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[Xen-devel] GP fault after live migration of hvm domain

  • To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • Date: Wed, 29 Feb 2012 12:02:51 +0100
  • Delivery-date: Wed, 29 Feb 2012 11:03:30 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xen.org>


during a live migration of a hvm domain with pv-drivers I get a general
protection fault on the target machine just after the domain has been resumed
there. The fault occurs on vcpu 6 when it is trying to access the lapic timer.

Xen version is 4.0.2 (SLES11 SP1), on the console I see:

(XEN) io.c:194:d6 MMIO emulation failed @ 0020:ffff9700ff00de42: 89 b8 80 03 00 

which is exactly the failing instruction in the domain. All registers seem to
be okay, %rax holds the virtual address of the lapic.
Needless to say this routine has no problems in normal cases. The domain was
migrated several times successful.

Has something like this been seen before?


Juergen Gross                 Principal Developer Operating Systems
PDG ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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