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svm: Fix AVIC incomplete IPI emulation

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In case of incomplete IPI with invalid interrupt type, the current
SVM driver does not properly emulate the IPI, and fails to boot
FreeBSD guests with multiple vcpus when enabling AVIC.

Fix this by update APIC ICR high/low registers, which also
emulate sending the IPI.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2019-01-22 10:25:13 +00:00 committed by Paolo Bonzini
parent 37ef0c4414
commit bb218fbcfa
1 changed files with 4 additions and 15 deletions
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19
arch/x86/kvm/svm.c
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@ -4504,25 +4504,14 @@ static int avic_incomplete_ipi_interception(struct vcpu_svm *svm)
kvm_lapic_reg_write(apic, APIC_ICR, icrl);
break;
case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING: {
int i;
struct kvm_vcpu *vcpu;
struct kvm *kvm = svm->vcpu.kvm;
struct kvm_lapic *apic = svm->vcpu.arch.apic;
/*
* At this point, we expect that the AVIC HW has already
* set the appropriate IRR bits on the valid target
* vcpus. So, we just need to kick the appropriate vcpu.
* Update ICR high and low, then emulate sending IPI,
* which is handled when writing APIC_ICR.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
bool m = kvm_apic_match_dest(vcpu, apic,
icrl & KVM_APIC_SHORT_MASK,
GET_APIC_DEST_FIELD(icrh),
icrl & KVM_APIC_DEST_MASK);
if (m && !avic_vcpu_is_running(vcpu))
kvm_vcpu_wake_up(vcpu);
}
kvm_lapic_reg_write(apic, APIC_ICR2, icrh);
kvm_lapic_reg_write(apic, APIC_ICR, icrl);
break;
}
case AVIC_IPI_FAILURE_INVALID_TARGET: