Messages in this thread | | | Date | Fri, 21 Nov 2014 22:58:19 +0100 | From | Paolo Bonzini <> | Subject | Re: [CFT PATCH 2/2] KVM: x86: support XSAVES usage in the host |
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On 21/11/2014 21:06, Andy Lutomirski wrote: >> > + cpuid_count(XSTATE_CPUID, index, >> > + &size, &offset, &ecx, &edx); >> > + memcpy(dest + offset, src, size); > Is this really the best way to do this? cpuid is serializing, so this > is possibly *very* slow.
The data is in arch/x86/kernel/xsave.c, but it is not exported. But this is absolutely not a hotspot.
Paolo
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