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Message-ID: <513491B6.6050706@redhat.com>
Date: Mon, 04 Mar 2013 13:21:10 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Gleb Natapov <gleb@...hat.com>
CC: Hu Tao <hutao@...fujitsu.com>, kvm list <kvm@...r.kernel.org>,
qemu-devel <qemu-devel@...gnu.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Daniel P. Berrange" <berrange@...hat.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Jan Kiszka <jan.kiszka@...mens.com>,
Blue Swirl <blauwirbel@...il.com>,
Eric Blake <eblake@...hat.com>,
Andrew Jones <drjones@...hat.com>,
Marcelo Tosatti <mtosatti@...hat.com>,
Sasha Levin <levinsasha928@...il.com>,
Luiz Capitulino <lcapitulino@...hat.com>,
Anthony Liguori <aliguori@...ibm.com>,
Markus Armbruster <armbru@...hat.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Juan Quintela <quintela@...hat.com>,
Orit Wasserman <owasserm@...hat.com>,
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"Michael S. Tsirkin" <mst@...hat.com>,
Alexander Graf <agraf@...e.de>,
Alex Williamson <alex.williamson@...hat.com>,
Peter Maydell <peter.maydell@...aro.org>
Subject: Re: [PATCH v13 0/8] pv event interface between host and guest
Il 04/03/2013 12:52, Gleb Natapov ha scritto:
> > Same here, you can remove the panic event port and add debugcon at
> > 0x505. That's the problematic case. But if the user goes to that
> > length, I think we can honestly say we don't care.
>
> IMO there is a big difference between well know serial ISA ports and
> PIO ports we allocate for our devices. Later have to be discoverable
> without resorting to probing. On CPU level we do the same with CPUID
> bits instead of relaying on MSRs #GP. On KVM API level we do the same
> with capabilities instead of relying on ioctls returning errors. This
> is not different.
Ok, I see your point now. Yes, this is a good reason why patching is
better in the long run.
Paolo
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