Commit 0669a510 authored Oct 30, 2015 by Radim Krčmář Committed by Paolo Bonzini Nov 04, 2015

KVM: x86: zero apic_arb_prio on reset



BSP doesn't get INIT so its apic_arb_prio isn't zeroed after reboot.
BSP won't get lowest priority interrupts until other VCPUs get enough
interrupts to match their pre-reboot apic_arb_prio.

That behavior doesn't fit into KVM's round-robin-like interpretation of
lowest priority delivery ... userspace should KVM_SET_LAPIC on reset, so
just zero apic_arb_prio there.

Reported-by: Yuki Shibuya <shibuya.yk@ncos.nec.co.jp>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent c75efa97

arch/x86/kvm/lapic.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1918,6 +1918,8 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
		kvm_make_request(KVM_REQ_EVENT, vcpu);
		if (ioapic_in_kernel(vcpu->kvm))
		kvm_rtc_eoi_tracking_restore_one(vcpu);

		vcpu->arch.apic_arb_prio = 0;
		}

		void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)

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