Re: [Xen-devel] [PATCH v3 7/9] xen/arm: vgic: Optimize the way to store the target vCPU in the rank

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 8 Oct 2015, Ian Campbell wrote:
> > If the concern is the behavior is changed, I'm happy to rework this code
> > to keep exactly the same behavior. I.e any 32-bit write containing
> > a 0 byte will be ignored. This is not optimal but at least I'm not
> > opening the pandora box of fixing every single error in the code touch
> > by this series.
> 
> I'm okay with the new behaviour, I think Stefano was willing to tolerate it
> (based on <alpine.DEB.2.02.1510081220190.1179@xxxxxxxxxxxxxxxxxxxxxxx>).
> 
> So if we aren't going to fix it to DTRT WRT writing zero to a target then I
> think we can go with the current variant and not change to ignoring any
> word with a zero byte in it.
 
OK.

BTW it would be interesting to see how real hardware behaves in this
regard. I seem to recall that X-Gene was ignoring 0 writes too.

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