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hw/virtio: incorporate backend features in features 

There are some extra bits used over a vhost-user connection which are
hidden from the device itself. We need to set them here to ensure we
enable things like the protocol extensions.

Currently net/vhost-user.c has it's own inscrutable way of persisting
this data but it really should live in the core vhost_user code.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220726192150.2435175-7-alex.bennee@linaro.org>
Message-Id: <20220802095010.3330793-2-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Alex Bennée 2022-08-02 10:49:49 +01:00 committed by Michael S. Tsirkin
parent f1d33f55c4
commit 02b61f38d3
1 changed files with 8 additions and 1 deletions
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9
hw/virtio/vhost-user.c
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@ -1460,7 +1460,14 @@ static int vhost_user_set_features(struct vhost_dev *dev,
*/ */
bool log_enabled = features & (0x1ULL << VHOST_F_LOG_ALL); bool log_enabled = features & (0x1ULL << VHOST_F_LOG_ALL);
return vhost_user_set_u64(dev, VHOST_USER_SET_FEATURES, features, /*
* We need to include any extra backend only feature bits that
* might be needed by our device. Currently this includes the
* VHOST_USER_F_PROTOCOL_FEATURES bit for enabling protocol
* features.
*/
return vhost_user_set_u64(dev, VHOST_USER_SET_FEATURES,
features | dev->backend_features,
log_enabled); log_enabled);
} }