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KVM: x86: Fix APIC map calculation after re-enabling

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Update arch.apic_base before triggering recalculate_apic_map. Otherwise
the recalculation will work against the previous state of the APIC and
will fail to build the correct map when an APIC is hardware-enabled
again.

This fixes a regression of 1e08ec4a13.

Cc: stable@vger.kernel.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2013-12-29 02:29:30 +01:00 committed by Marcelo Tosatti
parent f41bfc9423
commit e66d2ae7c6
1 changed files with 4 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
arch/x86/kvm/lapic.c
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@ -1350,6 +1350,10 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
return; return;
} }
if (!kvm_vcpu_is_bsp(apic->vcpu))
value &= ~MSR_IA32_APICBASE_BSP;
vcpu->arch.apic_base = value;
/* update jump label if enable bit changes */ /* update jump label if enable bit changes */
if ((vcpu->arch.apic_base ^ value) & MSR_IA32_APICBASE_ENABLE) { if ((vcpu->arch.apic_base ^ value) & MSR_IA32_APICBASE_ENABLE) {
if (value & MSR_IA32_APICBASE_ENABLE) if (value & MSR_IA32_APICBASE_ENABLE)
@ -1359,10 +1363,6 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
recalculate_apic_map(vcpu->kvm); recalculate_apic_map(vcpu->kvm);
} }
if (!kvm_vcpu_is_bsp(apic->vcpu))
value &= ~MSR_IA32_APICBASE_BSP;
vcpu->arch.apic_base = value;
if ((old_value ^ value) & X2APIC_ENABLE) { if ((old_value ^ value) & X2APIC_ENABLE) {
if (value & X2APIC_ENABLE) { if (value & X2APIC_ENABLE) {
u32 id = kvm_apic_id(apic); u32 id = kvm_apic_id(apic);