diff options
Diffstat (limited to 'arch/x86/kvm/lapic.c')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 0664c138e860..f69fc5077a89 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -140,11 +140,6 @@ static inline int apic_enabled(struct kvm_lapic *apic) (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \ APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER) -static inline int apic_x2apic_mode(struct kvm_lapic *apic) -{ - return apic->vcpu->arch.apic_base & X2APIC_ENABLE; -} - static inline int kvm_apic_id(struct kvm_lapic *apic) { return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff; @@ -1303,6 +1298,7 @@ u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu) 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) { @@ -1324,11 +1320,16 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) value &= ~MSR_IA32_APICBASE_BSP; vcpu->arch.apic_base = value; - if (apic_x2apic_mode(apic)) { - u32 id = kvm_apic_id(apic); - u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf)); - kvm_apic_set_ldr(apic, ldr); + if ((old_value ^ value) & X2APIC_ENABLE) { + if (value & X2APIC_ENABLE) { + u32 id = kvm_apic_id(apic); + u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf)); + kvm_apic_set_ldr(apic, ldr); + kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true); + } else + kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false); } + apic->base_address = apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_BASE; |
