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vhost-user: modify SET_LOG_BASE to pass mmap size and offset

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Unlike the kernel, vhost-user application accesses log table by
mmaping it to its user space. This change adds two new fields to
VhostUserMsg payload: mmap_size, and mmap_offset and make QEMU to
pass the to vhost-user application in VHOST_USER_SET_LOG_BASE
request.

Signed-off-by: Victor Kaplansky <victork@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Victor Kaplansky 2015-11-11 16:26:02 +02:00 committed by Michael S. Tsirkin
parent 393f04d3ab
commit 2b8819c6ee
3 changed files with 24 additions and 3 deletions
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8
docs/specs/vhost-user.txt
View file

@ -98,6 +98,7 @@ typedef struct VhostUserMsg {
struct vhost_vring_state state;
struct vhost_vring_addr addr;
VhostUserMemory memory;
VhostUserLog log;
};
} QEMU_PACKED VhostUserMsg;
@ -282,7 +283,12 @@ Message types
Master payload: u64
Slave payload: N/A
Sets the logging base address.
Sets logging shared memory space.
When slave has VHOST_USER_PROTOCOL_F_LOG_SHMFD protocol
feature, the log memory fd is provided in the ancillary data of
VHOST_USER_SET_LOG_BASE message, the size and offset of shared
memory area provided in the message.
* VHOST_USER_SET_LOG_FD

11
hw/virtio/vhost-user.c
View file

@ -75,6 +75,11 @@ typedef struct VhostUserMemory {
VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
} VhostUserMemory;
typedef struct VhostUserLog {
uint64_t mmap_size;
uint64_t mmap_offset;
} VhostUserLog;
typedef struct VhostUserMsg {
VhostUserRequest request;
@ -89,6 +94,7 @@ typedef struct VhostUserMsg {
struct vhost_vring_state state;
struct vhost_vring_addr addr;
VhostUserMemory memory;
VhostUserLog log;
} payload;
} QEMU_PACKED VhostUserMsg;
@ -200,8 +206,9 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base,
VhostUserMsg msg = {
.request = VHOST_USER_SET_LOG_BASE,
.flags = VHOST_USER_VERSION,
.payload.u64 = base,
.size = sizeof(msg.payload.u64),
.payload.log.mmap_size = log->size,
.payload.log.mmap_offset = 0,
.size = sizeof(msg.payload.log),
};
if (shmfd && log->fd != -1) {

8
tests/vhost-user-test.c
View file

@ -86,6 +86,11 @@ typedef struct VhostUserMemory {
VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
} VhostUserMemory;
typedef struct VhostUserLog {
uint64_t mmap_size;
uint64_t mmap_offset;
} VhostUserLog;
typedef struct VhostUserMsg {
VhostUserRequest request;
@ -94,10 +99,13 @@ typedef struct VhostUserMsg {
uint32_t flags;
uint32_t size; /* the following payload size */
union {
#define VHOST_USER_VRING_IDX_MASK (0xff)
#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
uint64_t u64;
struct vhost_vring_state state;
struct vhost_vring_addr addr;
VhostUserMemory memory;
VhostUserLog log;
} payload;
} QEMU_PACKED VhostUserMsg;