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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2025-09-22 18:01:47 -0400 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2025-10-05 09:01:08 -0400 |
| commit | 3b11003fa67b3f055637ff52e1fe8327f7590ee1 (patch) | |
| tree | a78dc7d6b6df2113555cf35138b7d0d4d6f61087 | |
| parent | 1e9181dc5277f27fcda21f64a399f12bbf578e5e (diff) | |
| download | focaccia-qemu-3b11003fa67b3f055637ff52e1fe8327f7590ee1.tar.gz focaccia-qemu-3b11003fa67b3f055637ff52e1fe8327f7590ee1.zip | |
virtio: support irqfd in virtio_notify_config()
virtio_error() calls virtio_notify_config() to inject a VIRTIO Configuration Change Notification. This doesn't work from IOThreads because the BQL is not held and the interrupt code path requires the BQL. Follow the same approach as virtio_notify() and use ->config_notifier (an irqfd) when called from the IOThread. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-ID: <20250922220149.498967-4-stefanha@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | hw/virtio/virtio.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 6ce5823898..de89e8104a 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2706,7 +2706,12 @@ void virtio_notify_config(VirtIODevice *vdev) virtio_set_isr(vdev, 0x3); vdev->generation++; - virtio_notify_vector(vdev, vdev->config_vector); + + if (qemu_in_iothread()) { + defer_call(virtio_notify_irqfd_deferred_fn, &vdev->config_notifier); + } else { + virtio_notify_vector(vdev, vdev->config_vector); + } } static bool virtio_device_endian_needed(void *opaque) |