On Sun, Sep 19, 2010 at 07:29:41PM +0200, Joerg Roedel wrote: > On Sun, Sep 19, 2010 at 06:41:27PM +0200, Gleb Natapov wrote: > > Nested SVM checks for external interrupt after injecting nested exception. > > In case there is external interrupt pending the code generates "external > > interrupt exit" and overwrites previous exit info. If previously injected > > exception already generated exit it will be lost. > > Right. Have you seen specific mismehavior due to this problem? I am just > curious how you found this :-) Yes. Trying to make async page fault work with nested svm :) It was hard to fix with reproducible test case. I am not dreaming to fix it just by code review. > And another question, can you put the reason for this "if(...) return" > into an comment before the statement? The whole svm-emulation thing is > complicated enough so that we should document it well in the code :-) > Complicated is understatement. Will add a comment. > Joerg > > > > > Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx> > > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c > > index 43f5558..1a1f86b 100644 > > --- a/arch/x86/kvm/svm.c > > +++ b/arch/x86/kvm/svm.c > > @@ -1707,6 +1707,9 @@ static inline bool nested_svm_intr(struct vcpu_svm *svm) > > if (!(svm->vcpu.arch.hflags & HF_HIF_MASK)) > > return false; > > > > + if (svm->nested.exit_required) > > + return false; > > + > > svm->vmcb->control.exit_code = SVM_EXIT_INTR; > > svm->vmcb->control.exit_info_1 = 0; > > svm->vmcb->control.exit_info_2 = 0; > > -- > > Gleb. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
