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From: "Ryan C. Underwood" <nemesis@icequake.net>
To: Avi Kivity <avi@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
	Alexander Graf <agraf@suse.de>,
	kvm@vger.kernel.org
Subject: Re: PCI passthrough resource remapping
Date: Thu, 14 Jan 2010 12:31:32 -0600	[thread overview]
Message-ID: <20100114183132.GJ4727@localhost.localdomain> (raw)
In-Reply-To: <4B4F3E4B.5030303@redhat.com>



On Thu, Jan 14, 2010 at 05:54:51PM +0200, Avi Kivity wrote:
> On 01/14/2010 05:47 PM, Michael S. Tsirkin wrote:
> >
> >>Michael, I think 'DisINTx-' means the device is not PCI 2.3 compliant?
> >No it doesn't, just that interrupt disable bit is not set.
> 
> Thanks.  Ryan, while kvm doesn't support assigning a device with
> shared interrupts now, in the future it will likely be possible to
> share it.  You'll still need an iommu.

No IOMMU on this machine and this is all integrated hardware.

This IOMMU requirement seems so strange.  I used to pass through PCI
devices ages ago when using the DOSEMU emulator.  It emulated PCI BIOS
functions and mapped the PCI config space and memory regions into the
emulator process.  The device interrupt was grabbed and handled in the
emulator's kernel support, waking up the emulator when an interrupt came
in.

I don't really know anything about kvm internals, but I'd like to
understand more about the particulars of the IOMMU requirement if you
don't mind.

-- 
Ryan C. Underwood, <nemesis@icequake.net>

  reply	other threads:[~2010-01-14 18:31 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-09  2:45 PCI passthrough resource remapping Ryan C. Underwood
2010-01-09  3:22 ` Alexander Graf
2010-01-10 21:53   ` Ryan C. Underwood
2010-01-10 22:15   ` Ryan C. Underwood
2010-01-14 13:59     ` Avi Kivity
2010-01-14 15:26       ` Ryan C. Underwood
2010-01-14 15:34         ` Avi Kivity
2010-01-14 15:47           ` Michael S. Tsirkin
2010-01-14 15:54             ` Avi Kivity
2010-01-14 18:31               ` Ryan C. Underwood [this message]
2010-01-14 19:09                 ` Avi Kivity
2010-01-14 19:34                   ` Ryan C. Underwood
2010-01-16  9:23                     ` Avi Kivity
2010-01-15 13:11                 ` Pasi Kärkkäinen
2010-01-15 13:15                   ` Alexander Graf
2010-03-26  2:37   ` Kenni Lund
2010-03-26  3:00     ` Brian Jackson
2010-03-29 17:23       ` Kenni Lund
2010-03-29 19:17         ` Alexander Graf
2010-03-29 23:00           ` Kenni Lund
2010-03-29 23:12             ` Alexander Graf
2010-03-29 23:47               ` Chris Wright
2010-03-30  0:21                 ` Kenni Lund
2010-03-30  2:08                   ` Chris Wright
2010-03-30 22:27                     ` Kenni Lund
2010-03-30 22:29                       ` Alexander Graf
2010-03-30 23:52                         ` Kenni Lund
2010-03-31  0:59                           ` Chris Wright
2010-03-30 23:58                       ` Chris Wright
2010-03-31  0:47                         ` Kenni Lund
2010-03-31  1:32                           ` Chris Wright
2010-03-31 10:07                             ` Kenni Lund
2010-03-31 15:15                               ` Chris Wright
2010-03-31 11:43                           ` Kenni Lund
2010-03-31 12:24                             ` Alexander Graf
2010-03-31 13:04                               ` Kenni Lund
2010-03-31 15:18                               ` Chris Wright
2010-03-31 15:23                                 ` Alexander Graf
2010-04-07  5:52                                 ` Avi Kivity

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