linux-kernel - Re: [PATCH] kvm: vmx: Use the hardware provided GPA instead of page walk

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Message-ID: <3a4399fa-ad9b-c728-2c64-72213685ca28@redhat.com>
Date:   Wed, 8 Feb 2017 09:16:12 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] kvm: vmx: Use the hardware provided GPA instead of page
 walk



On 07/02/2017 21:52, Radim Krčmář wrote:
> 2017-01-27 19:34+0100, Paolo Bonzini:
>> As in the SVM patch, the guest physical address is passed by
>> VMX to x86_emulate_instruction already, so mark the GPA as available
>> in vcpu->arch.
>>
>> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
>> ---
> 
> In line with the SVM patch,
> 
> Reviewed-by: Radim Krčmář <rkrcmar@...hat.com>
> 
> Still, I don't see why we need a variable that is touched on every VM
> exit.  Is this a mere shortcut to propagating the gpa_available bit with
> the gpa argument to kvm_mmu_page_fault() and x86_emulate_instruction()?

Yes, pretty much.

Paolo