[RFC PATCH v2 0/3] drm/i915/gvt: Enable vGPU local display direct flip

[Gerd Hoffmann]

  Hi,

> > Creating a lease doesn't work here.
> > 
> > kernel is 5.1.5.  xorg server is is 1.20.4, reporting xrandr version 1.6.  Which
> > should be new enough.
> This is our referenced versions:
> Kernel: 5.2.0 (however 5.1.5 should also work) 
> Xorg: 1.20.4 reporting xrandr version 1.6
> Libxcb: 1.13
> Xcb-proto: 1.13
> Xorgproto: 2018.4-4
> Libdrm: 2.4.95
> 
> Also, you can reference the status of drm leases support:
> https://haagch.frickel.club/#!drmlease.md

Ah, the non-desktop property looks important.

Turned output off (xrandr --output HDMI-2 --off).
Set non-desktop property (xrandr --output HDMI-2 --set non-desktop 1).
Updated qemu code to look for non-desktop outputs.

Still not working :-(

> When you tried this work
> https://github.com/intel/Igvtg-qemu/commit/2881d9a65beb319c42b947d23eb1d260224bcddc,
> did you add "enable-drmlease=on" mentioned in the commit message?

Using https://git.kraxel.org/cgit/qemu/log/?h=sirius/display-drm, I get this:

# qemu-system-x86_64 -display drm,enable-drmlease=on
qemu-system-x86_64: info: drm-lease: screen is 0
qemu-system-x86_64: info: drm-lease: root window is 0x15d
qemu-system-x86_64: info: drm-lease: xrandr: major-opcode 140, first-error 147, first-event 89
qemu-system-x86_64: info: drm-lease: xrandr: client v1.6, server v1.6
qemu-system-x86_64: info: drm-lease: xrandr:   output 0x42: name HDMI-1, non-desktop 0
qemu-system-x86_64: info: drm-lease: xrandr:   output 0x43: name HDMI-2, non-desktop 1
qemu-system-x86_64: info: drm-lease: xrandr:   output 0x44: name DP-1, non-desktop 0
qemu-system-x86_64: info: drm-lease: xrandr: using output 0x43
qemu-system-x86_64: info: drm-lease: xrandr: using crtc 0x40
qemu-system-x86_64: drm-lease: xrandr: create lease failed: BadMatch (code 8, op 140:45)

Hmm.

cheers,
  Gerd