linux-kernel - Re: [BUG] kvm: guest can not startup due to triple fault

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Message-ID: <4CBC964B.6000605@zytor.com>
Date:	Mon, 18 Oct 2010 11:47:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Dave Young <hidave.darkstar@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Jan Kiszka <jan.kiszka@....de>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] kvm: guest can not startup due to triple fault

On 10/18/2010 07:06 AM, Avi Kivity wrote:
>   On 10/18/2010 03:58 PM, Dave Young wrote:
>>>
>>>  Please patch hardware_setup() to show the value of
>>>  boot_cpu_has(X86_FEATURE_NX).
>>
>> It's 0
> 
> Well, that's ridiculous.  Looking back at your /proc/cpuinfo:
> 
>> processor	: 0
>> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida dts tpr_shadow vnmi flexpriority
>>
>> processor	: 1
>> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida dts tpr_shadow vnmi flexpriority
> 
> processor 0 doesn't have nx.
> 
> Ingo, Peter, any ideas?  Where did the missing feature go?
> 

I don't see the original report -- in particular I can't see the kernel
version -- but I suspect this *might* be an instance of the same bug
fixed in mainline by checkin d900329e20f4476db6461752accebcf7935a8055
(for backporting 1dedefd1a066a795a87afca9c0236e1a94de9bf6 is also
needed; these both should be in -stable or on the way there.)

	-hpa
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