linux-kernel - Re: [PATCH v2] KVM: x86: Avoid guest page table walk when gpa

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Date:   Wed, 19 Jul 2017 08:35:31 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     brijesh.singh@....com, pbonzini@...hat.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, Thomas.Lendacky@....com
Subject: Re: [PATCH v2] KVM: x86: Avoid guest page table walk when
 gpa_available is set



On 07/19/2017 06:19 AM, Radim Krčmář wrote:
> 2017-07-17 16:32-0500, Brijesh Singh:
>> Hi Paolo and Radim
>>
>> Any comments on this patch, I could not find it in 4.13-2 branch.
>>
>> Please let me know if you want to fix something, or want me to
>> refresh and resend the patch.
> 
> Sorry, I tried it during the merge window, but it didn't pass tests on
> VMX and I got distracted by other bugs before looking into the cause.
> 
> Can you reproduce the fail?
> 

No worries, thanks.

I can try to reproduce it, are you running kvm-unittest or something different?

IIRC, VMX does not set the gpa_available flag hence I am wondering what did I miss
in the patch to trigger the failure. I will debug it and let you know.

-Brijesh