[vfio-users] passthrough VGA for widespread use?

[Jonathan Scruggs]

The patches apply to Qemu 2.5. You will need to recompile it after applying
the patches. See your distro's help section on working with source files.
You should be able to add these to the RPM/DEP/Ebuild scripts easily. There
are script files inside RPMs and DEBs that tell rpm/deb how to build those
packages, thus editing that will compile the patches in for you and build
the installable RPM/DEB.

The following patches need to be applied in the order listed. They are
taken from Gerd's qemu work branch. He's a qemu developer, btw. ;)
https://www.kraxel.org/cgit/qemu/patch/?id=0d60ce8e719b5c49ba69c42080f7724fc7de5c1f
https://www.kraxel.org/cgit/qemu/patch/?id=f3617dde4efc245313694ec1c48a0c94e3da6632
https://www.kraxel.org/cgit/qemu/patch/?id=94cf5984085d74b3c1fc9bfb2713c3a931d19d08
https://www.kraxel.org/cgit/qemu/patch/?id=caef8b88fecf1496fa5b623aa2c08544726e36f7
https://www.kraxel.org/cgit/qemu/patch/?id=96c8276c04d609e880a0eb01298d73f46585225d
https://www.kraxel.org/cgit/qemu/patch/?id=9e129397cfd6a733fb4c865e1b605c5c1eb07cff
https://www.kraxel.org/cgit/qemu/patch/?id=6c1c299b65af44e1d81142efb944a9b1009ad725
https://www.kraxel.org/cgit/qemu/patch/?id=0767759d388b0f1bdd9b0445b41b4e88bf980ede

For ebuilds, I added this to the qemu ebuild:
# Add input patches
epatch "${FILESDIR}"/${P}-input-01-add-qemu-input.patch
epatch "${FILESDIR}"/${P}-input-02-linux-evdev-support.patch
epatch
"${FILESDIR}"/${P}-input-03-add-option-to-toggle-grab-on-all-devices.patch
epatch
"${FILESDIR}"/${P}-input-04-add-name-strings-for-linux-input-layer-defines.patch
epatch "${FILESDIR}"/${P}-input-05-event-logging-to-stderr.patch
epatch "${FILESDIR}"/${P}-input-06-catch-and-handle-read-errors.patch
# epatch "${FILESDIR}"/${P}-input-07-adapt-to-qapi-changes.patch <-- needs
development branch to work. Don't use.
epatch "${FILESDIR}"/${P}-input-08-EAGAIN-is-not-fatal.patch
epatch
"${FILESDIR}"/${P}-input-09-add-switch-to-enable-auto-repeat-events.patch

Then in my libvirt xml file, I enabled qemu direct commandline control:
  <qemu:commandline>
    <qemu:arg value='-input-linux'/>
    <qemu:arg
value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.0-event-kbd,grab-all=on,repeat=on'/>
    <qemu:arg value='-input-linux'/>
    <qemu:arg
value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.1-event-mouse'/>
    <qemu:arg value='-input-linux'/>
    <qemu:arg
value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.2-event-joystick'/>
  </qemu:commandline>

The Joystick is actually the keypad. I have a Microsoft sculpt set that
comes with three separate pieces.
Replace your keyboard and mouse with the correct paths in the
/dev/input/by-path section.

It will be cool when the execute program on switch is added, then just
pressing both CTRL keys will switch monitor inputs as well!

Jon

On 1 March 2016 at 12:43, thibaut noah <thibaut.noah at gmail.com> wrote:

>
> 2016-03-01 11:08 GMT+01:00 Jonathan Scruggs <j.scruggs at gmail.com>:
>
>> I have no lag. The patches make the keyboard/mouse directly available on
>> the guest as a real device. This way I have one keyboard and mouse for both
>> host and guest. The technical bit is that the input buffers are forwarded
>> to the guest. Synergy is nice but there is lag with that. These patches are
>> real time! I play the latest AAA games too. I haven't noticed anything. It
>> doesn't hurt to try. I can post my libvirt config if need be. I'll need to
>> get the git address of the latest version.
>
>
> That is pretty much why my synergy server is on the guest, but i have to
> swift my mouse every time i boot, not good for the usb ports.
> Are the patches applied with patch -p1?
> No kernel recompilation needed?
> If so could you copy paste them please?
> That would be indeed glorious, and free 2ports on my usb controller (also
> i have usb ports dedicated to gaming periph on my motherboard)
>
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