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From f53b97e4cda28b911c11400a985bcff587b2df34 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Wed, 21 Aug 2019 14:30:06 +0200
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Subject: [PATCH 2/3] target-i386: block migration and savevm if invariant tsc
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is exposed
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20190821143006.23516-3-ehabkost@redhat.com>
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Patchwork-id: 90102
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O-Subject: [RHEL-7.8 qemu-kvm PATCH 2/2] target-i386: block migration and savevm if invariant tsc is exposed
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Bugzilla: 1626871
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Marcelo Tosatti <mtosatti@redhat.com>
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Invariant TSC documentation mentions that "invariant TSC will run at a
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constant rate in all ACPI P-, C-. and T-states".
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This is not the case if migration to a host with different TSC frequency
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is allowed, or if savevm is performed. So block migration/savevm.
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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[AF+mtosatti: Updated error message]
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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(cherry picked from commit 68bfd0ad4a1dcc4c328d5db85dc746b49c1ec07e)
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu-qom.h | 2 +-
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target-i386/kvm.c | 15 +++++++++++++++
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target-i386/machine.c | 2 +-
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3 files changed, 17 insertions(+), 2 deletions(-)
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diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
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index 0b01e8f..89dd29a 100644
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--- a/target-i386/cpu-qom.h
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+++ b/target-i386/cpu-qom.h
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@@ -94,7 +94,7 @@ static inline X86CPU *x86_env_get_cpu(CPUX86State *env)
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#define ENV_OFFSET offsetof(X86CPU, env)
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#ifndef CONFIG_USER_ONLY
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-extern const struct VMStateDescription vmstate_x86_cpu;
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+extern struct VMStateDescription vmstate_x86_cpu;
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#endif
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/**
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diff --git a/target-i386/kvm.c b/target-i386/kvm.c
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index d5f6deb..b6c76f1 100644
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--- a/target-i386/kvm.c
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+++ b/target-i386/kvm.c
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@@ -33,6 +33,8 @@
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#include "exec/ioport.h"
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#include <asm/hyperv.h>
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#include "hw/pci/pci.h"
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+#include "migration/migration.h"
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+#include "qapi/qmp/qerror.h"
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//#define DEBUG_KVM
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@@ -449,6 +451,8 @@ static bool hyperv_enabled(X86CPU *cpu)
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cpu->hyperv_relaxed_timing);
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}
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+static Error *invtsc_mig_blocker;
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+
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#define KVM_MAX_CPUID_ENTRIES 100
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int kvm_arch_init_vcpu(CPUState *cs)
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@@ -698,6 +702,17 @@ int kvm_arch_init_vcpu(CPUState *cs)
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qemu_add_vm_change_state_handler(cpu_update_state, env);
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+ c = cpuid_find_entry(&cpuid_data.cpuid, 0x80000007, 0);
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+ if (c && (c->edx & 1<<8) && invtsc_mig_blocker == NULL) {
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+ /* for migration */
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+ error_setg(&invtsc_mig_blocker,
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+ "State blocked by non-migratable CPU device"
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+ " (invtsc flag)");
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+ migrate_add_blocker(invtsc_mig_blocker);
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+ /* for savevm */
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+ vmstate_x86_cpu.unmigratable = 1;
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+ }
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+
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cpuid_data.cpuid.padding = 0;
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r = kvm_vcpu_ioctl(cs, KVM_SET_CPUID2, &cpuid_data);
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if (r) {
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diff --git a/target-i386/machine.c b/target-i386/machine.c
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index 507ab1a..cd2cf6f 100644
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--- a/target-i386/machine.c
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+++ b/target-i386/machine.c
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@@ -778,7 +778,7 @@ static const VMStateDescription vmstate_msr_virt_ssbd = {
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}
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};
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-const VMStateDescription vmstate_x86_cpu = {
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+VMStateDescription vmstate_x86_cpu = {
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.name = "cpu",
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.version_id = 12,
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.minimum_version_id = 3,
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--
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1.8.3.1
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