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KVM: x86: reset APIC ID when enabling LAPIC

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APIC ID should be set to the initial APIC ID when enabling LAPIC.
This only matters if the guest changes APIC ID.  No sane OS does that.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2016-07-12 22:09:23 +02:00 committed by Paolo Bonzini
parent a92e2543d6
commit 49bd29ba1d
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/lapic.c
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@ -1720,9 +1720,10 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
/* update jump label if enable bit changes */ /* update jump label if enable bit changes */
if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) { if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
if (value & MSR_IA32_APICBASE_ENABLE) if (value & MSR_IA32_APICBASE_ENABLE) {
kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
static_key_slow_dec_deferred(&apic_hw_disabled); static_key_slow_dec_deferred(&apic_hw_disabled);
else } else
static_key_slow_inc(&apic_hw_disabled.key); static_key_slow_inc(&apic_hw_disabled.key);
recalculate_apic_map(vcpu->kvm); recalculate_apic_map(vcpu->kvm);
} }