The new virtio-queue version introduced some breaking changes which need
to be addressed so that Cloud Hypervisor can still work with this
version.
The most important change is about removing a handle to the guest memory
from the Queue, meaning the caller has to provide the guest memory
handle for multiple methods from the QueueT trait.
One interesting aspect is that QueueT has been widely extended to
provide every getter and setter we need to access and update the Queue
structure without having direct access to its internal fields.
This patch ports all the virtio and vhost-user devices to this new crate
definition. It also updates both vhost-user-block and vhost-user-net
backends based on the updated vhost-user-backend crate. It also updates
the fuzz directory.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This check is new in the beta version of clippy and exists to avoid
potential deadlocks by highlighting when the test in an if or for loop
is something that holds a lock. In many cases we would need to make
significant refactorings to be able to pass this check so disable in the
affected crates.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Instead of relying on the local version of vhost-user-backend, this
patch allows the block backend implementation to rely on the upstream
version of the crate from rust-vmm.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since we're trying to move away from the translation happening in the
virtio-queue crate, the device itself is performing the address
translation when needed.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Relying on the vm-virtio/virtio-queue crate from rust-vmm which has been
copied inside the Cloud Hypervisor tree, the entire codebase is moved to
the new definition of a Queue and other related structures.
The reason for this move is to follow the upstream until we get some
agreement for the patches that we need on top of that to make it
properly work with Cloud Hypervisor.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
These crates are written to produce log messages using the error!
macro, but their logs didn't actually go anywhere, which made it very
difficult to debug when they're not working.
I've used env_logger here because it's the same log implementation
that the hypervisor crate uses.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
I don't think the min_values(1) was doing anything, since
takes_value(true) was already set, and after this change I still get
an error if I try to supply the argument with no value.
But the unwrap below would fail if the argument wasn't supplied at
all. By setting required(true) we get a nice message from clap
instead.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
We didn't implement the vhost-user-net backend to support EVENT_IDX
feature, hence it is incorrect to advertise VIRTIO_RING_F_EVENT_IDX to
the VMM and the guest.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
If writing to the TAP returns EAGAIN then listen for the TAP to be
writable. When the TAP becomes writable attempt to process the TX queue
again.
Fixes: #2807
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
As the first step to complete live-migration with tracking dirty-pages
written by the VMM, this commit patches the dependent vm-memory crate to
the upstream version with the dirty-page-tracking capability. Most
changes are due to the updated `GuestMemoryMmap`, `GuestRegionMmap`, and
`MmapRegion` structs which are taking an additional generic type
parameter to specify what 'bitmap backend' is used.
The above changes should be transparent to the rest of the code base,
e.g. all unit/integration tests should pass without additional changes.
Signed-off-by: Bo Chen <chen.bo@intel.com>
We recently realized the control queue is not meant to be handled by the
backend, that's why we move it out of vhost-user-net implementation.
Revert "vhost_user_net: Handle control queue"
This reverts commit af88ff1c49.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Extend the current list of available virtio features in order to make it
work correctly with the VMM side.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The virtio-net control queue must be handled by the backend, the same
way all other queues already are.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Now all crates use edition = "2018" then the majority of the "extern
crate" statements can be removed. Only those for importing macros need
to remain.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Relying on latest changes from vhost_user_backend crate, this patch
enables the client mode support for vhost-user-net backend.
In this mode, the backend behaves as a client instead of the default
mode where it behaves as the server.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The point being to identify clearly that we're running the backend as a
server. This anticipates the addition of a new function for running the
backend as a client.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In the reference vhost_user_net backend don't advertise the offload
features. For correctness we should only advertise them if we can set
them when they are acked by the guest.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Fixes the current codebase so that every cargo clippy can be run with
the beta toolchain without any error.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to support GET_MAX_MEM_SLOTS, ADD_MEM_REG and REM_MEM_REG, the
protocol feature CONFIGURE_MEM_SLOTS must be enabled.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The vhost crate from rust-vmm is ready, which is why we do the switch
from the Cloud Hypervisor fork to the upstream crate.
At the same time, we rename the crate from vhost_rs to vhost.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The main idea behind this commit is to remove all the complexity
associated with TX/RX handling for virtio-net. By using writev() and
readv() syscalls, we could get rid of intermediate buffers for both
queues.
The complexity regarding the TAP registration has been simplified as
well. The RX queue is only processed when some data are ready to be
read from TAP. The event related to the RX queue getting more
descriptors only serves the purpose to register the TAP file if it's not
already.
With all these simplifications, the code is more readable but more
performant as well. We can see an improvement of 10% for a single
queue device.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This helper can open a TAP device and configure the interface on it. If
the device needs to be opened multiple times for MQ then it also handles
that correctly.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Even if the vhost-user-net device did implement all currently-defined
features, it would be very short-sighted to use ::all(), because if a
new feature was defined later, the device would start claiming to
implement it even though it didn't.
More practically, claiming to implement all features breaks using QEMU
with the cloud-hypervisor vhost-user-net backend, because QEMU will
negotiate VHOST_USER_PROTOCOL_F_SLAVE_REQ, and then break when the
communication channel isn't actually set up.
I wasn't sure exactly which features the backend should claim to
implement, though. Definitely MQ, and I'm fairly certain none of the
features I've ommitted are implemented. But I'm not sure about
REPLY_ACK. As far as I can tell it should be implemented entirely by
the vhost crate, with no cooperation required from the vhost-user-net
backend itself, so there should be no reason to let a frontend use it
if it wants to. But despite this, neither vhost-user-fs nor
vhost-user-blk claims to implement it.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
EpollHelper allows the removal of much duplicated loop handling code and
instead the device specific even handling is delegated via an
implementation of EpollHelperHandler.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Move NetQueuePair and the related NetCounters into the net_util crate.
This means that the vhost_user_net crate now no longer depends on
virtio-devices and so does not depend on the pci, qcow or other similar
crates. This significantly simplifies the build chain for this backend.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
By moving the code for opening the two RX and TX queues into a shared
location we are starting to remove the requirement for the
vhost-user-net backend to depend on the virtio-devices crate which in of
itself depends on many other crates that are not necessary for the
backend to function.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
By moving the code for opening the TAP device into a shared location we
are starting to remove the requirement for the vhost-user-net backend to
depend on the virtio-devices crate which in of itself depends on many
other crates that are not necessary for the backend to function.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Remove the vmm dependency from vhost_user_block and vhost_user_net where
it was existing to use config::OptionParser. By moving the OptionParser
to its own crate at the top-level we can remove the very heavy
dependency that these vhost-user backends had.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The binary is still built in the same location but the source code and
the dependencies for it come from the vhost_user_net crate itself.
The binary will be built with:
`cargo build --all --bin vhost_user_net` or just `cargo build --all`
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Split the generic virtio code (queues and device type) from the
VirtioDevice trait, transport and device implementations.
This also simplifies the feature handling in vhost_user_backend as the
vm-virtio crate is no longer has any features.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This removes the need to use CAP_NET_ADMIN privileges and instead the
host MAC addres is either provided by the user or alternatively it is
retrieved from the kernel.
TEST=Run cloud-hypervisor without CAP_NET_ADMIN permission and a
preconfigured tap device:
sudo ip tuntap add name tap0 mode tap
sudo ifconfig tap0 192.168.249.1 netmask 255.255.255.0 up
cargo clean
cargo build
target/debug/cloud-hypervisor --serial tty --console off --kernel ~/src/rust-hypervisor-firmware/target/target/release/hypervisor-fw --disk path=~/workloads/clear-33190-kvm.img --net tap=tap0
VM was also rebooted to check that works correctly.
Fixes: #1274
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The general handling of VIRTIO_RING_F_EVENT_IDX is in the
vhost_user_backend functionality and the net specific handling is in the
NetQueuePair from virtio-net.
As such enabling for the vhost-user-net backend is just the case of
adding the feature.
Fixes: #789
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The logic for handling the networking queues can now be shared between
the version running in vhost-user-net and vm-virtio.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
According to the virtio spec the guest should always be interrupted when
"used" descriptors are returned from the device to the driver. However
this was not the case for the TX queue in either the virtio-net
implementation or the vhost-user-net implementation.
This would have meant that the guest could end up with a reduced TX
throughput as it would not know that the packets had been dispatched via
the VMM.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Add a new "host_mac" parameter to "--net" and "--net-backend" and use
this to set the MAC address on the tap interface. If no address is given
one is randomly assigned and is stored in the config.
Support for vhost-user-net self spawning was also included.
Fixes: #1177
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Changes is vhost crate require VhostUserDaemon users to create and
provide a vhost::Listener in advance. This allows us to adopt
sandboxing strategies in the future, by being able to create the UNIX
socket before switching to a restricted namespace.
Update also the reference to vhost crate in Cargo.lock to point to the
latest commit from the dragonball branch.
Signed-off-by: Sergio Lopez <slp@redhat.com>
Switch to using the recently added OptionParser in the code that parses
the network backend.
Whilst doing this also update the net-backend syntax to use "sock"
rather than socket.
Fixes: #1092
Partially fixes: #1091
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Rather than repeat syntax for the vhost-user-net backend in multiple
places store it in one place and reference it from the required places.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
