Re: [Xen-devel] [PATCH] qemu-xen: Intel GPU passthrough, fix OpRegion mapping.

[Jean Guyader <jean.guyader@xxxxxxxxxxxxx>]

On 27/11 04:23, Jean Guyader 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 0xfc).
> 
> 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.
> 

Ian/Allen,

The pending change to hvmloader has been applied already to xen-unstable.
Is the change alright with you?

Jean

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