In vhost-user-blk, only WCE value can be set back to device in
guest kernel like
echo "write through" > /sys/block/vda/cache_type
So write_config() will only set WCE value from guest kernel to
vhost user side.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Since config space in vhost-user-blk are mostly from backend
device, this change will get config space info from backend
by vhost-user protocol.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
vhost-user-blk has better performance than virtio-blk, so we need
add vhost-user-blk support with SPDK in Rust-based VMMs.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Now that virtio-bindings is a crate part of the rust-vmm project, we
want to rely on this one instead of the local one we had so far.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Regarding vhost-user-net, there are features in avail_features
and acked_features, like VIRTIO_NET_F_MAC which is required by
driver and device to transfer mac address through config space,
but not needed by backend, like ovs+dpdk, so it's necessary to
adjust backend_features based on acked_features before calling
set_features() API.
This fix is to record backend_features in vhost-user-net to avoid
requesting it twice.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
New event is added in VhostUserEpollHandler for vhost-user fs,
but the total event count is not update accordingly. Fix the
issue and refactor the event data setting for new event
expansion in the future.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
At this point in the code, the acked features have been provided by the
guest and they can be set back to the backend. There's no need to
retrieve one more time the backend features for this purpose.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
As mentioned in the vhost-user specification, each ring is initialized
in a stopped state. This means each ring should be enabled only after
it has been correctly initialized.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The available features are masked with the backend features, therefore
the available features should be the one used when calling into
set_features() API.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to factorize the code between vhost-user-net and virtio-fs one
step further, this patch extends the vhost-user handler implementation
to support slave requests.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This patch factorizes the existing virtio-fs code by relying onto the
common code part of the vhost_user module in the vm-virtio crate.
In details, it factorizes the vhost-user setup, and reuses the error
types defined by the module instead of defining its own types.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
vhost-user-net introduced a new module vhost_user inside the vm-virtio
crate. Because virtio-fs is actually vhost-user-fs, it belongs to this
new module and needs to be moved there.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
vhost-user framwork could provide good performance in data intensive
scenario due to the memory sharing mechanism. Implement vhost-user-net
device to get the benefit for Rust-based VMMs network.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
