Re: [Xen-devel] GPU passthrough issue when VM is configured with 4G memory

[David TECHER <davidtecher@xxxxxxxx>]

Those patches works fine for me with my ATI card both for Windows 7 64 bit or Linux Mint 14 64-Bit.

Both were tested with 6GB and 8GB of RAM and vcpus = 6

To do 'make stubdom' I have to find a way to neuter iopl() call from tools/qemu-xen-traditional-dir-remote/hw/pt-graphics.c

All details provided here

http://www.davidgis.fr/blog/index.php?2013/04/05/937-xen-43-unstable-vga-passthrough-hd-7970-windows-7-64-bits-with-more-than-3gb-for-ram

---

De : Pasi Kärkkäinen <pasik@xxxxxx>
À : Hanweidong <hanweidong@xxxxxxxxxx>
Cc : Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>; George Dunlap <George.Dunlap@xxxxxxxxxxxxx>; "xudong.hao@xxxxxxxxx" <xudong.hao@xxxxxxxxx>; Yanqiangjun <yanqiangjun@xxxxxxxxxx>; Luonengjun <luonengjun@xxxxxxxxxx>; Wangzhenguo <wangzhenguo@xxxxxxxxxx>; Yangxiaowei <xiaowei.yang@xxxxxxxxxx>; Gonglei (Arei) <arei.gonglei@xxxxxxxxxx>; Anthony Perard <anthony.perard@xxxxxxxxxx>; "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>; "xiantao.zhang@xxxxxxxxx" <xiantao.zhang@xxxxxxxxx>
Envoyé le : Lundi 15 avril 2013 23h22
Objet : Re: [Xen-devel] GPU passthrough issue when VM is configured with 4G memory

On Tue, Mar 26, 2013 at 09:37:53AM +0000, Hanweidong wrote:
> > >
> > > HVM_BELOW_4G_RAM_END is f0000000. If we change HVM_BELOW_4G_RAM_END
> > to e0000000,
> > > Which it's consistent with hvmloader when assigning a GPU, and then
> > guest worked
> > > for us. So we wondering that xen_ram_init in QEMU should be
> > consistent with
> > > hvmloader.
> > >
> > > In addition, we found QEMU uses hardcode 0xe0000000 in pc_init1() as
> > below.
> > > Should keep these places handle the consistent mmio hole or not?
> > >
> > >    if (ram_size >= 0xe0000000 ) {
> > >        above_4g_mem_size = ram_size - 0xe0000000;
> > >        below_4g_mem_size = 0xe0000000;
> > >    } else {
> > >        above_4g_mem_size = 0;
> > >        below_4g_mem_size = ram_size;
> > >    }
> >
> > The guys at Intel sent a couple of patches recently to fix this issue:
> >
> > http://marc.info/?l=xen-devel&m=136150317011027
> > http://marc.info/?l=qemu-devel&m=136177475215360&w=2
> >
> > Do they solve your problem?
>
> These two patches didn't solve our problem.
>

Any updates on this? It'd be nice to get this fixed before Xen 4.3.

Thanks,

-- Pasi

> --weidong
>
> >
> > Xudong and Xiantao,
> > are you going to send an update of the second patch to QEMU?


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