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vfio/pci: Add a separate option for IGD OpRegion support

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The IGD OpRegion is enabled automatically when running in legacy mode,
but it can sometimes be useful in universal passthrough mode as well.
Without an OpRegion, output spigots don't work, and even though Intel
doesn't officially support physical outputs in UPT mode, it's a
useful feature.  Note that if an OpRegion is enabled but a monitor is
not connected, some graphics features will be disabled in the guest
versus a headless system without an OpRegion, where they would work.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Alex Williamson 2016-05-26 09:43:22 -06:00
parent c4c45e943e
commit 6ced0bba70
3 changed files with 39 additions and 2 deletions
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4
hw/vfio/pci-quirks.c
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@ -1055,8 +1055,8 @@ typedef struct VFIOIGDQuirk {
* the table and to write the base address of that memory to the ASLS register
* of the IGD device.
*/
static int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info)
int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info)
{
int ret;