During a migration, the vhost-user device talks to the backend to
retrieve the dirty pages. Once done with this, a snapshot will be taken,
meaning there's no need to communicate with the backend anymore. Closing
the communication is needed to let the destination VM being able to
connect to the same backend.
That's why we shutdown the communication with the backend in case a
migration has been started and we're asked for a snapshot.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This anticipates the need for creating a new Blk, Fs or Net object
without having performed the connection with the vhost-user backend yet.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
It was incorrect to call Vec::from_raw_parts() on the address pointing
to the shared memory log region since Vec is a Rust specific structure
that doesn't directly translate into bytes. That's why we use the same
function from std::slice in order to create a proper slice out of the
memory region, which is then copied into a Vec.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Now that the common vhost-user code can handle logging dirty pages
through shared memory, we need to advertise it to the vhost-user
backends with the protocol feature VHOST_USER_PROTOCOL_F_LOG_SHMFD.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Allow vsocks to connect to Unix sockets on the host running
cloud-hypervisor with enabled seccomp.
Reported-by: Philippe Schaaf <philippe.schaaf@secunet.com>
Tested-by: Franz Girlich <franz.girlich@tu-ilmenau.de>
Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
This doesn't really affect the build as we ship a Cargo.lock with fixed
versions in. However for clarity it makes sense to use fixed versions
throughout and let dependabot update them.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Adding the common vhost-user code for starting logging dirty pages when
the migration is started, and its counterpart for stopping, as well as
the code in charge of retrieving the bitmap of the dirty pages that have
been logged.
All these functions are meant to be leveraged from vhost-user devices.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Adding a simple field `migration_support` to VhostUserHandle in order to
store the information about the device supporting migration or not. The
value of this flag depends on the feature set negotiated with the
backend. It's considered as supporting migration if VHOST_F_LOG_ALL is
present in the virtio features and if VHOST_USER_PROTOCOL_F_LOG_SHMFD is
present in the vhost-user protocol features.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
backend like SPDK required to know how many virt queues to be handled
before gets VHOST_USER_SET_INFLIGHT_FD message.
fix dpdk core dump while processing vhost_user_set_inflight_fd:
#0 0x00007fffef47c347 in vhost_user_set_inflight_fd (pdev=0x7fffe2895998, msg=0x7fffe28956f0, main_fd=545) at ../lib/librte_vhost/vhost_user.c:1570
#1 0x00007fffef47e7b9 in vhost_user_msg_handler (vid=0, fd=545) at ../lib/librte_vhost/vhost_user.c:2735
#2 0x00007fffef46bac0 in vhost_user_read_cb (connfd=545, dat=0x7fffdc0008c0, remove=0x7fffe2895a64) at ../lib/librte_vhost/socket.c:309
#3 0x00007fffef45b3f6 in fdset_event_dispatch (arg=0x7fffef6dc2e0 <vhost_user+8192>) at ../lib/librte_vhost/fd_man.c:286
#4 0x00007ffff09926f3 in rte_thread_init (arg=0x15ee180) at ../lib/librte_eal/common/eal_common_thread.c:175
Signed-off-by: Arafatms <arafatms@outlook.com>
This patch adds all the seccomp rules missing for MSHV.
With this patch MSFT internal CI runs with seccomp enabled.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
The vhost-user-net backend needs to prepare all queues before enabling vring.
For example, DPVGW will report 'the RX queue can't find' error, if we enable
vring immediately after kicking it out.
Signed-off-by: Arafatms <arafatms@outlook.com>
Adding the support for snapshot/restore feature for all supported
vhost-user devices.
The complexity of vhost-user-fs device makes it only partially
compatible with the feature. When using the DAX feature, there's no way
to store and remap what was previously mapped in the DAX region. And
when not using the cache region, if the filesystem is mounted, it fails
to be properly restored as this would require a special command to let
the backend know that it must remount what was already mounted before.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This patch moves all vhost-user common functions behind a new structure
VhostUserHandle. There is no functional changes intended, the only goal
being to prepare for storing information through this new structure,
limiting the amount of parameters that are needed for each function.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
With the new beta version, clippy complains about redundant allocation
when using Arc<Box<dyn T>>, and suggests replacing it simply with
Arc<dyn T>.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
There are some seccomp rules needed for MSHV
in virtio-devices but not for KVM. We only want to
add those rules based on MSHV feature guard.
Signed-off-by: Muminul Islam <muislam@microsoft.com>
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>
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>
This dependency bump needed some manual handling since the API changed
quite a lot regarding some RawFd being changed into either File or
AsRawFd traits.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Issue from beta verion of clippy:
Error: --> vm-virtio/src/queue.rs:700:59
|
700 | if let Some(used_event) = self.get_used_event(&mem) {
| ^^^^ help: change this to: `mem`
|
= note: `-D clippy::needless-borrow` implied by `-D warnings`
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
Signed-off-by: Bo Chen <chen.bo@intel.com>
Now that vhost crate allows the caller to set the header flags, we can
set NEED_REPLY whenever the REPLY_ACK protocol feature is supported from
both ends.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
For vhost-user devices, memory should be shared between CLH and
vhost-user backend. However, madvise DONTNEED doesn't working in
this case. So, let's use fallocate PUNCH_HOLE to discard those
memory regions instead.
Signed-off-by: Li Hangjing <lihangjing@bytedance.com>
Sometimes we need balloon deflate automatically to give memory
back to guest, especially for some low priority guest processes
under memory pressure. Enable deflate_on_oom to support this.
Usage: --balloon "size=0,deflate_on_oom=on" \
Signed-off-by: Fei Li <lifei.shirley@bytedance.com>
Since using the VIRTIO configuration to expose the virtual IOMMU
topology has been deprecated, the virtio-iommu implementation must be
updated.
In order to follow the latest patchset that is about to be merged in the
upstream Linux kernel, it must rely on ACPI, and in particular the newly
introduced VIOT table to expose the information about the list of PCI
devices attached to the virtual IOMMU.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.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>
This commit enables socket reconnection for vhost-user-fs backends. Note
that, till this commit:
- The re-establish of the slave communication channel is no supported. So
the socket reconnection does not support virtiofsd with DAX enabled.
- Inflight I/O tracking and restoring is not supported. Therefore, only
virtio-fs daemons that are not processing inflight requests can work
normally after reconnection.
- To make the restarted virtiofsd work normally after reconnection, the
internal status of virtiofsd should also be recovered. This is not the
work of cloud-hypervisor. If the virtio-fs daemon does not support
saving or restoring its internal status, then a re-mount in guest after
socket reconnection should be performed.
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com>
This commit enables socket reconnection for vhost-user-blk backends.
Note that, till this commit, inflight I/O trakcing and restoring is not
supported. Therefore, only vhost-user-blk backend that are not processing
inflight requests can work normally after reconnection.
Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.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>
Function "GuestMemory::with_regions(_mut)" were mainly temporary methods
to access the regions in `GuestMemory` as the lack of iterator-based
access, and hence they are deprecated in the upstream vm-memory crate [1].
[1] https://github.com/rust-vmm/vm-memory/issues/133
Signed-off-by: Bo Chen <chen.bo@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>
Add a helper to VirtioCommon which returns duplicates of the EventFds
for kill and pause event.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
The control queue was missing rt_sigprocmask syscall, which was causing
a crash when the VM was shutdown.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@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>
This commit implements the reconnection feature for vhost-user-net in
case the connection with the backend is shutdown.
The guest has no knowledge about what happens when a disconnection
occurs, which simplifies the code to handle the reconnection. The
reconnection happens with the backend, and the VMM goes through the
vhost-user setup once again.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
We thought we could move the control queue to the backend as it was
making some good sense. Unfortunately, doing so was a wrong design
decision as it broke the compatibility with OVS-DPDK backend.
This is why this commit moves the control queue back to the VMM side,
meaning an additional thread is being run for handling the communication
with the guest.
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>
The VIRTIO features should not be set before they are acked from the
guest. This code was only present to overcome a vhost crate limitation
that was expecting the VIRTIO features to be set before we could fetch
and set the protocol features.
The vhost crate has been recently fixed by removing the limitation,
therefore there's no need for this workaround in the Cloud Hypervisor
codebase anymore.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Everything that was shared in the net_util.rs file has been now moved to
the net_util crate. The only remaining bit was only used by the
virtio-net implementation, that is why this commit moves this code to
virtio-net, and since there's nothing left in net_util.rs, it can be
removed.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since the net_util crate contains the common code needed for processing
the control queue, let's use it and remove the duplicate from inside the
virtio-devices crate.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Moving helpers to the net_util crate since we don't want virtio-net
common code to be split between two places. The net_util crate should be
the only place to host virtio-net common code.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Factorize the virtio features and vhost-user protocol features
negotiation through a common function that blk, fs and net
implementations can directly rely on.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Make sure the virtio features are set upon device activation. At the
time the device is activated, we know the guest acknowledged the
features, which mean it's safe to set them back to the backend.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The virtio features are negotiated and set at the time the device is
created, hence there's no need to set the features again while going
through the vhost-user setup that is performed upon queue activation.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Now that the control queue is correctly handled by the backend, there's
no need to handle it as well from the VMM.
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>
error: all if blocks contain the same code at the start
--> virtio-devices/src/mem.rs:508:9
|
508 | / if plug {
509 | | let handlers =
self.dma_mapping_handlers.lock().unwrap();
|
|_____________________________________________________________________^
|
= note: `-D clippy::branches-sharing-code` implied by `-D warnings`
= help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#branches_sharing_code
help: consider moving the start statements out like this
|
508 | let handlers = self.dma_mapping_handlers.lock().unwrap();
509 | if plug {
|
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
error: usage of `contains_key` followed by `insert` on a `BTreeMap`
--> virtio-devices/src/iommu.rs:439:17
|
439 | / if !mappings.contains_key(&domain) {
440 | | mappings.insert(domain, BTreeMap::new());
441 | | }
| |_________________^ help: try this:
`mappings.entry(domain).or_insert_with(|| BTreeMap::new());`
|
= note: `-D clippy::map-entry` implied by `-D warnings`
= help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Issue from beta version of clippy:
--> virtio-devices/src/vsock/csm/txbuf.rs:69:34
|
69 | Box::new(unsafe {mem::MaybeUninit::<[u8;
Self::SIZE]>::uninit().assume_init()}));
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[deny(clippy::uninit_assumed_init)]` on by default
= help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
Fix backported Firecracker a8c9dffad439557081f3435a7819bf89b87870e7.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
error: reference to packed field is unaligned
--> virtio-devices/src/vhost_user/fs.rs:85:21
|
85 | fs.flags[i].bits() as i32,
| ^^^^^^^^^^^
|
= note: `-D unaligned-references` implied by `-D warnings`
= warning: this was previously accepted by the compiler but is being
phased out; it will become a hard error in a future release!
= note: for more information, see issue #82523
<https://github.com/rust-lang/rust/issues/82523>
= note: fields of packed structs are not properly aligned, and
creating a misaligned reference is undefined behavior (even if that
reference is never dereferenced)
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>
In some situations (booting with OVMF) fewer queues will be enabled
therefore we should iterate over the number of enabled queues (as passed
into VirtioDevice::activate()) rather than the number of create tap
devices.
Fixes: #2578
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This allows the guest to reprogram the offload settings and mitigates
issues where the Linux kernel tries to reprogram the queues even when
the feature is not advertised.
Fixes: #2528
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Rather than erroring out and stalling the queue instead report an error
message if the command is invalid and return an error to the guest via
the status field.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Cleanup the control queue handling in preparation for supporting
alternative commands.
Note that this change does not make the MQ handling spec compliant.
According to the specification MQ should only be enabled once the number
of queue pairs the guest would like to use has been specified. The only
improvement towards the specication in this change is correct error
handling if the guest specifies an inappropriate number of queues (out
of range.)
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Configure the tap offload features to match those that the guest has
acknowledged. The function for converting virtio to tap features came
from crosvm:
4786cee521/devices/src/virtio/net.rs (115)
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In order to support using Versionize for state structures it is necessary
to use simpler, primitive, data types in the state definitions used for
snapshot restore.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Duplicate the fd that is specified in the config so that be used again
after a reboot. When rebooting we destroy all VM state and restore from
the config.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
