ cpumask_clear_cpu(cpu, xen_cpu_initialized_map);
+ cpumask_clear_cpu(cpu, cpu_callout_mask);
+ return -ENOMEM;
+ }
+
+ gdt = get_cpu_gdt_rw(cpu);
+
+ /*
+ * Bring up the CPU in cpu_bringup_and_idle() with the stack
+ * pointing just below where pt_regs would be if it were a normal
+ * kernel entry.
+ */
+ ctxt->user_regs.eip = (unsigned long)asm_cpu_bringup_and_idle;
+ ctxt->flags = VGCF_IN_KERNEL;
+ ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
+ ctxt->user_regs.ds = __USER_DS;
+ ctxt->user_regs.es = __USER_DS;
+ ctxt->user_regs.ss = __KERNEL_DS;
+ ctxt->user_regs.cs = __KERNEL_CS;
+ ctxt->user_regs.esp = (unsigned long)task_pt_regs(idle);
+
+ xen_copy_trap_info(ctxt->trap_ctxt);
+
+ BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+
+ gdt_mfn = arbitrary_virt_to_mfn(gdt);
+ make_lowmem_page_readonly(gdt);
+ make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
+
+ ctxt->gdt_frames[0] = gdt_mfn;
+ ctxt->gdt_ents = GDT_ENTRIES;
+
+ /*
+ * Set SS:SP that Xen will use when entering guest kernel mode
+ * from guest user mode. Subsequent calls to load_sp0() can
+ * change this value.
+ */
+ ctxt->kernel_ss = __KERNEL_DS;
+ ctxt->kernel_sp = task_top_of_stack(idle);
+
+ ctxt->gs_base_kernel = per_cpu_offset(cpu);
+ ctxt->event_callback_eip =
+ (unsigned long)xen_asm_exc_xen_hypervisor_callback;
+ ctxt->failsafe_callback_eip =
+ (unsigned long)xen_failsafe_callback;
+ per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
+
+ ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
+ if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
+ BUG();
+
+ kfree(ctxt);
+ return 0;
+}
+
+static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
+{
+ int rc;
+
+ rc = common_cpu_up(cpu, idle);
+ if (rc)
+ return rc;
+
+ xen_setup_runstate_info(cpu);
+
+ /*
+ * PV VCPUs are always successfully taken down (see 'while' loop
+ * in xen_cpu_die()), so -EBUSY is an error.
+ */
+ rc = cpu_check_up_prepare(cpu);
+ if (rc)
+ return rc;
+
+ /* make sure interrupts start blocked */
+ per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
+
+ rc = cpu_initialize_context(cpu, idle);
+ if (rc)
+ return rc;
+
+ xen_pmu_init(cpu);
+
+ rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
+ BUG_ON(rc);
+
+ while (cpu_report_state(cpu) != CPU_ONLINE)
+ HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int xen_pv_cpu_disable(void)
+{
+ unsigned int cpu = smp_processor_id();
+ if (cpu == 0)
+ return -EBUSY;
+
+ cpu_disable_common();
+
+ load_cr3(swapper_pg_dir);
+ return 0;
+}
+
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+ while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
+ xen_vcpu_nr(cpu), NULL)) {
+ __set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(HZ/10);
+ }
+
+ if (common_cpu_die(cpu) == 0) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
+ xen_teardown_timer(cpu);
+ xen_pmu_finish(cpu);
+ }
+}
+
+static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
+{
+ play_dead_common();
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
+ cpu_bringup();
+ /*
+ * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
+ * clears certain data that the cpu_idle loop (which called us
+ * and that we return from) expects. The only way to get that
+ * data back is to call:
+ */
+ tick_nohz_idle_enter();
+ tick_nohz_idle_stop_tick_protected();
+
+ cpuhp_online_idle(CPUHP_AP_ONLINE_IDLE);
+}
+
+#else /* !CONFIG_HOTPLUG_CPU */
+static int xen_pv_cpu_disable(void)
+{
+ return -ENOSYS;
+}
+
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+ BUG();
+}
+
+static void xen_pv_play_dead(void)
+{
+ BUG();
+}
+
+#endif
+static void stop_self(void *v)
+{
+ int cpu = smp_processor_id();
+
+ /* make sure we're not pinning something down */
+ load_cr3(swapper_pg_dir);
+ /* should set up a minimal gdt */
+
+ set_cpu_online(cpu, false);
+
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
+ BUG();
+}
+
+static void xen_pv_stop_other_cpus(int wait)
+{
+ smp_call_function(stop_self, NULL, wait);
+}
+
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
+{
+ irq_work_run();
+ inc_irq_stat(apic_irq_work_irqs);
+
+ return IRQ_HANDLED;
+}
+
+static const struct smp_ops xen_smp_ops __initconst = {
+ .smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
+ .smp_prepare_cpus = xen_pv_smp_prepare_cpus,
+ .smp_cpus_done = xen_smp_cpus_done,
+
+ .cpu_up = xen_pv_cpu_up,
+ .cpu_die = xen_pv_cpu_die,
+ .cpu_disable = xen_pv_cpu_disable,
+ .play_dead = xen_pv_play_dead,
+
+ .stop_other_cpus = xen_pv_stop_other_cpus,
+ .smp_send_reschedule = xen_smp_send_reschedule,
+
+ .send_call_func_ipi = xen_smp_send_call_function_ipi,
+ .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
+};
+
+void __init xen_smp_init(void)
+{
+ smp_ops = xen_smp_ops;
+
+ /* Avoid searching for BIOS MP tables */
+ x86_init.mpparse.find_smp_config = x86_init_noop;
+ x86_init.mpparse.get_smp_config = _get_smp_config;
+}