linux-kernel - Re: 2.6.31.5 x86-64 KVM: 'emulation failed (pagetable) rip 7fb49335da7b 66 0f 7f 07'

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Date:	Sun, 29 Nov 2009 12:43:29 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Nix <nix@...eri.org.uk>
CC:	kvm@...r.kernel.org,
	Linux-Kernel-Mailing-List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.31.5 x86-64 KVM: 'emulation failed (pagetable) rip 7fb49335da7b
 66 0f 7f 07'

On 11/27/2009 11:56 PM, Nix wrote:
> So I installed my first KVM guest image (a prerelease of Ubuntu 9.10
> that I had lying around) this morning (through virt-manager, as it
> happens). Everything worked fine, the install was searingly fast
> compared to the UML virtual machines I'm used to.
>
> I got back to it this evening, restarted the VM, and found that it had
> suddenly slowed right down again, with one CPU being saturated with work
> even when nothing was happening. Looking at the syslog shows (what would
> be but for ratelimit) incredible numbers of these messages being logged:
>
> Nov 27 21:44:00 spindle info: [444857.792205] device vnet0 entered promiscuous mode
> Nov 27 21:44:00 spindle info: [444857.794347] linux-net: port 2(vnet0) entering learning state
> Nov 27 21:44:03 spindle warning: [444860.856640] __ratelimit: 928705 callbacks suppressed
> Nov 27 21:44:03 spindle err: [444860.856729] emulation failed (pagetable) rip 7f3845f36a7b 66 0f 7f 07
>    

66 0f 7f 07              movdqa %xmm0,(%rdi)

which we don't emulate.

Can you, using the qemu monitor, see where the guest is trying to write?

   (qemu) info registers
   (qemu) x/30i $eip - 20


-- 
error compiling committee.c: too many arguments to function

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