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Re: [PATCH 1/2] KVM: x86: disable MPX if host did not enable MPX XSAVE features

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  Re: [PATCH 1/2] KVM: x86: disable MPX if host did not enable MPX  XSAVE features Paolo Bonzini <pbonzini@redhat.com> - 2016-03-24 14:10 +0100

#1364142 — Re: [PATCH 1/2] KVM: x86: disable MPX if host did not enable MPX XSAVE features

On 24/03/2016 14:06, Yang Zhang wrote:
> 
> I mean why not keep the old way that only activate the eager_fpu while
> guest sees the MPX bit in CPUID, like:
> 
> vcpu->arch.eager_fpu = use_eager_fpu() && guest_cpuid_has_mpx(vcpu);

If the host uses eager FPU you can assume that it's faster than lazy FPU.

Paolo

> Besides, vmx_fpu_activate is called when do vcpu_reset. So it seems no
> need to call fpu_activate() here again.

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