On Tue, Jun 14, 2016 at 10:21:41AM +0200, Paolo Bonzini wrote: > > > On 14/06/2016 07:01, Chao Peng wrote: > >> > > >> > Which are the CPUID leaves for which KVM_GET_SUPPORTED_CPUID is not > >> > stateless? I cannot find any. > > I have though leaf 0xd, sub leaf 1 is not stateless, as the size of > > xsave buffer(EBX) is based on XCR0 | IA32_XSS. But after looking KVM > > code more carefully, seems I was wrong. The code calculates EBX with the > > host xcr0 but not guest xcr0, nor guest IA32_XSS (not sure if this is > > the correct behavior), so it can always returns constant data on a > > certain machine. > > Indeed, KVM computes the correct value at runtime, but > KVM_GET_SUPPORTED_CPUID runs before there is a value for guest XCR0 or > guest IA32_XSS. Yes, this is the point. > > Thanks, I've queued the patch for QEMU 2.7. Thanks :) Chao -- 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
