[Xen-devel] Re: Xen bug or VMware bug?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25/12/07 10:16, "Kip Macy" <kip.macy@xxxxxxxxx> wrote:

> Correct. Just start it up on a PAE xen.
> 
> As it turns out *any* in-place updates to the L3 - even putting a zero
> where there is currently a zero - will cause a system reset. At least
> on VMWare Fusion. I've worked around it for the moment by allocatng a
> new L3 and then switching to that.

I can't reproduce this with xen-3.1-testing.hg c/s 15547 on real hardware.
Although the domain does crash in a fairly intricate and interesting way.
I've appended the Xen logging of the domain crash. I assume your 'whole
machine' crash is simply inaccurate emulation of native behaviour by VMware
Fusion.

 -- Keir

#8, proc0kstack=3227074560
xen_setbootenv(): cmd_line='root=/dev/hda1 ro 4'
gdt=0xc0596000
PTmap=0xbf800000
(XEN) Unhandled page fault in domain 1 on VCPU 0 (ec=0000)
(XEN) Pagetable walk from bfe02cb4:
(XEN)  L3[0x002] = 00000000aec46001 0000059c
(XEN)  L2[0x1ff] = 0000000000000000 ffffffff
(XEN) domain_crash_sync called from entry.S (ff17f5a2)
(XEN) Domain 1 (vcpu#0) crashed on cpu#3:
(XEN) ----[ Xen-3.1.3-rc1-devel  x86_32p  debug=y  Not tainted ]----
(XEN) CPU:    3
(XEN) EIP:    e019:[<c040a7e7>]
(XEN) EFLAGS: 00000206   CONTEXT: guest
(XEN) eax: 000c0596   ebx: 00000098   ecx: deadbeef   edx: deadbeef
(XEN) esi: c04f2184   edi: 00000000   ebp: c0595d84   esp: c0595bf4
(XEN) cr0: 8005003b   cr4: 000026f0   cr3: 00260d20   cr2: bfe02cb4
(XEN) ds: e021   es: e021   fs: e021   gs: e021   ss: e021   cs: e019
(XEN) Guest stack trace from esp=c0595bf4:
(XEN)    00000000 c040a7e7 0001e019 00010006 c0492b92 bf800000 00000000
00000001
(XEN)    00000000 00000000 00000001 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000
(XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000



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