May or may not related Xen messages:

(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000040001000000 to 0xc008040001000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc000010101000000 to 0xc008010101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010004 from 0x0000fffcaf83dad0 to 0x0000fffcaf83252f.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000040001000000 to 0xc008040001000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc000010101000000 to 0xc008010101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000040001000000 to 0xc008040001000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc000010101000000 to 0xc008010101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000040001000000 to 0xc008040001000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc000010101000000 to 0xc008010101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 0000000000000413 from 0xc00c0ffe01000000 to 0xc0080ffe01000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000050101000000 to 0xc008050101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc00001c101000000 to 0xc00801c101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 0000000000000413 from 0xc00c0ffe01000000 to 0xc0080ffe01000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000050101000000 to 0xc008050101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc00001c101000000 to 0xc00801c101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 0000000000000413 from 0xc00c0ffe01000000 to 0xc0080ffe01000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000050101000000 to 0xc008050101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc00001c101000000 to 0xc00801c101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 0000000000000413 from 0xc00c0ffe01000000 to 0xc0080ffe01000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000408 from 0xc000050101000000 to 0xc008050101000000.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0000409 from 0xc00001c101000000 to 0xc00801c101000000.
(XEN) mm.c:874: d0: Forcing read-only access to MFN e0002
(XEN) Fail change to ondemand governor
(XEN) Fail change to ondemand governor
(XEN) Fail change to ondemand governor
(XEN) Fail change to ondemand governor
(XEN) Fail change to ondemand governor
(XEN) Fail change to ondemand governor
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.
(XEN) traps.c:2584:d0 Domain attempted WRMSR 00000000c0010020 from 0x0000000000000000 to 0xffff880003cb9c00.