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vhost_user: Add frontend get_shmem_config command

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The frontend can use this command to retrieve
VirtIO Shared Memory Regions configuration from
the backend. The response contains the number of
shared memory regions, their size, and shmid.

This is useful when the frontend is unaware of
specific backend type and configuration,
for example, in the `vhost-user-device` case.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Albert Esteve <aesteve@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260304165223.2166175-5-aesteve@redhat.com>
This commit is contained in:
Albert Esteve
2026-03-04 17:52:20 +01:00
committed by Michael S. Tsirkin
parent 588acb45c2
commit 458f80f661
4 changed files with 16 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/hw/virtio/vhost-backend.h
View File

@@ -162,6 +162,15 @@ typedef int (*vhost_set_device_state_fd_op)(struct vhost_dev *dev,
int *reply_fd,
Error **errp);
typedef int (*vhost_check_device_state_op)(struct vhost_dev *dev, Error **errp);
/*
* Max regions is VIRTIO_MAX_SHMEM_REGIONS, so that is the maximum
* number of memory_sizes that will be accepted.
*/
typedef int (*vhost_get_shmem_config_op)(struct vhost_dev *dev,
int *nregions,
uint64_t *memory_sizes,
Error **errp);
typedef struct VhostOps {
VhostBackendType backend_type;
@@ -220,6 +229,7 @@ typedef struct VhostOps {
vhost_supports_device_state_op vhost_supports_device_state;
vhost_set_device_state_fd_op vhost_set_device_state_fd;
vhost_check_device_state_op vhost_check_device_state;
vhost_get_shmem_config_op vhost_get_shmem_config;
} VhostOps;
int vhost_user_gpu_set_socket(struct vhost_dev *dev, int fd);

1
include/hw/virtio/vhost-user.h
View File

@@ -35,6 +35,7 @@ enum VhostUserProtocolFeature {
VHOST_USER_PROTOCOL_F_DEVICE_STATE = 19,
VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT = 20,
VHOST_USER_PROTOCOL_F_GPA_ADDRESSES = 21,
VHOST_USER_PROTOCOL_F_SHMEM = 22,
VHOST_USER_PROTOCOL_F_MAX
};

2
include/hw/virtio/virtio.h
View File

@@ -82,6 +82,8 @@ typedef struct VirtQueueElement
#define VIRTIO_NO_VECTOR 0xffff
#define VIRTIO_MAX_SHMEM_REGIONS 256
/* special index value used internally for config irqs */
#define VIRTIO_CONFIG_IRQ_IDX -1

4
subprojects/libvhost-user/libvhost-user.h
View File

@@ -70,7 +70,9 @@ enum VhostUserProtocolFeature {
/* Feature 17 reserved for VHOST_USER_PROTOCOL_F_XEN_MMAP. */
VHOST_USER_PROTOCOL_F_SHARED_OBJECT = 18,
/* Feature 19 is reserved for VHOST_USER_PROTOCOL_F_DEVICE_STATE */
VHOST_USER_PROTOCOL_F_SHMEM = 20,
/* Feature 20 is reserved for VHOST_USER_PROTOCOL_F_GET_VRING_BASE_INFLIGHT */
/* Feature 21 is reserved for VHOST_USER_PROTOCOL_F_GPA_ADDRESSES */
VHOST_USER_PROTOCOL_F_SHMEM = 22,
VHOST_USER_PROTOCOL_F_MAX
};