Re: [Xen-devel] [BUG] BSoD on Windows XP installation

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 29 Jan 2014, Paolo Bonzini wrote:
> Il 29/01/2014 13:00, Stefano Stabellini ha scritto:
> > Hi Paolo,
> > we have been trying to fix a BSOD that would happen during the Windows
> > XP installation, once every ten times on average.
> > After many days of bisection, we found out that commit
> > 
> > commit 149f54b53b7666a3facd45e86eece60ce7d3b114
> > Author: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> > Date:   Fri May 24 12:59:37 2013 +0200
> > 
> >     memory: add address_space_translate
> > 
> > breaks Xen support in QEMU, in particular the Xen mapcache.
> > The reason is that after this commit, l in address_space_rw can span a
> > page boundary, however qemu_get_ram_ptr still calls xen_map_cache asking
> > to map a single page (if block->offset == 0).
> > The appended patch works around the issue by reverting to the old
> > behaviour.
> > 
> > What do you think is the right fix for this?
> > Maybe we need to add a size parameter to qemu_get_ram_ptr?
> 
> Yeah, that would be best but the patch you attached is fine too with a FIXME
> comment.

Thanks for the quick reply. I have just sent a better and cleaner
version of this patch with a proper commit message and signed-off-by
lines:

http://marc.info/?l=qemu-devel&m=139108598630562&w=2

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