Re: [Qemu-devel] [PULL 00/12] ppc-for-2.12 queue 20180108

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Jan 10, 2018 at 02:33:41PM +0100, Paolo Bonzini wrote:
> On 10/01/2018 02:55, David Gibson wrote:
> > On Tue, Jan 09, 2018 at 03:15:25PM +0000, Peter Maydell wrote:
> >> On 9 January 2018 at 12:16, David Gibson <david@gibson.dropbear.id.au> wrote:
> >>> Thanks.  Even if you can identify which patch it is and we can
> >>> postpone that one would be a bug help.
> >>
> >> Bisection blames this one:
> >>
> >> pbonzini@redhat.com (1):
> >>       target-ppc: optimize cmp translation
> > 
> > Aha!  Ok, I'll pull that one out until we find a fix.
> 
> Richard posted one, it's an ARM32 backend bug.
> 
> > [snip]
> >> (This is a build for arm32, running in a chroot on an aarch64
> >> box, non-debug build.)
> > 
> > Ah.. but since it's a chroot, still an aarch64 cpu behind it all.
> 
> No, it's running 32-bit ARM code.

Ah.  But maybe a different version to older ARM32s?

I'm trying to figure out why I entirely failed to reproduce this on a
Raspberry Pi 1 (and a couple of other arm32 machines, but I forget the
details of them).

>   I
> > think the machines I managed to borrow were all much older slower
> > really truly arm32 machines, which I guess didn't show the problem.
> > 
> > Oh.. and probably a debug (default) build as well.
> > 
> 

-- 
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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