For vhost-user devices, we don't want to loose the vhost-user protocol
feature through the negotiation between guest and device. Since we know
VIRTIO has no knowledge of the vhost-user protocol feature, there is no
way it would ever be acknowledged by the guest. For that reason, we
create each vhost-user device with the set of acked features containing
the vhost-user protocol feature is this one was part of the available
list.
Having the set of acked features containing this bit allows for solving
a bug that was happening through the migration process since the
vhost-user protocol feature wasn't explicitely enabled.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Implement the VIRTIO_BALLOON_F_REPORTING feature, indicating to the
guest it can report set of free pages. A new virtqueue dedicated for
receiving the information about the free pages is created. The VMM
releases the memory by punching holes with fallocate() if the guest
memory is backed by a file, and madvise() the host about the ranges of
memory that shouldn't be needed anymore.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Adding a new parameter free_page_reporting=on|off to the balloon device
so that we can enable the corresponding feature from virtio-balloon.
Running a VM with a balloon device where this feature is enabled allows
the guest to report pages that are free from guest's perspective. This
information is used by the VMM to release the corresponding pages on the
host.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Improving the existing code for better readability and in anticipation
for adding an additional virtqueue for the free page reporting feature.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This should not occur as ioeventfd is used for notification. Such an
error message would have made the discovery of the underlying cause of
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In order to clearly decouple when the migration is started compared to
when the dirty logging is started, we introduce a new method to the
Migratable trait. This clarifies the semantics as we don't end up using
start_dirty_log() for identifying when the migration has been started.
And similarly, we rely on the already existing complete_migration()
method to know when the migration has been ended.
A bug was reported when running a local migration with a vhost-user-net
device in server mode. The reason was because the migration_started
variable was never set to "true", since the start_dirty_log() function
was never invoked.
Signed-off-by: lizhaoxin1 <Lxiaoyouling@163.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Now that all the preliminary work has been merged to make Cloud
Hypervisor work with the upstream crate virtio-queue from
rust-vmm/vm-virtio repository, we can move the whole codebase and remove
the local copy of the virtio-queue crate.
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>
Moving away from the virtio-queue mechanism for descriptor address
translation. Instead, we enable the new mechanism added to every
VirtioDevice implementation, by setting the AccessPlatform trait if one
can be found.
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>
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>
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>
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>
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>
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>
Add a new method set_access_platform() to the VirtioDevice trait in
order to allow an AccessPlatform trait to be setup on any virtio device.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Upon the enablement of the queue by the guest, we perform a translation
of the descriptor table, the available ring and used ring addresses
prior to enabling the device itself. This only applies to the case where
the device is placed behind a vIOMMU, which is the reason why the
translation is needed. Indeed, the addresses allocated by the guest are
IOVAs which must be translated into GPAs before we can access the queue.
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>
When freeing memory sometimes glibc will attempt to read
"/proc/sys/vm/overcommit_memory" to find out how it should release the
blocks. This happens sporadically with Cloud Hypervisor but has been
seen in use. It is not necessary to add the read() syscall to the list
as it is already included in the virtio devices common set. Similarly
the vCPU and vmm threads already have both these in the allowed list.
Fixes: #3609
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Whenever the backing file of our virtio-block device is opened with
O_DIRECT, there's a requirement about the buffer address and size to be
aligned to the sector size.
We know virtio-block requests are sector aligned in terms of size, but
we must still check if the buffer address is. In case it's not, we
create an intermediate buffer that will be passed through the system
call. In case of a write operation, the content of the non-aligned
buffer must be copied beforehand, and in case of a read operation, the
content of the aligned buffer must be copied to the non-aligned one
after the operation has been completed.
Fixes#3587
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This crate contains up to date definition of the Queue, AvailIter,
DescriptorChain and Descriptor structures forked from the upstream
crate rust-vmm/vm-virtio 27b18af01ee2d9564626e084a758a2b496d2c618.
The following patches have been applied on top of this base in order to
make it work correctly with Cloud Hypervisor requirements:
- Add MSI vector field to the Queue
In order to help with MSI/MSI-X support, it is convenient to store the
value of the interrupt vector inside the Queue directly.
- Handle address translations
For devices with access to data in memory being translated, we add to
the Queue the ability to translate the address stored in the
descriptor.
It is very helpful as it performs the translation right after the
untranslated address is read from memory, avoiding any errors from
happening from the consumer's crate perspective. It also allows the
consumer to reduce greatly the amount of duplicated code for applying
the translation in many different places.
- Add helpers for Queue structure
They are meant to help crate's consumers getting/setting information
about the Queue.
These patches can be found on the 'ch' branch from the Cloud Hypervisor
fork: https://github.com/cloud-hypervisor/vm-virtio.git
This patch takes care of updating the Cloud Hypervisor code in
virtio-devices and vm-virtio to build correctly with the latest version
of virtio-queue.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
When forwarding an epoll event from the unix muxer to the
targeted connection event handler, the eventset the connection
registered is forwarded instead of the actual epoll
operation (IN/OUT).
For example, if the connection was registered for EPOLLIN,
and receives an EPOLLOUT, the connection will actually handle
an EPOLLOUT.
This is the root cause of previous bug, which caused the
introduction of some workarounds (i.e: handling ewouldblock
when reading after receiving EPOLLIN, which should never happen).
When matching the connection, we retrieve and use the evset of
the connection instead of the one passed as a parameter.
The compiler does not complain for an unused variable because
it was first logged in a debug! statement.
This is an unfortunate naming mistake that caused a lot of problems.
Fixes#3497
Signed-off-by: Eduard Kyvenko <eduard.kyvenko@gmail.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
If the disk is backed by a block device on the host a non-default
topology will be available and that topology can be advertised by virtio
block.
Fixes: #3262
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This reverts commit 58d25b3ccc.
This change introduced a regression when running iperf with the guest
running as the server:
marvin:~/src/cloud-hypervisor ((58d25b3c...))$ iperf -c 192.168.249.2
------------------------------------------------------------
Client connecting to 192.168.249.2, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 1] local 192.168.249.1 port 47078 connected with 192.168.249.2 port 5001
[ ID] Interval Transfer Bandwidth
[ 1] 0.00-10.40 sec 14.0 MBytes 11.3 Mbits/sec
marvin:~/src/cloud-hypervisor ((58d25b3c...))$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
[ 1] local 192.168.249.1 port 5001 connected with 192.168.249.2 port 42866
[ ID] Interval Transfer Bandwidth
[ 1] 0.00-10.01 sec 51.2 GBytes 44.0 Gbits/sec
Fixes: #3450
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
By merging receive buffers through the VIRTIO_NET_F_MRG_RXBUF feature,
as well as enabling the use of indirect descriptors through
VIRTIO_RING_F_INDIRECT_DESC feature, we achieve better throughput for
the virtio-net device without hurting its latency.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Since each segment must have a non-overlapping memory range associated
with it the device memory must be equally divided amongst all segments.
A new allocator is used for each segment to ensure that BARs are
allocated from the correct address ranges. This requires changes to
PciDevice::allocate/free_bars to take that allocator and when
reallocating BARs the correct allocator must be identified from the
ranges.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Move the decision on whether to use a 64-bit bar up to the DeviceManager
so that it can use both the device type (e.g. block) and the PCI segment
ID to decide what size bar should be used.
Signed-off-by: Rob Bradford <robert.bradford@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 structs are not read on the VMM side but are used in communication
with the guest.
As identified by the new beta clippy.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Setting the reply_ack should depend on the set of acknowledged features
containing the REPLY_ACK flag.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
In order to support correctly the snapshot/restore and migration use
cases, we must be careful with the ranges that we discard by punching
holes. On restore, there might be some ranges already plugged in,
meaning they should not be discarded. That's why we loop over the list
of blocks to discard only the ranges that are marked as unplugged.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
By creating the BlocksState object in the MemoryManager, we can directly
provide it to the virtio-mem device when being created. This will allow
the MemoryManager through each VirtioMemZone to have a handle onto the
blocks that are plugged at any point in time.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This is going to be useful to let virtio-mem report the list of ranges
that are currently plugged, so that both snapshot/restore and migration
will copy only what is needed.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This will be helpful to support the creation of a MemoryRangeTable from
virtio-mem, as it uses 2M pages.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Adding the snapshot/restore support along with migration as well,
allowing a VM with virtio-mem devices attached to be properly
migrated.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Implement the infrastructure that lets a virtio-mem device map the guest
memory into the device. This is necessary since with virtio-mem zones
memory can be added or removed and the vfio-user device must be
informed.
Fixes: #3025
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
For vfio-user the mapping handler is per device and needs to be removed
when the device in unplugged.
For VFIO the mapping handler is for the default VFIO container (used
when no vIOMMU is used - using a vIOMMU does not require mappings with
virtio-mem)
To represent these two use cases use an enum for the handlers that are
stored.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Adding the snapshot/restore support along with migration as well,
allowing a VM with a virtio-balloon device attached to be properly
migrated.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The MSI IOVA address on X86 and AArch64 is different.
This commit refactored the code to receive the MSI IOVA address and size
from device_manager, which provides the actual IOVA space data for both
architectures.
Signed-off-by: Michael Zhao <michael.zhao@arm.com>
For most use cases, there is no need to create multiple VFIO containers
as it causes unwanted behaviors. Especially when passing multiple
devices from the same IOMMU group, we need to use the same container so
that it can properly list the groups that have been already opened. The
correct logic was already there in vfio-ioctls, but it was incorrectly
used from our VMM implementation.
For the special case where we put a VFIO device behind a vIOMMU, we must
create one container per device, as we need to control the DMA mappings
per device, which is performed at the container level. Because we must
keep one container per device, the vIOMMU use case prevents multiple
devices attached to the same IOMMU group to be passed through the VM.
But this is a limitation that we are fine with, especially since the
vIOMMU doesn't let us group multiple devices in the same group from a
guest perspective.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
