From 4d9f675bcb031737cdab44930cab83a4491aa8ff Mon Sep 17 00:00:00 2001 From: Lidong Chen Date: Mon, 6 Aug 2018 21:29:31 +0800 Subject: [PATCH] migration: implement io_set_aio_fd_handler function for RDMA QIOChannel if qio_channel_rdma_readv return QIO_CHANNEL_ERR_BLOCK, the destination qemu crash. The backtrace is: (gdb) bt #0 0x0000000000000000 in ?? () #1 0x00000000008db50e in qio_channel_set_aio_fd_handler (ioc=0x38111e0, ctx=0x3726080, io_read=0x8db841 , io_write=0x0, opaque=0x38111e0) at io/channel.c: #2 0x00000000008db952 in qio_channel_set_aio_fd_handlers (ioc=0x38111e0) at io/channel.c:438 #3 0x00000000008dbab4 in qio_channel_yield (ioc=0x38111e0, condition=G_IO_IN) at io/channel.c:47 #4 0x00000000007a870b in channel_get_buffer (opaque=0x38111e0, buf=0x440c038 "", pos=0, size=327 at migration/qemu-file-channel.c:83 #5 0x00000000007a70f6 in qemu_fill_buffer (f=0x440c000) at migration/qemu-file.c:299 #6 0x00000000007a79d0 in qemu_peek_byte (f=0x440c000, offset=0) at migration/qemu-file.c:562 #7 0x00000000007a7a22 in qemu_get_byte (f=0x440c000) at migration/qemu-file.c:575 #8 0x00000000007a7c78 in qemu_get_be32 (f=0x440c000) at migration/qemu-file.c:655 #9 0x00000000007a0508 in qemu_loadvm_state (f=0x440c000) at migration/savevm.c:2126 #10 0x0000000000794141 in process_incoming_migration_co (opaque=0x0) at migration/migration.c:366 #11 0x000000000095c598 in coroutine_trampoline (i0=84033984, i1=0) at util/coroutine-ucontext.c:1 #12 0x00007f9c0db56d40 in ?? () from /lib64/libc.so.6 #13 0x00007f96fe858760 in ?? () #14 0x0000000000000000 in ?? () RDMA QIOChannel not implement io_set_aio_fd_handler. so qio_channel_set_aio_fd_handler will access NULL pointer. Signed-off-by: Lidong Chen Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/rdma.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/migration/rdma.c b/migration/rdma.c index cfb0671b09..d6bbf28fdc 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -2963,6 +2963,21 @@ static GSource *qio_channel_rdma_create_watch(QIOChannel *ioc, return source; } +static void qio_channel_rdma_set_aio_fd_handler(QIOChannel *ioc, + AioContext *ctx, + IOHandler *io_read, + IOHandler *io_write, + void *opaque) +{ + QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); + if (io_read) { + aio_set_fd_handler(ctx, rioc->rdmain->comp_channel->fd, + false, io_read, io_write, NULL, opaque); + } else { + aio_set_fd_handler(ctx, rioc->rdmaout->comp_channel->fd, + false, io_read, io_write, NULL, opaque); + } +} static int qio_channel_rdma_close(QIOChannel *ioc, Error **errp) @@ -3822,6 +3837,7 @@ static void qio_channel_rdma_class_init(ObjectClass *klass, ioc_klass->io_set_blocking = qio_channel_rdma_set_blocking; ioc_klass->io_close = qio_channel_rdma_close; ioc_klass->io_create_watch = qio_channel_rdma_create_watch; + ioc_klass->io_set_aio_fd_handler = qio_channel_rdma_set_aio_fd_handler; } static const TypeInfo qio_channel_rdma_info = {