Re: [Xen-devel] bug, bad page free with hvm guest after commits about AMD IOMMU

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 16:31 +0100 on 05 May (1304613096), Anthony Perard wrote:
> On Thu, 5 May 2011, Tim Deegan wrote:
> 
> > CC'ing John and George, who reported similar-sounding failures.
> >
> > At 14:56 +0100 on 05 May (1304607375), Anthony Perard wrote:
> > > On Thu, May 5, 2011 at 14:40, Tim Deegan <Tim.Deegan@xxxxxxxxxx> wrote:
> > > > At 14:31 +0100 on 05 May (1304605909), Anthony PERARD wrote:
> > > >> Hi,
> > > >>
> > > >> With the last xen-unstable, when I try to run a HVM guest, the vgabios
> > > >> did not display anything on the screen (it is only white), and Xen
> > > >> print this:
> > > >
> > > > Interesting.  I get those messages but the BIOS continues OK so I hadn't
> > > > been in a hurry to investigate.  I'll take a look.
> > >
> > > Yes, the guest works fine after that, but on linux, there is no vga
> > > console, but a X server work fine.
> >
> > I suspect it's the use of type 0 to mean RAM: it means that an entry of
> > all zeroes no longer gives type mmio so something's not going to qemu
> > correctly.
> >
> > Does the attached patch fix it for you?  I'm still seeing intermittent
> > failures with it but they may be unrelated.
> 
> Yep, the patch fix this issue.

Great, thanks for the triage and testing.  I've applied it. 

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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