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migration/rdma: destination: create the return patch after the first accept

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destination side:
$ build/qemu-system-x86_64 -enable-kvm -netdev tap,id=hn0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown -device e1000,netdev=hn0,mac=50:52:54:00:11:22 -boot c -drive if=none,file=./Fedora-rdma-server-migration.qcow2,id=drive-virtio-disk0 -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -m 2048 -smp 2 -device piix3-usb-uhci -device usb-tablet -monitor stdio -vga qxl -spice streaming-video=filter,port=5902,disable-ticketing -incoming rdma:192.168.1.10:8888
(qemu) migrate_set_capability postcopy-ram on
(qemu)
dest_init RDMA Device opened: kernel name rocep1s0f0 uverbs device name uverbs0, infiniband_verbs class device path /sys/class/infiniband_verbs/uverbs0, infiniband class device path /sys/class/infiniband/rocep1s0f0, transport: (2) Ethernet
Segmentation fault (core dumped)

 (gdb) bt
 #0  qemu_rdma_accept (rdma=0x0) at ../migration/rdma.c:3272
 #1  rdma_accept_incoming_migration (opaque=0x0) at     ../migration/rdma.c:3986
 #2  0x0000563c9e51f02a in aio_dispatch_handler
     (ctx=ctx@entry=0x563ca0606010, node=0x563ca12b2150) at ../util/aio-posix.c:329
 #3  0x0000563c9e51f752 in aio_dispatch_handlers (ctx=0x563ca0606010) at      ../util/aio-posix.c:372
 #4  aio_dispatch (ctx=0x563ca0606010) at ../util/aio-posix.c:382
 #5  0x0000563c9e4f4d9e in aio_ctx_dispatch (source=<optimized out>,      callback=<optimized out>, user_data=<optimized out>)    at ../util/async.c:306
 #6  0x00007fe96ef3fa9f in g_main_context_dispatch () at      /lib64/libglib-2.0.so.0
 #7  0x0000563c9e4ffeb8 in glib_pollfds_poll () at     ../util/main-loop.c:231
 #8  os_host_main_loop_wait (timeout=12188789) at     ../util/main-loop.c:254
 #9  main_loop_wait (nonblocking=nonblocking@entry=0) at     ../util/main-loop.c:530
 #10 0x0000563c9e3c7211 in qemu_main_loop () at     ../softmmu/runstate.c:725
 #11 0x0000563c9dfd46fe in main (argc=<optimized out>, argv=<optimized     out>, envp=<optimized out>) at ../softmmu/main.c:50

The rdma return path will not be created when qemu incoming is starting
since migrate_copy() is false at that moment, then a  NULL return path
rdma was referenced if the user enabled postcopy later.

Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Message-Id: <20210525080552.28259-3-lizhijian@cn.fujitsu.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Li Zhijian 2021-05-25 16:05:51 +08:00 committed by Dr. David Alan Gilbert
parent f53b450ada
commit 44bcfd45e9
1 changed files with 21 additions and 11 deletions
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32
migration/rdma.c
View file

@ -316,6 +316,7 @@ typedef struct RDMALocalBlocks {
typedef struct RDMAContext {
char *host;
int port;
char *host_port;
RDMAWorkRequestData wr_data[RDMA_WRID_MAX];
@ -2392,7 +2393,9 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
rdma->channel = NULL;
}
g_free(rdma->host);
g_free(rdma->host_port);
rdma->host = NULL;
rdma->host_port = NULL;
}
@ -2648,6 +2651,7 @@ static void *qemu_rdma_data_init(const char *host_port, Error **errp)
if (!inet_parse(addr, host_port, NULL)) {
rdma->port = atoi(addr->port);
rdma->host = g_strdup(addr->host);
rdma->host_port = g_strdup(host_port);
} else {
ERROR(errp, "bad RDMA migration address '%s'", host_port);
g_free(rdma);
@ -3276,6 +3280,7 @@ static int qemu_rdma_accept(RDMAContext *rdma)
.private_data = &cap,
.private_data_len = sizeof(cap),
};
RDMAContext *rdma_return_path = NULL;
struct rdma_cm_event *cm_event;
struct ibv_context *verbs;
int ret = -EINVAL;
@ -3291,6 +3296,20 @@ static int qemu_rdma_accept(RDMAContext *rdma)
goto err_rdma_dest_wait;
}
/*
* initialize the RDMAContext for return path for postcopy after first
* connection request reached.
*/
if (migrate_postcopy() && !rdma->is_return_path) {
rdma_return_path = qemu_rdma_data_init(rdma->host_port, NULL);
if (rdma_return_path == NULL) {
rdma_ack_cm_event(cm_event);
goto err_rdma_dest_wait;
}
qemu_rdma_return_path_dest_init(rdma_return_path, rdma);
}
memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap));
network_to_caps(&cap);
@ -3406,6 +3425,7 @@ static int qemu_rdma_accept(RDMAContext *rdma)
err_rdma_dest_wait:
rdma->error_state = ret;
qemu_rdma_cleanup(rdma);
g_free(rdma_return_path);
return ret;
}
@ -4048,17 +4068,6 @@ void rdma_start_incoming_migration(const char *host_port, Error **errp)
trace_rdma_start_incoming_migration_after_rdma_listen();
/* initialize the RDMAContext for return path */
if (migrate_postcopy()) {
rdma_return_path = qemu_rdma_data_init(host_port, &local_err);
if (rdma_return_path == NULL) {
goto cleanup_rdma;
}
qemu_rdma_return_path_dest_init(rdma_return_path, rdma);
}
qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration,
NULL, (void *)(intptr_t)rdma);
return;
@ -4069,6 +4078,7 @@ err:
error_propagate(errp, local_err);
if (rdma) {
g_free(rdma->host);
g_free(rdma->host_port);
}
g_free(rdma);
g_free(rdma_return_path);