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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, May 04, 2011 at 09:58:01PM +0200, Igor Mammedov wrote:
> 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:

Can you try the patches in devel/p2m-e820-pci.v2
(git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git)



> 
> 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:

Can you attach the full bootup log of the DomU? I am curios of the
memory layout. And also the guest config.

> 
> (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,
> taf=00000000e8000001
> (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)
>     at
> /usr/src/debug/kernel-2.6.38.fc15/linux-2.6.38.i686/arch/x86/include/asm/paravirt.h:64
> #2  do_page_fault (regs=0xeb410024, error_code=0) at arch/x86/mm/fault.c:974
> #3<signal handler called>
> ...
> 
> 
> 

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