This change is important to do a proper resource cleanup. We decided
to do this repetitive approach as VirtioCommon can't implement Drop
without major changes to the corresponding code. Also, devices such as
Net can't easily use the epoll_threads-abstraction from VirtioCommon as
it has multiple threads with different semantics.
Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
The information about the identifier related to a Snapshot is only
relevant from the BTreeMap perspective, which is why we can get rid of
the duplicated identifier in every Snapshot structure.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Following the new restore design, it is not appropriate to set every
virtio device threads into a paused state after they've been started.
This is why we remove the line of code pausing the devices only after
they've been restored, and replace it with a small patch in every virtio
device implementation. When a virtio device is created as part of a
restored VM, the associated "paused" boolean is set to true. This
ensures the corresponding thread will be directly parked when being
started, avoiding the thread to be in a different state than the one it
was on the source VM during the snapshot.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Following the new design proposal to improve the restore codepath when
migrating a VM, all virtio devices are supplied with an optional state
they can use to restore from. The restore() implementation every device
was providing has been removed in order to prevent from going through
the restoration twice.
Here is the list of devices now following the new restore design:
- Block (virtio-block)
- Net (virtio-net)
- Rng (virtio-rng)
- Fs (vhost-user-fs)
- Blk (vhost-user-block)
- Net (vhost-user-net)
- Pmem (virtio-pmem)
- Vsock (virtio-vsock)
- Mem (virtio-mem)
- Balloon (virtio-balloon)
- Watchdog (virtio-watchdog)
- Vdpa (vDPA)
- Console (virtio-console)
- Iommu (virtio-iommu)
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The RNG device never reads from the guest memory it reads from a file
and writes to the guest memory.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
With the virtio-rng device the descriptors that are provided by the
guest must be writable and of non-zero length. Also propagate an error
if writing to the guest memory fails.
Signed-off-by: Bo Chen <chen.bo@intel.com>
This function is for really for the transport layer to trigger a device
reset. Instead name it appropriately for the fuzzing specific use case.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Reads from the random file may only be partial, e.g., if the random file is an ordinary text
file. When that happens, the device needs to signal to the driver that only parts of the buffer have
been overwritten.
Signed-off-by: Markus Napierkowski <markus.napierkowski@cyberus-technology.de>
Now that we rely on pop_descriptor_chain() rather than iter() to iterate
over a queue, there's no more borrow on the queue itself, meaning we can
invoke add_used() directly for the iteration loop. This simplifies the
processing of the queues for each virtio device, and bring some possible
performance improvement given we don't have to iterate twice over the
list of descriptors to invoke add_used().
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Using pop_descriptor_chain() is much more appropriate than iter() since
it recreates the iterator every time, avoiding the queue to be borrowed
and allowing the virtio-net implementation to match all the other ones.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
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>
Instead of passing separately a list of Queues and the equivalent list
of EventFds, we consolidate these two through a tuple along with the
queue index.
The queue index can be very useful if looking for the actual index
related to the queue, no matter if other queues have been enabled or
not.
It's also convenient to have the EventFd associated with the Queue so
that we don't have to carry two lists with the same amount of items.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Renaming translate() to translate_gva() to clarify we want to translate
a GVA address into a GPA.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This new trait simplifies the address translation of a GuestAddress by
having GuestAddress implementing it.
The three crates virtio-devices, block_util and net_util have been
updated accordingly to rely on this new trait, helping with code
readability and limiting the amount of duplicated code.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Moving the whole codebase to rely on the AccessPlatform definition from
vm-virtio so that we can fully remove it from virtio-queue crate.
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>
Instead of relying on the virtio-queue crate to store the information
about the MSI-X vectors for each queue, we handle this directly from the
PCI transport layer.
This is the first step in getting closer to the upstream version of
virtio-queue so that we can eventually move fully to the upstream
version.
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>
Introduce a common solution for spawning the virtio threads which will
make it easier to add the panic handling.
During this effort I discovered that there were no seccomp filters
registered for the vhost-user-net thread nor the vhost-user-block
thread. This change also incorporates basic seccomp filters for those as
part of the refactoring.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
We are relying on applying empty 'seccomp' filters to support the
'--seccomp false' option, which will be treated as an error with the
updated 'seccompiler' crate. This patch fixes this issue by explicitly
checking whether the 'seccomp' filter is empty before applying the
filter.
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>
Simplify snapshot & restore code by using generics to specify helper
functions that take / make a Serialize / Deserialize struct
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
error: name `TYPE_UNKNOWN` contains a capitalized acronym
--> vm-virtio/src/lib.rs:48:5
|
48 | TYPE_UNKNOWN = 0xFF,
| ^^^^^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Type_Unknown`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
If the function can never return an error this is now a clippy failure:
error: this function's return value is unnecessarily wrapped by `Result`
--> virtio-devices/src/watchdog.rs:215:5
|
215 | / fn set_state(&mut self, state: &WatchdogState) -> io::Result<()> {
216 | | self.common.avail_features = state.avail_features;
217 | | self.common.acked_features = state.acked_features;
218 | | // When restoring enable the watchdog if it was previously enabled. We reset the timer
... |
223 | | Ok(())
224 | | }
| |_____^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_wraps
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Even though the driver can provide fewer queues than those advertised
for some device types their is a minimum number that is required for
operation.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Rather than having to give and return the ioeventfd used for a device
clone them each time. This will make it simpler when we start handling
the driver enabling fewer queues than advertised by the device.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In order to make the thread naming more useful derive their name from
the device id (which can be supplied by the user) and a device specific
suffix that has details of the individual queue (or queue pair.)
e.g.
rob@artemis:~$ pstree -p -c -l -t `pidof cloud-hypervisor`
cloud-hyperviso(27501)─┬─{_console}(27525)
├─{_disk0_q0}(27529)
├─{_disk0_q1}(27532)
├─{_net1_ctrl}(27533)
├─{_net1_qp0}(27534)
├─{_net1_qp1}(27535)
├─{_rng}(27526)
├─{http-server}(27504)
├─{seccomp_signal_}(27502)
├─{signal_handler}(27523)
├─{vcpu0}(27520)
├─{vcpu1}(27522)
└─{vmm}(27503)
Fixes: #2077
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In order to simplify the transition to VirtioCommon and to avoid needing
to set empty fields derive Default for VirtioCommon.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
There will be some cases where the implementation of the snapshot()
function from the Snapshottable trait will require to modify some
internal data, therefore we make this possible by updating the trait
definition with snapshot(&mut self).
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Using the Rust Barrier mechanism, this patch forces each virtio device
to acknowledge they've been correctly paused before going further.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Instead of passing only the event type through the handle_event()
callback, we make the trait slightly more generic by providing the
epoll event to each virtio device implementation.
This is particularly useful for vsock as it will need the event set.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Currently any messages generated during the worker thread are not
shown anywhere as the thread is never join()ed on. Instead output the
error immediately.
For now only cover the subset where the work to port to EpollHandler
clashed with the seccomp filtering for virtio devices.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Migrate to EpollHelper so as to remove code that is duplicated between
multiple virtio devices.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Remove the write_config() implementations that only generate a warning
as that is now done at the VirtioDevice level.
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>
