diff options
Diffstat (limited to 'docs/interop')
| -rw-r--r-- | docs/interop/vhost-user.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 4dbc84f..f9e721b 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -308,6 +308,7 @@ replies. Here is a list of the ones that do: There are several messages that the master sends with file descriptors passed in the ancillary data: +* ``VHOST_USER_ADD_MEM_REG`` * ``VHOST_USER_SET_MEM_TABLE`` * ``VHOST_USER_SET_LOG_BASE`` (if ``VHOST_USER_PROTOCOL_F_LOG_SHMFD``) * ``VHOST_USER_SET_LOG_FD`` @@ -1334,6 +1335,14 @@ Master message types ``VHOST_USER_REM_MEM_REG`` message, this message is used to set and update the memory tables of the slave device. + Exactly one file descriptor from which the memory is mapped is + passed in the ancillary data. + + In postcopy mode (see ``VHOST_USER_POSTCOPY_LISTEN``), the slave + replies with the bases of the memory mapped region to the master. + For further details on postcopy, see ``VHOST_USER_SET_MEM_TABLE``. + They apply to ``VHOST_USER_ADD_MEM_REG`` accordingly. + ``VHOST_USER_REM_MEM_REG`` :id: 38 :equivalent ioctl: N/A @@ -1349,6 +1358,14 @@ Master message types ``VHOST_USER_ADD_MEM_REG`` message, this message is used to set and update the memory tables of the slave device. + The memory region to be removed is identified by its guest address, + user address and size. The mmap offset is ignored. + + No file descriptors SHOULD be passed in the ancillary data. For + compatibility with existing incorrect implementations, the slave MAY + accept messages with one file descriptor. If a file descriptor is + passed, the slave MUST close it without using it otherwise. + ``VHOST_USER_SET_STATUS`` :id: 39 :equivalent ioctl: VHOST_VDPA_SET_STATUS |