From d91d57e604edc128be302b60dabba6a34f0e0f0f Mon Sep 17 00:00:00 2001 From: Raphael Norwitz Date: Tue, 29 Oct 2019 17:38:02 -0400 Subject: vhost-user: add VHOST_USER_RESET_DEVICE to reset devices Add a VHOST_USER_RESET_DEVICE message which will reset the vhost user backend. Disabling all rings, and resetting all internal state, ready for the backend to be reinitialized. A backend has to report it supports this features with the VHOST_USER_PROTOCOL_F_RESET_DEVICE protocol feature bit. If it does so, the new message is used instead of sending a RESET_OWNER which has had inconsistent implementations. Signed-off-by: David Vrabel Signed-off-by: Raphael Norwitz Message-Id: <1572385083-5254-2-git-send-email-raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- docs/interop/vhost-user.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'docs/interop') diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 015ac08177..5f8b3a456b 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -785,6 +785,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD 10 #define VHOST_USER_PROTOCOL_F_HOST_NOTIFIER 11 #define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12 + #define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13 Master message types -------------------- @@ -1190,6 +1191,20 @@ Master message types ancillary data. The GPU protocol is used to inform the master of rendering state and updates. See vhost-user-gpu.rst for details. +``VHOST_USER_RESET_DEVICE`` + :id: 34 + :equivalent ioctl: N/A + :master payload: N/A + :slave payload: N/A + + Ask the vhost user backend to disable all rings and reset all + internal device state to the initial state, ready to be + reinitialized. The backend retains ownership of the device + throughout the reset operation. + + Only valid if the ``VHOST_USER_PROTOCOL_F_RESET_DEVICE`` protocol + feature is set by the backend. + Slave message types ------------------- -- cgit v1.2.3-55-g7522