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Re: [Qemu-stable] [PATCH v3 1/4] serial: reset thri_pending on IER write
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-stable] [PATCH v3 1/4] serial: reset thri_pending on IER writes with THRI=0 |
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Date: |
Mon, 15 Dec 2014 14:34:25 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
On 15/12/2014 14:30, Dr. David Alan Gilbert wrote:
> Anyone who really cares about backwards migration compatibility would
> probably have to guard the subsection with the machine-type to avoid
> (e) ever happening (the heuristic from (c) might be useful to add).
Right.
> although if you do have to recut it, please clarify the text that says
> 'and is enough to fix migration.' since it doesn't quite.
Ok, I'll clarify this, specifying which case remains broken by design.
> (This is an interesting example where with a migration format that allowed
> 'optional' subsections you wouldn't break backwards migration if the
> reader could ignore a section marked as such that it didn't recognise).
Right, the question is whether you really want to do this. :)
Paolo