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| author | Raphael Norwitz | 2019-10-29 22:38:02 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin | 2020-01-05 13:03:03 +0100 |
| commit | d91d57e604edc128be302b60dabba6a34f0e0f0f (patch) | |
| tree | 9f47f687e83e9a1242dc139490e747d49ef308f1 /docs | |
| parent | hw/pci/pci_host: Let pci_data_[read/write] use unsigned 'size' argument (diff) | |
| download | qemu-d91d57e604edc128be302b60dabba6a34f0e0f0f.tar.gz qemu-d91d57e604edc128be302b60dabba6a34f0e0f0f.tar.xz qemu-d91d57e604edc128be302b60dabba6a34f0e0f0f.zip | |
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 <david.vrabel@nutanix.com>
Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Message-Id: <1572385083-5254-2-git-send-email-raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/interop/vhost-user.rst | 15 |
1 files changed, 15 insertions, 0 deletions
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 ------------------- |