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Date: Fri, 21 Nov 2014 22:58:19 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, stable@...r.kernel.org Subject: Re: [CFT PATCH 2/2] KVM: x86: support XSAVES usage in the host 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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