Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock

[Peter Zijlstra]

On Tue, Feb 18, 2014 at 07:42:20PM -0500, Waiman Long wrote:
> On 02/18/2014 04:28 PM, Peter Zijlstra wrote:
> >On Tue, Feb 18, 2014 at 02:30:12PM -0500, Waiman Long wrote:
> >>I will start looking at how to make it work with paravirt. Hopefully, it
> >>won't take too long.
> >The cheap way out is to simply switch to the test-and-set spinlock on
> >whatever X86_FEATURE_ indicates a guest I suppose.
> 
> I don't think there is X86_FEATURE flag that indicates running in a guest.
> In fact, a guest should never find out if it is running virtualized.

No it very much should; how else is paravirt ever going to work?
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