Re: [Xen-devel] [PATCH] VT-d: don't crash when PTE bits 52 and up are non-zero

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.12.14 at 07:52, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: Friday, December 19, 2014 7:26 PM
>> 
>> This can (and will) be legitimately the case when sharing page tables
>> with EPT (more of a problem before p2m_access_rwx became zero, but
>> still possible even now when other than that is the default for a
>> guest), leading to an unconditional crash (in print_vtd_entries())
>> when a DMA remapping fault occurs.
> 
> could you elaborate the scenarios when bits 52+ are non-zero?
> 
>> 
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> but the changes looks reasonable to me.
> 
> Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>

I translated this to a Reviewed-by, as S-o-b doesn't seem to make
sense here.

Konrad - please indicate whether this can also go into 4.5.

Jan


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