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| author | Raphael Norwitz | 2020-05-21 07:00:32 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2020-06-12 16:17:06 +0200 |
| commit | 6b0eff1a4ea47c835a7d8bee88c05c47ada37495 (patch) | |
| tree | 17ed939bd48af59b703e44c71d894ec30b6f55a5 /docs | |
| parent | Add vhost-user helper to get MemoryRegion data (diff) | |
| download | qemu-6b0eff1a4ea47c835a7d8bee88c05c47ada37495.tar.gz qemu-6b0eff1a4ea47c835a7d8bee88c05c47ada37495.tar.xz qemu-6b0eff1a4ea47c835a7d8bee88c05c47ada37495.zip | |
Add VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS
This change introduces a new feature to the vhost-user protocol allowing
a backend device to specify the maximum number of ram slots it supports.
At this point, the value returned by the backend will be capped at the
maximum number of ram slots which can be supported by vhost-user, which
is currently set to 8 because of underlying protocol limitations.
The returned value will be stored inside the VhostUserState struct so
that on device reconnect we can verify that the ram slot limitation
has not decreased since the last time the device connected.
Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com>
Message-Id: <1588533678-23450-4-git-send-email-raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Diffstat (limited to 'docs')
| -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 3b1b6602c7..b3cf5c3cb5 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -815,6 +815,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12 #define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13 #define VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS 14 + #define VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS 15 Master message types -------------------- @@ -1263,6 +1264,21 @@ Master message types The state.num field is currently reserved and must be set to 0. +``VHOST_USER_GET_MAX_MEM_SLOTS`` + :id: 36 + :equivalent ioctl: N/A + :slave payload: u64 + + When the ``VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS`` protocol + feature has been successfully negotiated, this message is submitted + by master to the slave. The slave should return the message with a + u64 payload containing the maximum number of memory slots for + QEMU to expose to the guest. At this point, the value returned + by the backend will be capped at the maximum number of ram slots + which can be supported by vhost-user. Currently that limit is set + at VHOST_USER_MAX_RAM_SLOTS = 8 because of underlying protocol + limitations. + Slave message types ------------------- |