Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

[Avi Kivity <avi@xxxxxxxxxx>]

On 10/12/2009 09:13 PM, Jeremy Fitzhardinge wrote:
> On 10/12/09 11:29, Avi Kivity wrote:
>    
> > Good catch.  Doesn't that invalidate rdtscp based vgettimeofday on
> > non-virt as well (assuming p == cpu)?
> >      
> The tsc clocksource assumes the tsc is (mostly?) synced; it doesn't use
> rdtscp or make any attempt at per-cpu corrections.
>    
So it's broken or disabled when that assumption is wrong?  We could 
easily fix that now.  Might even reuse the pvclock structures.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.


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