linux-kernel - Re: [kvm-devel] [RFC] Deferred interrupt handling.

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Message-ID: <20070718191433.GB24545@csclub.uwaterloo.ca>
Date:	Wed, 18 Jul 2007 15:14:33 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Avi Kivity <avi@...ranet.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dor Laor <dor.laor@...ranet.com>,
	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [RFC] Deferred interrupt handling.

On Wed, Jul 18, 2007 at 07:46:13PM +0300, Avi Kivity wrote:
> IMO the only reasonable solution is to disallow interrupt forwarding
> with shared irqs.  If someone later comes up with a bright idea, we can
> implement it.  Otherwise the problem will solve itself with hardware
> moving to msi.

Disallowing shared IRQs means disallowing PCI devices in general, so now
you are back to ISA only devices, which it sounds like were the only
things already allowed by vm86 or whatever it was for passing through.

MSI would be good, but how long until all devices support that?
Certainly does appear to have potential though for allowing more
interesting virtual machines.

--
Len Sorensen
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