KVM: avoid unnecessary wait for a async pf
In current code, it checks async pf completion out of the wait context, like this: if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && !vcpu->arch.apf.halted) r = vcpu_enter_guest(vcpu); else { ...... kvm_vcpu_block(vcpu) ^- waiting until 'async_pf.done' is not empty } kvm_check_async_pf_completion(vcpu) ^- delete list from async_pf.done So, if we check aysnc pf completion first, it can be blocked at kvm_vcpu_block Fixed by mark the vcpu is unhalted in kvm_check_async_pf_completion() path Signed-off-by:Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Acked-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
parent
c7d28c24
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