Messages in this thread | | | Date | Wed, 19 Feb 2014 09:51:07 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock |
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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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