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>
clippy wants us to use "if let Some(fd) = fd {}" but to combine that
with && is an experimental feature.
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Add to the vhost_rs crate the INFLIGHT_SHMFD protocol feature that was
missing from the list. The feature has been recently introduced in
vhost-user specification, which is the reason why it was missing.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Following the vhost-user specification that can be found at
https://github.com/qemu/qemu/blob/master/docs/interop/vhost-user.rst#virtio-device-config-space
this patch fixes the GET_CONFIG command.
This command is very specific as it needs to provide a body and a
payload corresponding to the content of the configuration structure as
an array of bytes. As a reply, it receives the body and payload provided
by the slave.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This reverts commit 3e99098bf3 because we
realized there was no need for those extra functions to be introduced as
the existing one from the vhost crate are sufficient for the vhost-user
configuration use case.
The previous definitions does not cover config space read/write
and only cover general message as below:
A vhost-user message consists of 3 header fields and a payload.
+---------+-------+------+---------+
| request | flags | size | payload |
+---------+-------+------+---------+
but for config space, the payload include:
Virtio device config space
^^^^^^^^^^^^^^^^^^^^^^^^^^
+--------+------+-------+---------+
| offset | size | flags | payload |
+--------+------+-------+---------+
:offset: a 32-bit offset of virtio device's configuration space
:size: a 32-bit configuration space access size in bytes
🎏 a 32-bit value:
- 0: Vhost master messages used for writeable fields
- 1: Vhost master messages used for live migration
:payload: Size bytes array holding the contents of the virtio
device's configuration space
This patch add specific functions for config message, which can
get/set config space from/to backend.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
There is one definition in message.rs file as below:
pub const VHOST_USER_CONFIG_OFFSET: u32 = 0x100
This definition is only for virtio mmio config space
and we will add this offset in virtio-mmio side and
not vhost user protocl side.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Use acked_protocol_features to replace acked_virtio_features in
get_config()/set_config() for protocol features like CONFIG.
This patch also fix wrong GET_CONFIG setting for set_config().
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
The latest vhost user spec only define two members in
VhostSetConfigType, master and live migration. These
changes can make rust-vmm compatible with vhost user backend.
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
The recvmsg syscall can split a request in multiple packets unless we
use the flag MSG_WAITALL to make sure the request will wait for the
whole data to be transferred before returning.
This flag is needed to prevent the vhost crate from returning the error
PartialMessage, which occured sporadically when using virtio-fs, and
which was detected as part of our continuous integration testing.
Fixes#182
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
No matter if the communication is coming from the master or the slave,
it should always reply with an ack if the message header specifies that
it expects a reply.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
The structure of the vmm-sys-util crate has changed with lots of code
moving to submodules.
This change adjusts the use of the imported structs to reference the
submodules.
Fixes: #145
Signed-off-by: Rob Bradford <robert.bradford@intel.com>
In order to avoid cloud-hypervisor to rely on a pending PR for the empty
crate "vhost", this commit temporarily copies the content of the crate
based on branch jiangliu/v1 18b5081d9199c76eca49da1971c9d1a65e53e5ff.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
