From: Paolo Bonzini <pbonzini@redhat.com>
To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: imammedo@redhat.com, batuzovk@ispras.ru, andrey@xdel.ru,
qemu-stable@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v3 1/4] serial: reset thri_pending on IER writes with THRI=0
Date: Mon, 15 Dec 2014 14:45:36 +0100 [thread overview]
Message-ID: <548EE600.9010307@redhat.com> (raw)
In-Reply-To: <20141215133719.GE5502@work-vm>
On 15/12/2014 14:37, Dr. David Alan Gilbert wrote:
>> > Right, the question is whether you really want to do this. :)
> Well, it would solve this type of problem less painfully, your migration
> would always succeed and destinations that knew what to do with it would
> always do the right thing.
Yes, that's a determination to make. I agree that this particular case
is one where losing the subsection is not the end of the world, and
keying off the machine type could be a good call for downstreams.
But that's also because downstreams can also patch older source
versions, while QEMU will not release another 2.1 version. In fact...
> Of course you could also solve the problem
> if the source knew the version of the destination, but you didn't like
> that idea either.
... if the source could be patched by someone to know the version of the
destination, they could also add the subsection with a "needed" function
that always returns 0. This way it is never migrated, but it is
interpreted. You do not need the version of the destination.
Paolo
next prev parent reply other threads:[~2014-12-15 13:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-12 12:43 [Qemu-devel] [PATCH v3 0/4] serial fixes, including 2.2->2.1 migration Paolo Bonzini
2014-12-12 12:44 ` [Qemu-devel] [PATCH v3 1/4] serial: reset thri_pending on IER writes with THRI=0 Paolo Bonzini
2014-12-15 10:46 ` Dr. David Alan Gilbert
2014-12-15 11:51 ` Paolo Bonzini
2014-12-15 13:30 ` Dr. David Alan Gilbert
2014-12-15 13:34 ` Paolo Bonzini
2014-12-15 13:37 ` Dr. David Alan Gilbert
2014-12-15 13:45 ` Paolo Bonzini [this message]
2014-12-12 12:44 ` [Qemu-devel] [PATCH v3 2/4] serial: clean up THRE/TEMT handling Paolo Bonzini
2014-12-15 11:40 ` Dr. David Alan Gilbert
2014-12-15 12:03 ` Paolo Bonzini
2014-12-15 15:21 ` Dr. David Alan Gilbert
2014-12-15 15:26 ` Paolo Bonzini
2014-12-15 15:29 ` Dr. David Alan Gilbert
2014-12-12 12:44 ` [Qemu-devel] [PATCH v3 3/4] serial: update LSR on enabling/disabling FIFOs Paolo Bonzini
2014-12-15 15:50 ` Dr. David Alan Gilbert
2014-12-15 15:52 ` Paolo Bonzini
2014-12-12 12:44 ` [Qemu-devel] [PATCH v3 4/4] serial: only resample THR interrupt on rising edge of IER.THRI Paolo Bonzini
2014-12-15 16:05 ` Dr. David Alan Gilbert
2014-12-15 16:10 ` Paolo Bonzini
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