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KVM: correctly detect APIC SW state in kvm_apic_post_state_restore() 

For apic_set_spiv() to track APIC SW state correctly it needs to see
previous and next values of the spurious vector register, but currently
memset() overwrite the old value before apic_set_spiv() get a chance to
do tracking. Fix it by calling apic_set_spiv() before overwriting old
value.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2012-08-08 15:24:36 +03:00 committed by Avi Kivity
parent c48f14966c
commit 64eb062029
3 changed files with 8 additions and 5 deletions
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7
arch/x86/kvm/lapic.c
View File

@ -1389,13 +1389,16 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
return vector;
}
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
struct kvm_lapic *apic = vcpu->arch.apic;
kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
/* set SPIV separately to get count of SW disabled APICs right */
apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
kvm_apic_set_version(vcpu);
apic_set_spiv(apic, kvm_apic_get_reg(apic, APIC_SPIV));
apic_update_ppr(apic);
hrtimer_cancel(&apic->lapic_timer.timer);

3
arch/x86/kvm/lapic.h
View File

@ -54,7 +54,8 @@ int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu);
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s);
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);

3
arch/x86/kvm/x86.c
View File

@ -2348,8 +2348,7 @@ static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
kvm_apic_post_state_restore(vcpu);
kvm_apic_post_state_restore(vcpu, s);
update_cr8_intercept(vcpu);
return 0;