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| -rw-r--r-- | docs/interop/vhost-user.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 3c12607517..a99ba4433c 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -1376,6 +1376,14 @@ Front-end message types For further details on postcopy, see ``VHOST_USER_SET_MEM_TABLE``. They apply to ``VHOST_USER_ADD_MEM_REG`` accordingly. + 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 back-end + replies with the bases of the memory mapped region to the front-end. + 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 @@ -1400,6 +1408,14 @@ Front-end message types accept messages with one file descriptor. If a file descriptor is passed, the back-end MUST close it without using it otherwise. + 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 back-end MAY + accept messages with one file descriptor. If a file descriptor is + passed, the back-end MUST close it without using it otherwise. + ``VHOST_USER_SET_STATUS`` :id: 39 :equivalent ioctl: VHOST_VDPA_SET_STATUS |