Re: [KVM timekeeping 11/35] Add helper functions for time computation

[Zachary Amsden]

On 08/20/2010 07:34 AM, Glauber Costa wrote:
> On Thu, Aug 19, 2010 at 10:07:25PM -1000, Zachary Amsden wrote:
>    
> > Add a helper function to compute the kernel time and convert nanoseconds
> > back to CPU specific cycles.  Note that these must not be called in preemptible
> > context, as that would mean the kernel could enter software suspend state,
> > which would cause non-atomic operation.
> >
> > Also, convert the KVM_SET_CLOCK / KVM_GET_CLOCK ioctls to use the kernel
> > time helper, these should be bootbased as well.
> >      
> This is one of the things I believe should be applied right now.
> Maybe we want a cut version of this patch, that exposes this API while
> adjusting KVM_SET_CLOCK / KVM_GET_CLOCK to get in early rather than late?
>    

The first half of the series, at least, is good to go upstream and ready 
for backport.  The trapping and later stuff obviously needs to get some 
upstream testing.
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