The way in which offsets are currently use in memory regions is
derived from QEMU's contrib/libvhost-user, but while this one works
mainly by translating vmm va's to local va's, vm-memory expects us to
use proper guest addresses and thus, define memory regions that
actually match the guest's memory disposition.
With this change, we create the memory regions with the proper length
and offsets, extend AddrMapping to store the guest physical address,
and use the latter instead of offset in vmm_va_to_gpa().
Signed-off-by: Sergio Lopez <slp@redhat.com>
set_features() fails with InvalidOperation if !self.owned. I don't see
this as a requirement in the specification and, in fact, vm-virtio
implementation for resetting the device calls SET_FEATURES just after
RESET_OWNER.
Signed-off-by: Sergio Lopez <slp@redhat.com>
Extend VhostUserBackend trait with protocol_features(), so device
backend implementations can freely define which protocol features they
want to support.
Signed-off-by: Sergio Lopez <slp@redhat.com>
The VhostUserConfig carries a message with a payload, the contents of
which depend on the kind of device being emulated.
With this change, we calculate the offset of the payload within the
message, check its size corresponds to the expected one, and pass it
to the backend as a reference to a slice adjusted to the payload
dimensions.
The backend will be responsible of validating the payload, as it's the
one aware of its expected contents.
Signed-off-by: Sergio Lopez <slp@redhat.com>
This commit fixes all the remaining issues that were found as part of
the integration with vhost-user-net.
It fixes the way to notify that a vring is used, by using the proper
EventFd.
It removes the process_queue() function from the trait, since the
complexity it was introducing was leading to deadlocks with mutexes.
It moves the register/unregister functions for registering custom events
from the backend, from the VringEpollHandler to the VringWorker. This
allows for a lot of simplification and solve a deadlock issue.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The original logic does not has any problem without offset, since the
current offset is zero. However, if offset is not zero, while convert
vmm address to backend process address, it needs to consider the
offset.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
The error handling here to trigger break epoll seems not correct,
epoll will be ended once one event is handled, no matter successfully
or failed. Fix it.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
The vhost-user protocol does not indicate set_features could not
be issued more than once, the checking is not needed at all, and
prevent communication between master and slave. Remove it to
fix the issue.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
This patch modifies the library so that a consumer can update the
backend after it's been passed to the daemon.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
By letting the consumer of this crate getting access to the vring
handler, we will be able to let it perform several actions without
producing a deadlock.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We cannot expect every backend to support GET_CONFIG and SET_CONFIG
commands. That's why this patch adds some default implementations for
the trait VhostUserBackend regarding both get_config() and set_config()
functions.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The code needs to initialize a listener to accept connection from the
VMM being the client in this case.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Every time an event is triggered, it needs to be read, but only based on
the status of the vring (enabled or not) will decide if the queue needs
to be processed.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The Queue structure already contains a field "ready" that can be used to
track the status of the vrings.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Let's be realistic, the trait VhostUserBackend will need to have mutable
self for some functions like handle_event, process_queue and set_config,
which is the reason why this commit needs to introduce a RwLock on the
backend instance that was passed around as a simple Arc.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Instead of locking every queues whenever something needs to be updated,
this patch modifies the code design to lock each Vring independently.
This allows for much finer granularity, and will allow multiple queues
to be handled at the same time.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The purpose of this new crate is to provide a common library to all
vhost-user backend implementations. The more is handled by this library,
the less duplication will need to happen in each vhost-user daemon.
This crate relies a lot on vhost_rs, vm-memory and vm-virtio crates.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
