* Li Zhijian (lizhij...@cn.fujitsu.com) wrote:
> 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 <lizhij...@cn.fujitsu.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
> ---
> V2: alloc memory for host_port
> ---
> migration/rdma.c | 32 +++++++++++++++++++++-----------
> 1 file changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/migration/rdma.c b/migration/rdma.c
> index 651534e8255..d829d08d076 100644
> --- a/migration/rdma.c
> +++ b/migration/rdma.c
> @@ -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);
> --
> 2.30.2
>
>
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
