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| author |   Jason Wang <jasowang@redhat.com> | 2022-06-22 09:29:40 +0800 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2022-06-24 02:49:48 -0400 |
| commit | c346dae4f3fbce51bbd4f2ec5e8c6f9b91e93163 (patch) | |
| tree | 4e3a09595a5ec554cf002679c587049c627fba49 /include/linux/virtio_config.h | |
| parent | virtio: Remove unnecessary variable assignments (diff) | |
| download | linux-dev-c346dae4f3fbce51bbd4f2ec5e8c6f9b91e93163.tar.xz linux-dev-c346dae4f3fbce51bbd4f2ec5e8c6f9b91e93163.zip | |
virtio: disable notification hardening by default
We try to harden virtio device notifications in 8b4ec69d7e09 ("virtio:
harden vring IRQ"). It works with the assumption that the driver or
core can properly call virtio_device_ready() at the right
place. Unfortunately, this seems to be not true and uncover various
bugs of the existing drivers, mainly the issue of using
virtio_device_ready() incorrectly.
So let's add a Kconfig option and disable it by default. It gives
us time to fix the drivers and then we can consider re-enabling it.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220622012940.21441-1-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/virtio_config.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 49c7c32815f1..b47c2e7ed0ee 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -257,6 +257,7 @@ void virtio_device_ready(struct virtio_device *dev) WARN_ON(status & VIRTIO_CONFIG_S_DRIVER_OK); +#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION /* * The virtio_synchronize_cbs() makes sure vring_interrupt() * will see the driver specific setup if it sees vq->broken @@ -264,6 +265,7 @@ void virtio_device_ready(struct virtio_device *dev) */ virtio_synchronize_cbs(dev); __virtio_unbreak_device(dev); +#endif /* * The transport should ensure the visibility of vq->broken * before setting DRIVER_OK. See the comments for the transport |