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

[Pasi Kärkkäinen <pasik@xxxxxx>]

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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