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vhost-vdpa: introduce SUSPEND backend feature bit

Userland knows if it can suspend the device or not by checking this feature bit. It's only offered if the vdpa driver backend implements the suspend() operation callback, and to offer it or userland to ack it if the backend does not offer that callback is an error.

Eugenio Pérez committed 4 years ago

Commit 0723f1d1 parent 848ecea2 files · +17 −1Browse files

Showing the changes to include/uapi (1 of 2 files). Show all

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include/uapi/linux/vhost_types.h+2−0
@@ -161,5 +161,7 @@ struct vhost_vdpa_iova_range { · 160 unmodified lines
161161 * message
162162 */
163163 #define VHOST_BACKEND_F_IOTLB_ASID 0x3
164+/* Device can be suspended */
165+#define VHOST_BACKEND_F_SUSPEND 0x4
164166
165167 #endif