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[Xen-devel] FC15: 32-bit PV guest crash on restore on x64_86 host

On restore 32bit PV guest crashes on x64_86 host, while  x64_86 PV guest
works as expected.

Bisecting of upstream kernel shows following offending commit:

commit 448f2831934381e9d3c4d93e700ba7bbe14612dc
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date:   Wed Dec 15 13:19:33 2010 +0000

    xen: add m2p override mechanism

More details from https://bugzilla.redhat.com/show_bug.cgi?id=700752

excerpt from hypervisor.log:

(XEN) mm.c:630:d16 Non-privileged (16) attempt to map I/O space 2712536c5e
(XEN) mm.c:3619:d16 ptwr_emulate: fixing up invalid PAE PTE c082712536c5e063
(XEN) /builddir/build/BUILD/kernel-2.6.18/xen/include/asm/mm.h:225:d16 Error
pfn 36c5b: rd=ffff8300afdca080, od=ffff8300af1f0080, caf=80000002,
(XEN) mm.c:654:d16 Error getting mfn 36c5b (pfn 3b325b) from L1 entry
0000000036c5b063 for dom16
(XEN) mm.c:3619:d16 ptwr_emulate: fixing up invalid PAE PTE 0000000036c5b063
(XEN) Pagetable walk from 00000000eb40ff98:
(XEN)  L4[0x000] = 0000000066ad4027 0000000000027494
(XEN)  L3[0x003] = 0000000066eae027 0000000000027492
(XEN)  L2[0x15a] = 0000000237400067 0000000000001600
(XEN)  L1[0x00f] = 80000002373f8061 000000000002b40f
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 16 (vcpu#0) crashed on cpu#1:
(XEN) ----[ Xen-3.1.2-257.el5  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    1
(XEN) RIP:    0061:[<00000000c04047ee>]
(XEN) RFLAGS: 0000000000010213   CONTEXT: guest
(XEN) rax: 00000000f4d78000   rbx: 00000000eb4aea40   rcx: 000000000000007b
(XEN) rdx: 00000000eb4aea40   rsi: 00000000eb410024   rdi: 00000000c0827117
(XEN) rbp: 00000000eb40ffa0   rsp: 00000000eb40ffa0   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4: 00000000000006f0
(XEN) cr3: 0000000250002000   cr2: 00000000f4d78008
(XEN) ds: 007b   es: 007b   fs: 00d8   gs: 00e0   ss: 0069   cs: 0061
(XEN) Guest stack trace from esp=eb40ffa0:
(XEN)   eb41001c c0827152 36c5d063 80000002 36c5c063 80000002 36c5b062 00000000
(XEN)   00000008 eb4aea40 00000000 80000002 36c58063 80000002 36c57063 80000002
(XEN)   36c56063 80000002 36c55063 80000002 36c54063 80000002 36c53063 80000002
(XEN) mm.c:630:d0 Non-privileged (16) attempt to map I/O space 00000000

gdb guest kernel stack trace:
#0  0xc04047ee in xen_read_cr2 () at arch/x86/xen/mmu.c:1244
#1  0xc0827152 in read_cr2 (regs=0xeb410024, error_code=0)
#2  do_page_fault (regs=0xeb410024, error_code=0) at arch/x86/mm/fault.c:974
#3<signal handler called>

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