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libvhost-user: support host notifier

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This patch introduces the host notifier support in
libvhost-user. A new API is added to support setting
host notifier for each queue.

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tiwei Bie 2018-05-24 18:33:35 +08:00 • committed by Michael S. Tsirkin
parent 44866521bd
commit d84599f56c
2 changed files with 105 additions and 8 deletions
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32
contrib/libvhost-user/libvhost-user.h
View file

@ -51,6 +51,8 @@ enum VhostUserProtocolFeature {
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
VHOST_USER_PROTOCOL_F_CONFIG = 9,
VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10,
VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11,
VHOST_USER_PROTOCOL_F_MAX
};
@ -92,6 +94,14 @@ typedef enum VhostUserRequest {
VHOST_USER_MAX
} VhostUserRequest;
typedef enum VhostUserSlaveRequest {
VHOST_USER_SLAVE_NONE = 0,
VHOST_USER_SLAVE_IOTLB_MSG = 1,
VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
VHOST_USER_SLAVE_MAX
} VhostUserSlaveRequest;
typedef struct VhostUserMemoryRegion {
uint64_t guest_phys_addr;
uint64_t memory_size;
@ -122,6 +132,12 @@ static VhostUserConfig c __attribute__ ((unused));
+ sizeof(c.size) \
+ sizeof(c.flags))
typedef struct VhostUserVringArea {
uint64_t u64;
uint64_t size;
uint64_t offset;
} VhostUserVringArea;
#if defined(_WIN32)
# define VU_PACKED __attribute__((gcc_struct, packed))
#else
@ -133,6 +149,7 @@ typedef struct VhostUserMsg {
#define VHOST_USER_VERSION_MASK (0x3)
#define VHOST_USER_REPLY_MASK (0x1 << 2)
#define VHOST_USER_NEED_REPLY_MASK (0x1 << 3)
uint32_t flags;
uint32_t size; /* the following payload size */
@ -145,6 +162,7 @@ typedef struct VhostUserMsg {
VhostUserMemory memory;
VhostUserLog log;
VhostUserConfig config;
VhostUserVringArea area;
} payload;
int fds[VHOST_MEMORY_MAX_NREGIONS];
@ -368,6 +386,20 @@ VuVirtq *vu_get_queue(VuDev *dev, int qidx);
void vu_set_queue_handler(VuDev *dev, VuVirtq *vq,
vu_queue_handler_cb handler);
/**
* vu_set_queue_host_notifier:
* @dev: a VuDev context
* @vq: a VuVirtq queue
* @fd: a file descriptor
* @size: host page size
* @offset: notifier offset in @fd file
*
* Set queue's host notifier. This function may be called several
* times for the same queue. If called with -1 @fd, the notifier
* is removed.
*/
bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
int size, int offset);
/**
* vu_queue_set_notification: