2017-06-14 19:26-0700, Wanpeng Li: > From: Wanpeng Li <[email protected]> > > Add an async_page_fault field to vcpu->arch.exception to identify an async > page fault, and constructs the expected vm-exit information fields. Force > a nested VM exit from nested_vmx_check_exception() if the injected #PF > is async page fault. > > Cc: Paolo Bonzini <[email protected]> > Cc: Radim Krčmář <[email protected]> > Signed-off-by: Wanpeng Li <[email protected]> > --- > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > @@ -452,7 +452,11 @@ EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); > void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception > *fault) > { > ++vcpu->stat.pf_guest; > - vcpu->arch.cr2 = fault->address; > + vcpu->arch.exception.async_page_fault = fault->async_page_fault;
I think we need to act as if arch.exception.async_page_fault was not pending in kvm_vcpu_ioctl_x86_get_vcpu_events(). Otherwise, if we migrate with pending async_page_fault exception, we'd inject it as a normal #PF, which could confuse/kill the nested guest. And kvm_vcpu_ioctl_x86_set_vcpu_events() should clean the flag for sanity as well. Thanks.
