[Xen-devel] Xen 4.2.1 live migration with qemu device model

[Alex Bligh <alex@xxxxxxxxxxx>]

In this email message:
http://www.gossamer-threads.com/lists/xen/devel/256737
a patch to libxl_domain_suspend is presented to enable live migrate
with the qemu device model in xen-unstable. This patch has *NOT*
been taken into the 4.2.1 tree (as far as I can see).

In 4.2.0, adding this patch and attempting a live migrate using
the qemu device model (using xl) produces a seg fault due to
unitialised variables.

Should I expect live-migrate of qemu-dm vms to work under 4.2.1?
If so, should the patch (or a modification thereof) to remove
the check from libxl_domain_suspend be applied to 4.2.1-testing
or is there more to do?

I am very happy to commit test resources to this.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffeffff700 (LWP 5995)]
0x00007ffff5a0862a in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff5a0862a in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff6d4e970 in libxl__domain_suspend_common_switch_qemu_logdirty 
(domid=<optimized out>, enable=<optimized out>, user=0x7ffff00024e8) at 
libxl_dom.c:728
#2  0x00007ffff6d5c1ae in libxl__srm_callout_received_save (msg=0x7fffefffe41a " 
error", len=<optimized out>, user=0x7ffff00024e8) at _libxl_save_msgs_callout.c:162
#3  0x00007ffff6d5b736 in helper_stdout_readable (egc=0x7fffefffe5a0, ev=0x7ffff0002560, 
fd=38, events=<optimized out>, revents=<optimized out>) at 
libxl_save_callout.c:283
#4  0x00007ffff6d601f1 in afterpoll_internal (egc=0x7fffefffe5a0, 
poller=0x7ffff00028c0, nfds=4, fds=0x7ffff00048b0, now=...) at libxl_event.c:948
#5  0x00007ffff6d604db in eventloop_iteration (egc=0x7fffefffe5a0, 
poller=0x7ffff00028c0) at libxl_event.c:1368
#6  0x00007ffff6d616b3 in libxl__ao_inprogress (ao=0x7ffff0001d40, file=<optimized out>, 
line=<optimized out>, func=<optimized out>) at libxl_event.c:1614
#7  0x00007ffff6d3ab75 in libxl_domain_suspend (ctx=<optimized out>, domid=1, fd=10, 
flags=<optimized out>, ao_how=<optimized out>) at libxl.c:796
#8  0x000000000043677e in migrate_domain_send (ctx=0x7ffff0008860, domid=1, 
fd=10) at hypervisor/xen_libxl.c:587
#9  0x000000000043698a in live_migrate_send (hyperconn=0x7ffff0001c70, 
server=0x7ffff0001cb0, node_ip=0x7ffff00041e0 "10.157.128.20", fd=10) at 
hypervisor/xen_libxl.c:647
#10 0x0000000000422a70 in migrate_server_action (request=0x7ffff0002980) at 
action/node_action.c:1287
#11 0x00000000004240c1 in runAction (socket_fd=8) at action/handleaction.c:138
#12 0x00000000004179bd in runcomm (socket=0x8) at xvpagent.c:253
#13 0x0000000000427502 in trackedthread_run (arg=0x66df20) at util/util.c:179
#14 0x00007ffff5c9ce9a in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#15 0x00007ffff59ca4bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#16 0x0000000000000000 in ?? ()


--
Alex Bligh

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