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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Mar 04, 2013 at 08:10:10AM +0000, Gonglei (Arei) wrote:
>    Hi,all
> 

Hello,

>    I have tried to passthrough GPU card(Nvidia quadro 4000) on the latest Xen
>    unstable version (QEMU is using Qemu-upsteam-unstable, not traditional
>    Qemu). This issue as below:
> 

I don't think qemu-upstream has GPU/VGA passthrough support yet.


>           Windows7 64-bit guest will blue screen when GPU passthrough
>    configure 4g memory,blue screen code is 50, and SUSE 11 64-bit guest will
>    always stay at the grub screen.  I noticed that it will relocate RAM that
>    overlaps PCI space in pci_setup()(tools/hvmloader/pci.c). If VM memory is
>    configured with 3G, it won't cause relocate RAM that overlaps PCI space in
>    pci_setup(), and GPU pass-through is no problem. So it seems this issue is
>    related to "relocate RAM" in pci_setup().
> 
>           In the failure case (VM memory is 4G), I used "memtest" to check
>    memory of the VM which configured with more than 4G memory, the last 256M
>    has errors.
> 
> 
> 
>    BTW, Xen 4.1.2 doesn't have this issue.
> 

I assume with Xen 4.1.2 you're using qemu-traditional.. ? 

Try using qemu-traditional also with xen-unstable.

-- Pasi

> 
> 
>    Any ideas about this issue? Thanks in advance.
> 
> 

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