The cloud hypervisor tells the VM and the backend to support the PACKED_RING feature,
but it actually processes various variables according to the split ring logic, such
as last_avail_index. Eventually it will cause the following error (SPDK as an example):
vhost.c: 516:vhost_vq_packed_ring_enqueue: *ERROR*: descriptor has been used before
vhost_blk.c: 596:process_blk_task: *ERROR*: ====== Task 0x200113784640 req_idx 0 failed ======
vhost.c: 629:vhost_vring_desc_payload_to_iov: *ERROR*: gpa_to_vva((nil)) == NULL
Signed-off-by: Arafatms <arafatms@outlook.com>
Since the reconnection thread took on the responsibility to handle
backend initiated requests as well, the variable naming should reflect
this by avoiding the "reconnect" prefix.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Vhost user INFLIGHT_SHMFD protocol feature supports inflight I/O
tracking, this commit implement the vhost-user device (master) support
of the feature. Till this commit, specific vhost-user devices (blk, fs,
or net) have not enable this feature.
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com>
Add the support for reconnecting the backend request handler after a
disconnection/crash happened.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since the slave request handler is common to all vhost-user devices, the
same way the reconnection is, it makes sense to handle the requests from
the backend through the same thread.
The reconnection thread now handles both a reconnection as well as any
request coming from the backend.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We should try to read the last avail index from the vring memory aera. This
is necessary when handling vhost-user socket reconnection.
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.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>
When in client mode, the VMM will retry connecting the backend for a
minute before giving up.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The reconnection code is moved to the vhost-user module as it is a
common place to be shared across all vhost-user devices.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
A lot of the VIRTIO reserved features should be supported or not by the
vhost-user backend. That means on the VMM side, these features should be
available, so that they don't get lost during the negotiation.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Some refactoring is performed in order to always expect the irqfd to be
provided by VirtioInterrupt trait. In case no irqfd is available, we
simply fail initializing the vhost-user device. This allows for further
simplification since we can assume the interrupt will always be
triggered directly by the vhost-user backend without proxying through
the VMM. This allows for complete removal of the dedicated thread for
both block and net.
vhost-user-fs is a bit more complex as it requires the slave request
protocol feature in order to support DAX. That's why we still need the
VMM to interfere and therefore run a dedicated thread for it.
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>
Adding the support for an OVS vhost-user backend to connect as the
vhost-user client. This means we introduce with this patch a new
option to our `--net` parameter. This option is called 'server' in order
to ask the VMM to run as the server for the vhost-user socket.
Fixes#1745
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Assuming vhost-user devices support CONFIGURE_MEM_SLOTS protocol
feature, we introduce a new method to the VirtioDevice trait in order to
update one single memory at a time.
In case CONFIGURE_MEM_SLOTS is not supported by the backend (feature not
acked), we fallback onto the current way of updating the memory
mappings, that is with SET_MEM_TABLE.
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>
Migrate all vhost-user devices to EpollHelper so as to remove code that
is duplicated between multiple virtio devices.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@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>
