linux-kernel - Re: [PATCH v13 0/8] pv event interface between host and guest

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Date:	Mon, 4 Mar 2013 12:59:28 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Paolo Bonzini <pbonzini@...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>,
	Kevin Wolf <kwolf@...hat.com>,
	Wen Congyang <wency@...fujitsu.com>,
	"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

On Mon, Mar 04, 2013 at 11:49:07AM +0100, Paolo Bonzini wrote:
> Il 04/03/2013 11:43, Gleb Natapov ha scritto:
> > > Anyhow, this does not apply to the next submission of this series.  I
> > > think we can agree to the compromise of using ACPI but still read the
> > > port in _STA.
> > 
> > If you want to make ioport configurable I do not see how can we avoid
> > patching.
> 
> I want to make the ioport configurable in the device, but the PIIX and
> ICH9 (which are what the DSDT is written for) will always use port 0x505.
> 
But the device is not part of PIIX or ICH9. It is additional device that
may or may not be present depending on a command line. So what if
someone configures debugcon or debugexit to use this port? We can always
blame the users, but I fill that we are making unnecessary compromises.

> You can configure a different iobase for your serial ports, the guest
> can still use them but not discover them via ACPI.  This is the same thing.
> 
Probably we should patch DSDT too when it will be in QEMU :) of force
iobase to spec values if device is used as part of a chipset.

--
			Gleb.
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