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

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Message-ID: <469F6941.9010901@qumranet.com>
Date:	Thu, 19 Jul 2007 16:38:09 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
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.

Lennart Sorensen wrote:
> On Thu, Jul 19, 2007 at 12:23:24PM +0300, Avi Kivity wrote:
>   
>> No, it means disallowing pci devices that use shared irqs, and allowing 
>> pci devices that use non-shared irqs.
>>     
>
> Most machiens I see today have almost no chance of having PCI devices
> without shared IRQs.  This probably means any implementation will only
> work on a small set of machines with very specific setup in terms of
> which PCI slots they install cards in, and only as long as you don't
> allow any type of hotplugging of devices (or ever changing hardware at
> all).  May not be worth implementing if it has such a limited use case.
> The MSI setup on the other hand does sound like it might have potential
> for working in general.
>
>   

Looking at two random servers here and a desktop, interrupts are 
unshared except for usb.  A laptop was not so lucky.  So "no chance" is 
a bit extreme.

I agree it's far from optimal, but it is less limited than you imply.


-- 
error compiling committee.c: too many arguments to function

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