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Re: [Xen-devel] Re: xen/stable 32bit dom0 kernel crashes early

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: xen/stable 32bit dom0 kernel crashes early on boot
From: M A Young <m.a.young@xxxxxxxxxxxx>
Date: Fri, 19 Mar 2010 22:20:03 +0000 (GMT)
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <kliw@xxxxxxxxxx>
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On Thu, 18 Mar 2010, Jeremy Fitzhardinge wrote:

(gdb) x/i 0xc0405dbe
0xc0405dbe<xen_set_pte+137>:   mov    %edx,(%ebx)

(gdb) list *0xc0405dbe
0xc0405dbe is in xen_set_pte (arch/x86/xen/mmu.c:703).
698 ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
700     #ifdef CONFIG_X86_PAE
701             ptep->pte_high = pte.pte_high;
702             smp_wmb();
703             ptep->pte_low = pte.pte_low;
704     #else
705             *ptep = pte;
706     #endif
707     }

Xen is 32 bit, right?

Could you disassemble this whole function, so I can see what register the other half is in? (I'm guessing its ecx or esi; nothing else makes much sense.)

I submitted an earlier report with a more complete dump of this function, which is at http://lists.xensource.com/archives/html/xen-devel/2010-02/msg00844.html The code may have changed slightly since then but it looks to be the same issue.

        Michael Young

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