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Re: [Xen-devel] Intermittent fatal page fault with XEN 4.3.1 (Centos 6.3 DOM0 with linux kernel 3.10.16.)

>>> On 07.11.13 at 17:02, <Jeff_Zimmerman@xxxxxxxxxx> wrote:

> On Nov 7, 2013, at 7:57 AM, Jan Beulich <JBeulich@xxxxxxxx>
>  wrote:
>>>>> On 07.11.13 at 16:41, <Jeff_Zimmerman@xxxxxxxxxx> wrote:
>>> On Nov 7, 2013, at 1:30 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx>  wrote:
>>>> I was also wondering about the behaviour of using vmx instructions in a
>>>> guest despite vmx not being visible in cpuid...
>>> We have found in our situation this is exactly the case. To verify we wrote 
>>> some
>>> test code that makes vmx calls without checking cupid. On bare hardware the 
>>> program
>>> executes as expected. In a VM on Xen it causes the hypervisor to panic.
>> You trying it doesn't yet imply that Windows also does so.
>> Also, you say "program" - are you using these from user mode code?
> Yes, from windows run as a privileged user. Windows XP sp3 can cause the 
> crash.
> It seems windows 7 has better security, we cannot crash the system from a 
> win7 guest.

Which is sort of odd. Anyway - care to try the attached patch?


Attachment: xsa75.patch
Description: Text document

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