[PATCH 0/2] powerpc/xive: fix CPU hot unplug

David Gibson david at gibson.dropbear.id.au
Tue Oct 3 14:36:15 AEDT 2017


On Mon, Oct 02, 2017 at 06:27:20PM +0200, Cédric Le Goater wrote:
> On 09/23/2017 10:26 AM, Cédric Le Goater wrote:
> > Hi,
> > 
> > Here are a couple of small fixes to support CPU hot unplug. There are
> > still some issues to be investigated as, in some occasions, after a
> > couple of plug and unplug, the cpu which was removed receives a 'lost'
> > interrupt. This showed to be the decrementer under QEMU.
> 
> So this seems to be a QEMU issue only which can be solved by 
> removing the DEE bit from the LPCR on P9 processor when the CPU 
> is stopped in rtas. PECE3 bit on P8 processors. 
> 
> I think these patches are valuable fixes for 4.14. The first 
> is trivial and the second touches the common xive part but it
> is only called on the pseries platform.  
> 
> Could you please take a look ?

Sorry, I think I've missed something here.

Is there a qemu bug involved in this?  Has there been a patch sent
that I didn't spot?

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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