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Re: [Qemu-devel] [Qemu-trivial] [PATCH v2] serial-pci: Set prog interfac

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [Qemu-trivial] [PATCH v2] serial-pci: Set prog interface field of pci config to 16550 compatible
Date: Wed, 14 May 2014 13:06:34 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Il 14/05/2014 12:59, BALATON Zoltan ha scritto:
On Wed, 14 May 2014, Michael S. Tsirkin wrote:
On Wed, May 14, 2014 at 01:39:03AM +0200, BALATON Zoltan wrote:
On Thu, 8 May 2014, Michael Tokarev wrote:
27.02.2014 05:05, BALATON Zoltan wrote:

Shoudl we actually make it machine-specific, to keep even prog-if value
of these things the same as before for older machine types?  I dunno.
mst says we should, I think this is not a very important property to

So what's the decision? Can it be taken as it is now or do you want
any more changes? (If you want it version specific then please tell
me how to do that or show me an example because I don't know how to
do that.)

If you change it migration to old qemu breaks.

This is unlikely as this pci serial card is not used by default in any
machine version AFAIK. Is it still desired to keep backward
compatibility for a device that can only be added by users explicitely?

Yes, after all not even virtio-blk is used by default.


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