lkml.org 
[lkml]   [2010]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 3/10] KVM: MMU: fix direct sp's access corruptted
On 06/29/2010 12:04 PM, Xiao Guangrong wrote:
>
>> Simply replace (*spte& SPTE_NO_DIRTY) with a condition that checks
>> whether sp->access is consistent with gw->pt(e)_access.
>>
>>
> If the guest mapping is writable and it !dirty, we mark SPTE_NO_DIRTY flag in
> the spte, when the next #PF occurs, we just need check this flag and see whether
> gpte's D bit is set, if it's true, we zap this spte and map to the correct sp.
>

My point is, SPTE_NO_DIRTY is equivalent to an sp->role.access check
(the access check is a bit slower, but that shouldn't matter).


>> Can you write a test case for qemu-kvm.git/kvm/test that demonstrates
>> the problem and the fix? It will help ensure we don't regress in this
>> area.
>>
>>
> OK, but allow me do it later :-)
>
>

Sure, but please do it soon.

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



\
 
 \ /
  Last update: 2010-06-29 11:15    [W:0.075 / U:0.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site