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

To: Anthony Perard <anthony.perard@xxxxxxxxxx>
Subject: Re: [Xen-devel] bug, bad page free with hvm guest after commits about AMD IOMMU
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Thu, 5 May 2011 15:44:36 +0100
Cc: Wei Wang <wei.wang2@xxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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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

Does the attached patch fix it for you?  I'm still seeing intermittent
failures with it but they may be unrelated. 


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

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