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virtio: support irqfd in virtio_notify_config()

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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>
This commit is contained in:
Stefan Hajnoczi
2025-10-05 09:01:08 -04:00
committed by Michael S. Tsirkin
parent 1e9181dc52
commit 3b11003fa6
1 changed files with 6 additions and 1 deletions
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hw/virtio/virtio.c
+6 -1
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@@ -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)