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backends/vhost-user: remove the ioeventfd check

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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>

Message-Id: <20230130124728.175610-1-alex.bennee@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2023-01-30 12:47:28 +00:00 committed by Michael S. Tsirkin
parent cd69d47cdd
commit e1a0e635c9
1 changed files with 0 additions and 11 deletions
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11
backends/vhost-user.c
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@ -20,12 +20,6 @@
#include "io/channel-command.h" #include "io/channel-command.h"
#include "hw/virtio/virtio-bus.h" #include "hw/virtio/virtio-bus.h"
static bool
ioeventfd_enabled(void)
{
return kvm_enabled() && kvm_eventfds_enabled();
}
int int
vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev, vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
unsigned nvqs, Error **errp) unsigned nvqs, Error **errp)
@ -34,11 +28,6 @@ vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
assert(!b->vdev && vdev); assert(!b->vdev && vdev);
if (!ioeventfd_enabled()) {
error_setg(errp, "vhost initialization failed: requires kvm");
return -1;
}
if (!vhost_user_init(&b->vhost_user, &b->chr, errp)) { if (!vhost_user_init(&b->vhost_user, &b->chr, errp)) {
return -1; return -1;
} }