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

[Jean Guyader <jean.guyader@xxxxxxxxxxxxx>]

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(-)

Attachment: 0001-hvmloader-Intel-GPU-passthrough-reverse-OpRegion.patch
Description: Text Data

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