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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jan 07, 2015 at 10:15:39AM +0000, Jan Beulich wrote:
> >>> 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.

Yes. Release-Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> Jan
> 

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