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Re: [Qemu-ppc] [PATCH] target/ppc: Fix backwards migration of msr_mask

From: Simon Guo
Subject: Re: [Qemu-ppc] [PATCH] target/ppc: Fix backwards migration of msr_mask
Date: Wed, 4 Apr 2018 11:27:44 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, Mar 20, 2018 at 01:23:19PM +1100, David Gibson wrote:
> 21b786f "PowerPC: Add TS bits into msr_mask" added the transaction states
> to msr_mask for recent POWER CPUs to allow correct migration of machines
> that are in certain interim transactional memory states.
> This was correct, but unfortunately breaks backwards of pseries-2.7 and
> earlier machine types which (stupidly) transferred the msr_mask in the
> migration stream and failed if it wasn't equal on each end.
> This works around the problem by masking out the new MSR bits in the
> compatibility code to send the msr_mask on old machine types.
> Signed-off-by: David Gibson <address@hidden>

Sorry I didn't consider the backward compatibility in previous
commit. Thanks for fix that.

- Simon

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