Re: [Xen-devel] PTE Write access is not set

[Tim Deegan <tim@xxxxxxx>]

At 09:57 +0000 on 14 Dec (1323856663), Jan Beulich wrote:
> > (XEN) realmode.c:115:d9 Failed to emulate insn.
> > (XEN) realmode.c:165:d9 Real-mode emulation failed @ e40a:00005f6c: d9
> > 33 01 fc 30 34
> 
> ... if this is Linux I'm having a rather hard time seeing why it would
> enter realmode at normal run time (and then even use floating point
> instructions there). This would be expected at boot time and at most
> during guest-internal suspend/resume, but I'm sure you would have
> mentioned if the guest was in the process of doing the latter (and
> you excluded the former).
> 
> I'm rather suspecting the VM to have gone astray earlier.
> 
> > (XEN) domain_crash called from realmode.c:166
> > (XEN) Domain 9 (vcpu#0) crashed on cpu#6:
> > (XEN) ----[ Xen-4.1.3-rc1-pre  x86_64  debug=n  Not tainted ]----
> > (XEN) CPU:    6
> > (XEN) RIP:    e40a:[<0000000000005f6c>]
> > (XEN) RFLAGS: 0000000000010002   CONTEXT: hvm guest
> > (XEN) rax: 000000000000e7e5   rbx: 0000000000000000   rcx: 00000000000d0000
> > (XEN) rdx: 00000000000001f7   rsi: 0000000000000000   rdi: 0000000000000dba
> > (XEN) rbp: 0000000000000182   rsp: 0000000000000db0   r8:  0000000000000000
> > (XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
> > (XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
> > (XEN) r15: 0000000000000000   cr0: 0000000000000010   cr4: 0000000000000000
> > (XEN) cr3: 0000000000000000   cr2: 0000000000000000
> > (XEN) ds: 9fc0   es: 9e00   fs: 0000   gs: 0000   ss: 9e00   cs: e40a

I'd say the guest has recently rebooted - even if it was going back
down to real mode for some reason, I doubt that cr2 and cr3 would be all
zeros.

Tim.

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