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

[Paolo Bonzini <pbonzini@redhat.com>]

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@redhat.com>
> 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.

Paolo

> I should add that this problem is time sensitive because is a blocker
> for the Xen 4.4 release (Xen is in RC2 right now).
>
> Thanks for your feedback,