linux-kernel - Re: [PATCH 0/8 v3] KVM support for 1GB pages

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Message-ID: <4A3F54F9.9060506@redhat.com>
Date:	Mon, 22 Jun 2009 12:55:05 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <marcelo@...ck.org>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8 v3] KVM support for 1GB pages

On 06/22/2009 12:49 PM, Joerg Roedel wrote:
>>> After the rework it even fails to boot a guest with gbpages enabled. This week
>>> is a bit tight but I will debug this further next week.
>>>
>>>        
>> Does the failure happen only when both guest/host use gbpages, or does
>> it also happen if gbpages is disabled on either one?
>>      
>
> It happens only when the guest uses gbpages. If I disable them at boot the
> linux guest boots fine and runs stable.
>    

This seems to point the finger at the write protection logic, either we 
create a gbpage even though there are shadowed page tables in its area, 
or (more likely) we don't break up a gbpage when we write protect a page.

-- 
error compiling committee.c: too many arguments to function

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