xl/xm save -c fails - set_vcpucontext EOPNOTSUPP (was Re: [Xen-devel] xl save -c issues with Windows 7 Ultimate)

[Shriram Rajagopalan <rshriram@xxxxxxxxx>]

I was testing xl/xm checkpoint with the latest c/s in the repo, 23300.
neither xl nor xm seem to work. The error code is 95 (EOPNOTSUPP).

Migration works but not checkpointing. While doing a xc_domain_resume, 

the "modify_returncode" phase (for suspend_cancel) fails. Tracing through 
the control flow, I found that the hypercall for set_vcpucontext 
(in do_xen_hypercall() from xc_private.c) fails with this error code. 

I have tested this with a 64-bit 2.6.39 and 32-bit 2.6.18 pv domU. 
Any help would be great.

shriram

On Fri, May 6, 2011 at 5:01 PM, AP Xen <apxeng@xxxxxxxxx> wrote:

On Tue, May 3, 2011 at 4:07 AM, George Dunlap
<George.Dunlap@xxxxxxxxxxxxx> wrote:

> Have you tried it with other operating systems and found it to work?
> I.e., is it something specific to Windows 7, or is it a general HVM /
> Windows problem?

I tried this with CentOS 5.6 and saw the same behavior.

root@ubuntu:~# xl -vvv save -c centos /etc/xen/centoschk
Saving to /etc/xen/centoschk new xl format (info 0x0/0x0/255)
libxl: debug: libxl_dom.c:384:libxl__domain_suspend_common_callback
issuing PVHVM suspend request via XenBus control node
libxl: debug: libxl_dom.c:389:libxl__domain_suspend_common_callback
wait for the guest to acknowledge suspend request
libxl: debug: libxl_dom.c:434:libxl__domain_suspend_common_callback
guest acknowledged suspend request

libxl: debug: libxl_dom.c:438:libxl__domain_suspend_common_callback
wait for the guest to suspend
libxl: debug: libxl_dom.c:450:libxl__domain_suspend_common_callback
guest has suspended
xc: debug: outbuf_write: 4194304 > 90092@16687124
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500
xc: debug: outbuf_write: 4194304 > 4169716@12607500

xc: detail: type fail: page 0 mfn 000f2000
xc: detail: type fail: page 1 mfn 000f2001
xc: detail: type fail: page 2 mfn 000f2002
xc: detail: delta 9371ms, dom0 25%, target 0%, sent 920Mb/s, dirtied

0Mb/s 0 pages
xc: detail: Total pages sent= 263168 (0.25x)
xc: detail: (of which 0 were fixups)
xc: detail: All memory is saved
xc: detail: Save exit rc=0

libxl: debug: libxl_dom.c:534:libxl__domain_save_device_model Saving

device model state to /var/lib/xen/qemu-save.7

libxl: debug: libxl_dom.c:546:libxl__domain_save_device_model Qemu
state is 7204 bytes

root@ubuntu:~# xl list

Name                                        ID   Mem VCPUs      State   Time(s)

Domain-0                                    0  2914     4     r-----    6576.4
centos                                        7  1019     2     ---ss-     575.4

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