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kvm: x86: CPUID.01H:EDX.APIC[bit 9] should mirror IA32_APIC_BASE[11]

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From the Intel SDM, volume 3, section 10.4.3, "Enabling or Disabling the
Local APIC,"

  When IA32_APIC_BASE[11] is 0, the processor is functionally equivalent
  to an IA-32 processor without an on-chip APIC. The CPUID feature flag
  for the APIC (see Section 10.4.2, "Presence of the Local APIC") is
  also set to 0.

Signed-off-by: Jim Mattson <jmattson@google.com>
[Changed subject tag from nVMX to x86.]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Jim Mattson
2016-11-09 09:50:11 -08:00
committed by Radim Krčmář
parent 4504b5c941
commit c7dd15b337
2 changed files with 11 additions and 4 deletions
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11
arch/x86/kvm/lapic.c
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@@ -1806,14 +1806,17 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
u64 old_value = vcpu->arch.apic_base;
struct kvm_lapic *apic = vcpu->arch.apic;
if (!apic) {
if (!apic)
value |= MSR_IA32_APICBASE_BSP;
vcpu->arch.apic_base = value;
return;
}
vcpu->arch.apic_base = value;
if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE)
kvm_update_cpuid(vcpu);
if (!apic)
return;
/* update jump label if enable bit changes */
if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
if (value & MSR_IA32_APICBASE_ENABLE) {