[Xen-devel] Regression since Linux Kernel 3.12 due to 64bit pvguest NMIs

[Sebastian Faerber <faerber@xxxxxxxxx>]

Hi,

i'm running into problems booting Kernel 3.12 (and newer) as a PV
guest on a CentOS 5 Xen Hypervisor and dom0.
I tracked this problem down to the commit
6efa20e49b9cb1db1ab66870cc37323474a75a13 (xen: Support 64-bit PV guest
receiving NMIs)

Host CPU is a Intel Xeon L5630

(XEN) traps.c:405:d12 Unhandled invalid opcode fault/trap [#6] in
domain 12 on VCPU 0 [ec=0000]
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 12 (vcpu#0) crashed on cpu#4:
(XEN) ----[ Xen-3.1.2-371.8.1.el5  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    4
(XEN) RIP:    e033:[<ffffffff810041fd>]
(XEN) RFLAGS: 0000000000000282   CONTEXT: guest
(XEN) rax: ffffffffffffffea   rbx: 0000000000000000   rcx: ffffffff81b6f078
(XEN) rdx: 0000000000000000   rsi: ffffffff81a01ee0   rdi: 0000000000000000
(XEN) rbp: ffffffff81afd020   rsp: ffffffff81a01ea8   r8:  0000000000000000
(XEN) r9:  ffff880000000000   r10: 0000000000007ff0   r11: 00000000ffffffff
(XEN) r12: 0000000001000000   r13: ffffffff81a01fa0   r14: 0000000000001000
(XEN) r15: 0000000000000000   cr0: 0000000080050033   cr4: 00000000000026b0
(XEN) cr3: 000000095083a000   cr2: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
(XEN) Guest stack trace from rsp=ffffffff81a01ea8:
(XEN)    ffffffff81b6f078 00000000ffffffff ffffffff810041fd 000000010000e030
(XEN)    0000000000010082 ffffffff81a01ee0 000000000000e02b ffffffff00010004
(XEN)    ffffffff8171df10 ffffffff81a8b634 ffffffff00010001 ffffffff8171f4d0
(XEN)    0000000000000000 ffffffff81a8dbe0 0000000000000000 ffffffff81713916
(XEN)    ffffffff81a24de0 ffffffff00000010 ffffffff81a01f88 ffffffff81a01f48
(XEN)    ffffffff81b7401a ffffffffffffffff ffffffff81afd020 0000000000000000
(XEN)    0000000000000000 0000000000000000 0000000000000000 ffffffff81a87b11
(XEN)    ffffffff81b78810 ffffffff819292a8 0000000000000000 ffffffff81087747
(XEN)    0000000000000000 0000000080000000 0000000000000000 0000000000000000
(XEN)    0000000000000000 ffffffff81a8ad9a 0000000000000000 0000000100000000
(XEN)    20200800000206c2 0f89837180982221 0000000000000000 0f00000060c0c748
(XEN)    ccccccccccccc305 cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc
(XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc cccccccccccccccc

I admit the Xen Version in CentOS 5 is very old but maybe someone
could take a look?
I'm happy to test patches or try to get more information if needed.

Regards,

Sebastian

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