From: Avi Kivity <avi@qumranet.com>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Dor Laor <dor.laor@qumranet.com>,
kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [kvm-devel] [RFC] Deferred interrupt handling.
Date: Thu, 19 Jul 2007 12:23:24 +0300 [thread overview]
Message-ID: <469F2D8C.7020805@qumranet.com> (raw)
In-Reply-To: <20070718191433.GB24545@csclub.uwaterloo.ca>
Lennart Sorensen wrote:
> 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.
>
>
No, it means disallowing pci devices that use shared irqs, and allowing
pci devices that use non-shared irqs.
> Certainly does appear to have potential though for allowing more
> interesting virtual machines.
>
IMO pass-through is counter to most of the benefits of virtualization.
But users seem to want it.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Lennart Sorensen
<lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC] Deferred interrupt handling.
Date: Thu, 19 Jul 2007 12:23:24 +0300 [thread overview]
Message-ID: <469F2D8C.7020805@qumranet.com> (raw)
In-Reply-To: <20070718191433.GB24545-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys@public.gmane.org>
Lennart Sorensen wrote:
> 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.
>
>
No, it means disallowing pci devices that use shared irqs, and allowing
pci devices that use non-shared irqs.
> Certainly does appear to have potential though for allowing more
> interesting virtual machines.
>
IMO pass-through is counter to most of the benefits of virtualization.
But users seem to want it.
--
error compiling committee.c: too many arguments to function
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next prev parent reply other threads:[~2007-07-19 9:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-18 9:53 [RFC] Deferred interrupt handling Or Sagi
2007-07-18 9:53 ` Or Sagi
2007-07-18 11:30 ` Alan Cox
2007-07-18 11:30 ` Alan Cox
2007-07-18 16:36 ` [kvm-devel] " Dor Laor
2007-07-18 16:36 ` Dor Laor
2007-07-18 16:47 ` [kvm-devel] " Alan Cox
2007-07-18 16:47 ` Alan Cox
2007-07-18 16:46 ` [kvm-devel] " Avi Kivity
2007-07-18 16:46 ` Avi Kivity
2007-07-18 16:57 ` [kvm-devel] " Alan Cox
2007-07-18 16:57 ` Alan Cox
2007-07-18 16:57 ` [kvm-devel] " Avi Kivity
2007-07-18 16:57 ` Avi Kivity
2007-07-18 17:14 ` [kvm-devel] " Alan Cox
2007-07-18 17:14 ` Alan Cox
2007-07-18 17:09 ` [kvm-devel] " Dor Laor
2007-07-18 17:09 ` Dor Laor
2007-07-18 17:33 ` [kvm-devel] " Alan Cox
2007-07-18 17:33 ` Alan Cox
2007-07-18 21:29 ` [kvm-devel] " Dor Laor
2007-07-18 21:29 ` Dor Laor
2007-07-18 21:46 ` [kvm-devel] " Alan Cox
2007-07-18 21:46 ` Alan Cox
2007-07-25 14:18 ` [kvm-devel] " Pavel Machek
2007-07-25 14:18 ` Pavel Machek
2007-07-18 22:23 ` [kvm-devel] " Or Sagi
2007-07-18 22:23 ` Or Sagi
2007-07-18 19:14 ` [kvm-devel] " Lennart Sorensen
2007-07-18 19:14 ` Lennart Sorensen
2007-07-19 9:23 ` Avi Kivity [this message]
2007-07-19 9:23 ` Avi Kivity
2007-07-19 13:17 ` [kvm-devel] " Lennart Sorensen
2007-07-19 13:17 ` Lennart Sorensen
2007-07-19 13:38 ` [kvm-devel] " Avi Kivity
2007-07-19 13:38 ` Avi Kivity
2007-07-19 16:23 ` [kvm-devel] " Lennart Sorensen
2007-07-19 16:23 ` Lennart Sorensen
2007-07-18 15:57 ` Lennart Sorensen
2007-07-18 15:57 ` Lennart Sorensen
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