If the guest executes the following code sequence CLI ... (interrupt becomes pending) STI HLT
then we will exit on HLT, enter the guest, and exit immediately again on virtual interrupt pending. As this is wasteful, this patch set short circuits the whole operation to inject the interrupt immediately. (as I've seen this occur very rarely in ftrace, compared to what I saw before I wrote the patch, please don't apply patches 2 and 3 until I've had a chance to benchmark it) Avi Kivity (3): KVM: VMX: Cache CPU_BASED_VM_EXEC_CONTROL VMCS field KVM: VMX: Short circuit STI; HLT while an interrupt is pending KVM: SVM: Short circuit STI; HLT while an interrupt is pending arch/x86/kvm/svm.c | 9 +++++++ arch/x86/kvm/vmx.c | 69 ++++++++++++++++++++++++++++----------------------- 2 files changed, 47 insertions(+), 31 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
