linux-kernel - Re: [PATCH][v2 3/3] KVM: x86: Use FPU API

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Message-ID: <4BF10E59.1090200@redhat.com>
Date:	Mon, 17 May 2010 12:37:29 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Sheng Yang <sheng@...ux.intel.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][v2 3/3] KVM: x86: Use FPU API

On 05/17/2010 12:08 PM, Sheng Yang wrote:
> Convert KVM to use generic FPU API.
>
>   void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
>   {
>   	if (vcpu->guest_fpu_loaded)
> @@ -5156,7 +5134,7 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
>
>   	vcpu->guest_fpu_loaded = 1;
>   	unlazy_fpu(current);
> -	kvm_fx_restore(&vcpu->arch.guest_fx_image);
> +	fpu_restore_checking(&vcpu->arch.guest_fpu);
>   	trace_kvm_fpu(1);
>   }
>    

Do we need to do something on error here?

I think an error can only occur if userspace sets bad fpu state, so 
maybe do the check in the ioctl.

In any case, unrelated to this patch.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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