From 64eb0620296f924d5fded755c5ed95fb73649e06 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Wed, 8 Aug 2012 15:24:36 +0300 Subject: [PATCH] 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/lapic.c | 7 +++++-- arch/x86/kvm/lapic.h | 3 ++- arch/x86/kvm/x86.c | 3 +-- 3 files changed, 8 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 333c27f..18d149d 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -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); diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index 2ad9caa..615a8b0 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -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); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8ebf65c..91a5958 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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; -- 2.7.4