From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dushyant Bansal <cs5070214@cse.iitd.ac.in>
Date: Wed, 02 Mar 2011 16:46:01 +0000
Subject: Re: Patching instructions with PV versions
Message-Id: <4D6E7179.10109@cse.iitd.ac.in>
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References: <4D68EC7D.3040100@cse.iitd.ac.in>
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To: kvm-ppc@vger.kernel.org

On Monday 28 February 2011 07:43 PM, Sethi Varun-B16395 wrote:
> Hi Dushyant,
> Please refer to the magic page section of the following document:
> linux/Documentation/kvm/ppc-pv.txt
>    
Thanks, now I do have a better understanding.
> Regards
> Varun
> ________________________________________
> From: kvm-ppc-owner@vger.kernel.org [kvm-ppc-owner@vger.kernel.org] on behalf of Dushyant Bansal [cs5070214@cse.iitd.ac.in]
> Sent: Saturday, February 26, 2011 5:35 PM
> To: kvm-ppc@vger.kernel.org
> Subject: Patching instructions with PV versions
>
> Hi,
>       I understand that in order to improve performance by reducing vm
> exits, kvm uses one shared page between kvm and guest. Now, guest can
> map this page and access its fields using load, store instructions.
> Then, it patches instructions with their paravirtualized versions
> (inside kvm_use_magic_page). I have a few questions.
>    Is patching, by default enabled for every guest?
>    When is this patching done? Does it target only guest kernel code?
>
> Thanks,
> Dushyant
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