Marcelo Tosatti wrote on 2013-01-24: > On Wed, Jan 23, 2013 at 10:47:23PM +0800, Yang Zhang wrote: >> From: Yang Zhang <yang.z.zhang@xxxxxxxxx> >> >> APIC virtualization is a new feature which can eliminate most of VM exit >> when vcpu handle a interrupt: >> >> APIC register virtualization: >> APIC read access doesn't cause APIC-access VM exits. >> APIC write becomes trap-like. >> Virtual interrupt delivery: >> Virtual interrupt delivery avoids KVM to inject vAPIC interrupts >> manually, which is fully taken care of by the hardware. > > Can you provide numbers, and also what tests have been performed. This first patch is adding APIC register virtualization supporting. The second patch is adding enable virtual x2apic mode supporting since it is required by APICv when guest uses msr based way to access APIC. Then third patch is is add virtual interrupt delivery supporting. The test cover booting different guests: include windows 2k3, win7, winxp, rhel6u3, rhel 5u5 and upstream Linux. And also did some scp inside guest and migration. Didn't see any issues. Also, we did some performance measure with previous patch and it shows about 3% ~5% improvement. Best regards, Yang -- 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
