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

Avi Kivity
2009-06-22T09:54:26Z

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.

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