Re: [PATCH v2] backends/vhost-user: remove the ioeventfd check

[Stefan Hajnoczi]

On Mon, 30 Jan 2023 at 07:48, Alex Bennée <alex.bennee@linaro.org> wrote:
>
> While ioeventfds are needed for good performance with KVM guests it
> should not be a gating requirement. We can run vhost-user backends using
> simulated ioeventfds or inband signalling.
>
> With this change I can run:
>
>   $QEMU $OPTS \
>     -display gtk,gl=on \
>     -device vhost-user-gpu-pci,chardev=vhgpu \
>     -chardev socket,id=vhgpu,path=vhgpu.sock
>
> with:
>
>   ./contrib/vhost-user-gpu/vhost-user-gpu \
>     -s vhgpu.sock \
>     -v
>
> and at least see things start-up - although the display gets rotated by
> 180 degrees. Once lightdm takes over we never make it to the login
> prompt and just get a blank screen.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Message-Id: <20221202132231.1048669-1-alex.bennee@linaro.org>
>
> ---
> v2
>   - reword commit message to make it clear we simulate ioeventfd
>   - drop check altogether as we can fallback for KVM as well
> ---
>  backends/vhost-user.c | 11 -----------
>  1 file changed, 11 deletions(-)

Nice!

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>