Standardize and fix issues in `virtio.c` and `virtio.h` comment headers.
Improvements include:
- Added `()` to function names in comment summaries.
- Added colons after parameter and enum member tags.
- Changed `/*` to `/**` for `virtq_avail_event()` comment.
- Fixed typos (e.g., "file"->"fill", "virqueue"->"virtqueue").
- Added missing `Return:` tag for `vu_queue_rewind()`.
- Corrected parameter names in `virtio.h` comments to match code.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
vhost-user added several functions which are exposed in headers, but not
used outside the file where they're defined. I can't tell if these are
really internal functions, or of they're logically supposed to be exported,
but we don't happen to have anything using them yet.
For the time being, just remove the exports. We can add them back if we
need to.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Introduce facilities for guest migration on top of vhost-user
infrastructure. Add migration facilities based on top of the current
vhost-user infrastructure, moving vu_migrate() and related functions
to migrate.c.
Versioned migration stages define function pointers to be called on
source or target, or data sections that need to be transferred.
The migration header consists of a magic number, a version number for the
encoding, and a "compat_version" which represents the oldest version which
is compatible with the current one. We don't use it yet, but that allows
for the future possibility of backwards compatible protocol extensions.
Co-authored-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Set the file descriptor to use to transfer the
backend device state during migration.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fixed nits and coding style here and there]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
After transferring the back-end’s internal state during migration,
check whether the back-end was able to successfully fully process
the state.
The value returned indicates success or error;
0 is success, any non-zero value is an error.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Sets logging shared memory space.
When the back-end has VHOST_USER_PROTOCOL_F_LOG_SHMFD protocol feature,
the log memory fd is provided in the ancillary data of
VHOST_USER_SET_LOG_BASE message, the size and offset of shared memory
area provided in the message.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix coding style in a bunch of places]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
vu_dev will be needed to log page update.
Add the parameter to:
vring_used_write()
vu_queue_fill_by_index()
vu_queue_fill()
vring_used_idx_set()
vu_queue_flush()
The new parameter is unused for now.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
VHOST_USER_SET_LOG_FD is an optional message with an eventfd
in ancillary data, it may be used to inform the front-end that the
log has been modified.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix comment to vu_set_log_fd_exec()]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
We don't modify the structure in some virtio functions.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Add virtio.c and virtio.h that define the functions needed
to manage virtqueues.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
