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.
Unified · Split
| @@ -4504,25 +4504,14 @@ static int avic_incomplete_ipi_interception(struct vcpu_svm *svm) · 4503 unmodified lines | ||
| 4504 | 4504 | kvm_lapic_reg_write(apic, APIC_ICR, icrl); |
| 4505 | 4505 | break; |
| 4506 | 4506 | case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING: { |
| 4507 | − int i; | |
| 4508 | − struct kvm_vcpu *vcpu; | |
| 4509 | − struct kvm *kvm = svm->vcpu.kvm; | |
| 4510 | 4507 | struct kvm_lapic *apic = svm->vcpu.arch.apic; |
| 4511 | 4508 | |
| 4512 | 4509 | /* |
| 4513 | − * At this point, we expect that the AVIC HW has already | |
| 4514 | − * set the appropriate IRR bits on the valid target | |
| 4515 | − * vcpus. So, we just need to kick the appropriate vcpu. | |
| 4510 | + * Update ICR high and low, then emulate sending IPI, | |
| 4511 | + * which is handled when writing APIC_ICR. | |
| 4516 | 4512 | */ |
| 4517 | − kvm_for_each_vcpu(i, vcpu, kvm) { | |
| 4518 | − bool m = kvm_apic_match_dest(vcpu, apic, | |
| 4519 | − icrl & KVM_APIC_SHORT_MASK, | |
| 4520 | − GET_APIC_DEST_FIELD(icrh), | |
| 4521 | − icrl & KVM_APIC_DEST_MASK); | |
| 4522 | − | |
| 4523 | − if (m && !avic_vcpu_is_running(vcpu)) | |
| 4524 | − kvm_vcpu_wake_up(vcpu); | |
| 4525 | − } | |
| 4513 | + kvm_lapic_reg_write(apic, APIC_ICR2, icrh); | |
| 4514 | + kvm_lapic_reg_write(apic, APIC_ICR, icrl); | |
| 4526 | 4515 | break; |
| 4527 | 4516 | } |
| 4528 | 4517 | case AVIC_IPI_FAILURE_INVALID_TARGET: |