2016-09-22 07:43+0800, Wanpeng Li: > From: Wanpeng Li <wanpeng.li@xxxxxxxxxxx> > > I observed that kvmvapic(to optimize flexpriority=N or AMD) is used > to boost TPR access when testing kvm-unit-test/eventinj.flat tpr case > on my haswell desktop (w/ flexpriority, w/o APICv). Commit (8d14695f9542 > x86, apicv: add virtual x2apic support) disable virtual x2apic mode > completely if w/o APICv, and the author also told me that windows guest > can't enter into x2apic mode when he developed the APICv feature several > years ago. However, it is not truth currently, Interrupt Remapping and > vIOMMU is added to qemu and the developers from Intel test windows 8 can > work in x2apic mode w/ Interrupt Remapping enabled recently. > > This patch enables TPR shadow for virtual x2apic mode to boost > windows guest in x2apic mode even if w/o APICv. > > Can pass the kvm-unit-test. > > Suggested-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> > Suggested-by: Wincy Van <fanwenyi0529@xxxxxxxxx> > Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> > Cc: Wincy Van <fanwenyi0529@xxxxxxxxx> > Cc: Yang Zhang <yang.zhang.wz@xxxxxxxxx> > Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx> > --- Applied to kvm/queue, thanks. -- 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
