Commit a4fa1635 authored May 03, 2012 by Gleb Natapov Committed by Avi Kivity May 06, 2012

KVM: ensure async PF event wakes up vcpu from halt

If vcpu executes hlt instruction while async PF is waiting to be delivered
vcpu can block and deliver async PF only after another even wakes it
up. This happens because kvm_check_async_pf_completion() will remove
completion event from vcpu->async_pf.done before entering kvm_vcpu_block()
and this will make kvm_arch_vcpu_runnable() return false. The solution
is to make vcpu runnable when processing completion.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent 95f71472

arch/x86/kvm/x86.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -6581,6 +6581,7 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
		kvm_inject_page_fault(vcpu, &fault);
		}
		vcpu->arch.apf.halted = false;
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
		}

		bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)

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