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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Tue, 21 May 2013 04:09:25 +0000, Hanweidong <hanweidong@xxxxxxxxxx> 
wrote:
> > -----Original Message-----
> > From: Gordan Bobic [mailto:gordan@xxxxxxxxxx]
> > Sent: 2013å5æ21æ 2:43
> > To: George Dunlap
> > Cc: Hanweidong; Stefano Stabellini; xudong.hao@xxxxxxxxx; 
> > Yanqiangjun;
> > Luonengjun; Wangzhenguo; Yangxiaowei; Gonglei (Arei); Anthony 
> > Perard;
> > xen-devel@xxxxxxxxxxxxx; xiantao.zhang@xxxxxxxxx
> > Subject: Re: [Xen-devel] GPU passthrough issue when VM is configured
> > with 4G memory
> >
> > I'd also like to stress this is not only an issue for > 4GB of RAM 
> > in
> > domU - I am seeing the issue with > 2GB of RAM in domU.
> What's the total mmio size of you domU?
How can I find that out?

> When RAM of domU overlaps
> with pci_mem_start, hvmloader will relocate RAM, and it will cause
> problem due to hvmloader and QEMU don't setup the memory layout
> consistently. I suspect the mmio size of your domU is close to 2GB.
> When you configured RAM > 2G, then RAM of your domU overlapped with
> pci_mem_start, and resulted in failure.
Is there a way to force a hole between, say, 2GB and 4GB explicitly
to avoid the PCI memory being clobbered?

Gordan

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