On Mon, 24 Nov 2014, Andrew Cooper wrote:
On 24/11/14 12:41, Wei Liu wrote:
On Sat, Nov 22, 2014 at 07:24:21PM +0000, M A Young wrote:
While investigating a bug reported on Red Hat Bugzilla
https://bugzilla.redhat.com/show_bug.cgi?id=1166461
I discovered the following
xl migrate --debug domid localhost does indeed fail for Xen 4.4 pv (the bug
report is for Xen 4.3 hvm ) when xl migrate domid localhost works. There are
actually two issues here
* the segfault in libxl-save-helper --restore-domain (as reported in the bug
above) occurs if the guest memory is 1024M (on my 4G box) and is presumably
because the allocated memory eventually runs out
* the segfault doesn't occur if the guest memory is 128M, but the migration
still fails. The first attached file contains the log from a run with xl -v
migrate --debug domid localhost (with mfn and duplicated lines stripped out
to make the size manageable).
I then tried xen 4.5-rc1 to see if the bug was fixed and found that xl
migrate doesn't work for me at all - see the second attached file for the
output of xl -v migrate domid localhost .
Mchael Young
[...]
xc: detail: delta 15801ms, dom0 95%, target 0%, sent 543Mb/s, dirtied 0Mb/s 314
pages
xc: detail: Mapping order 0, 268; first pfn 3fcf4
xc: detail: delta 23ms, dom0 100%, target 0%, sent 447Mb/s, dirtied 0Mb/s 0
pages
xc: detail: Start last iteration
xc: Reloading memory pages: 262213/262144 100%xc: detail: SUSPEND shinfo
00082fbc
xc: detail: delta 17ms, dom0 58%, target 58%, sent 0Mb/s, dirtied 1033Mb/s 536
pages
xc: detail: delta 8ms, dom0 100%, target 0%, sent 2195Mb/s, dirtied 2195Mb/s
536 pages
xc: detail: Total pages sent= 262749 (1.00x)
xc: detail: (of which 0 were fixups)
xc: detail: All memory is saved
xc: error: Error querying maximum number of MSRs for VCPU0 (1 = Operation not
permitted): Internal error
Per your description this is the output of "xl -v migrate domid
localhost", so no "--debug" is involved. (Just to make sure...)
This error message means a domctl fails, which should be addressed
first?
FWIW I tried "xl -v migrate domid localhost" for a PV guest it worked
for me. :-(
Is there anything I need to do to trigger this failure?
Is XSM in use? I can't think of any other reason why that hypercall
would fail with EPERM.
XSM is built in (I wanted to allow the option of people using it) but I
didn't think it was active.
Michael Young
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