Re: [Xen-devel] [PATCH] hvmloader: Intel GPU passthrough, reverse OpRegion

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 23/11/2011 16:07, "Jean Guyader" <jean.guyader@xxxxxxxxxxxxx> wrote:

> 
> The Intel GPU uses a two pages NVS region called OpRegion.
> In order to get full support for the driver in the guest
> we need to map this region.
> 
> This patch reserves 2 pages on the top of the RAM and
> mark this region as NVS in the e820. Then we write the
> address to the config space (offset 0xfc) so the device
> model can map the OpRegion at this address in the guest.

Please use mem_hole_alloc() rather than adjusting {low,high}_mem_pgend.

Is it correct to do this for *all* gfx devices with Intel vendor id?

 -- Keir

> Signed-off-by: Jean Guyader <jean.guyader@xxxxxxxxxxxxx>
> ---
>  tools/firmware/hvmloader/config.h   |    1 +
>  tools/firmware/hvmloader/e820.c     |    8 ++++++++
>  tools/firmware/hvmloader/pci.c      |   28 ++++++++++++++++++++++++++++
>  tools/firmware/hvmloader/pci_regs.h |    2 ++
>  4 files changed, 39 insertions(+), 0 deletions(-)
> 
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