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

[Jean Guyader <jean.guyader@xxxxxxxxx>]

The description was slightly wrong, here is a new one:

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 memory in the
reserved area 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.

Signed-off-by: Jean Guyader <jean.guyader@xxxxxxxxxxxxx>

On 24 November 2011 14:53, 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.
>
> Signed-off-by: Jean Guyader <jean.guyader@xxxxxxxxxxxxx>
> ---
>  tools/firmware/hvmloader/config.h   |    1 +
>  tools/firmware/hvmloader/e820.c     |   34 ++++++++++++++++++++++++++++++----
>  tools/firmware/hvmloader/pci.c      |   14 ++++++++++++++
>  tools/firmware/hvmloader/pci_regs.h |    2 ++
>  4 files changed, 47 insertions(+), 4 deletions(-)
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
>

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