Alan Jenkins reports hang at https://bugzilla.redhat.com/show_bug.cgi?id=1337667. * APIC write: expiration = 1000. * LAPIC tsc deadline code sets timer to 1000-30. * Timer fires at 970. * Guest writes TSC=w. Guest fails to VM-entry to process signal to perform "vmload" in userspace. Case 1: w > 970: Guest entry can be performed. Case 2: w < 970: Guest entry should not be performed because "An interrupt is generated when the logical processor’s time-stamp counter equals or exceeds the target value in the IA32_TSC_DEADLINE MSR." Setting of APIC test resets all APIC state, including any pending interrupts. Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ea306ad..89be6e9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2991,6 +2991,7 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, { kvm_apic_post_state_restore(vcpu, s); update_cr8_intercept(vcpu); + vcpu->arch.apic->lapic_timer.expired_tscdeadline = 0; return 0; } -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
