Re: [Xen-devel] [PATCH][RESEND] qemu-xen: Intel GPU passthrough, fix OpRegion mapping (v3)

[Jean Guyader <jean.guyader@xxxxxxxxx>]

On 10 May 2012 20:07, Jean Guyader <jean.guyader@xxxxxxxxx> wrote:
> The OpRegion shouldn't be mapped 1:1 because the address in the host
> can't be used in the guest directly.
>
> This patch traps read and write access to the opregion of the Intel
> GPU config space (offset 0x).
>
> To work correctly this patch needs a change in hvmloader.
>
> HVMloader will allocate 2 pages for the OpRegion and write this address
> on the config space of the Intel GPU. Qemu will trap and map the host
> OpRegion to the guest. Any write to this offset after that won't have
> any effect. Any read of this config space offset will return the address
> in the guest.
>
> Signed-off-by: Jean Guyader <jean.guyader@xxxxxxxxxxxxx>

Sorry forgot to say, it was acked by Stefano.

Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel