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vhost: refactor postcopy registration

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This patch moves the registration of postcopy to a
dedicated function, with the goal of simplifying
VHOST_USER_SET_MEM_TABLE request handling function.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
This commit is contained in:
Maxime Coquelin 2021-01-05 13:57:27 +01:00 committed by Ferruh Yigit
parent fc2225dbc5
commit 761ea501ce
1 changed files with 58 additions and 40 deletions
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98
lib/librte_vhost/vhost_user.c
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@ -1041,6 +1041,62 @@ vhost_user_postcopy_region_register(struct virtio_net *dev __rte_unused,
}
#endif
static int
vhost_user_postcopy_register(struct virtio_net *dev, int main_fd,
struct VhostUserMsg *msg)
{
struct VhostUserMemory *memory;
struct rte_vhost_mem_region *reg;
VhostUserMsg ack_msg;
uint32_t i;
if (!dev->postcopy_listening)
return 0;
/*
* We haven't a better way right now than sharing
* DPDK's virtual address with Qemu, so that Qemu can
* retrieve the region offset when handling userfaults.
*/
memory = &msg->payload.memory;
for (i = 0; i < memory->nregions; i++) {
reg = &dev->mem->regions[i];
memory->regions[i].userspace_addr = reg->host_user_addr;
}
/* Send the addresses back to qemu */
msg->fd_num = 0;
send_vhost_reply(main_fd, msg);
/* Wait for qemu to acknolwedge it's got the addresses
* we've got to wait before we're allowed to generate faults.
*/
if (read_vhost_message(main_fd, &ack_msg) <= 0) {
VHOST_LOG_CONFIG(ERR,
"Failed to read qemu ack on postcopy set-mem-table\n");
return -1;
}
if (validate_msg_fds(&ack_msg, 0) != 0)
return -1;
if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
VHOST_LOG_CONFIG(ERR,
"Bad qemu ack on postcopy set-mem-table (%d)\n",
ack_msg.request.master);
return -1;
}
/* Now userfault register and we can use the memory */
for (i = 0; i < memory->nregions; i++) {
reg = &dev->mem->regions[i];
if (vhost_user_postcopy_region_register(dev, reg) < 0)
return -1;
}
return 0;
}
static int
vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
int main_fd)
@ -1215,48 +1271,10 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
mmap_size,
alignment,
mmap_offset);
if (dev->postcopy_listening) {
/*
* We haven't a better way right now than sharing
* DPDK's virtual address with Qemu, so that Qemu can
* retrieve the region offset when handling userfaults.
*/
memory->regions[i].userspace_addr =
reg->host_user_addr;
}
}
if (dev->postcopy_listening) {
/* Send the addresses back to qemu */
msg->fd_num = 0;
send_vhost_reply(main_fd, msg);
/* Wait for qemu to acknolwedge it's got the addresses
* we've got to wait before we're allowed to generate faults.
*/
VhostUserMsg ack_msg;
if (read_vhost_message(main_fd, &ack_msg) <= 0) {
VHOST_LOG_CONFIG(ERR,
"Failed to read qemu ack on postcopy set-mem-table\n");
goto free_mem_table;
}
if (validate_msg_fds(&ack_msg, 0) != 0)
goto free_mem_table;
if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
VHOST_LOG_CONFIG(ERR,
"Bad qemu ack on postcopy set-mem-table (%d)\n",
ack_msg.request.master);
goto free_mem_table;
}
/* Now userfault register and we can use the memory */
for (i = 0; i < memory->nregions; i++)
if (vhost_user_postcopy_region_register(dev,
&dev->mem->regions[i]) < 0)
goto free_mem_table;
}
if (vhost_user_postcopy_register(dev, main_fd, msg) < 0)
goto free_mem_table;
for (i = 0; i < dev->nr_vring; i++) {
struct vhost_virtqueue *vq = dev->virtqueue[i];