From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: kvm-ppc-devel@lists.sourceforge.net,
kvm-devel <kvm-devel@lists.sourceforge.net>,
Rusty Russell <rusty@ozlabs.au.ibm.com>,
Hollis Blanchard <hollisb@us.ibm.com>
Subject: Re: [kvm-ppc-devel] booting from virtio-blk
Date: Tue, 01 Apr 2008 21:14:45 +0000 [thread overview]
Message-ID: <1207084485.10388.228.camel@pasglop> (raw)
In-Reply-To: <47F2A30F.3050508@us.ibm.com>
> > Config space should be 8/16/32. Is that ever bridged to real PCI config
> > space anyway ? Or only virtio ? And it should be endian swapped at the
> > low level, either by your HV calls or by the low level kernel. Always.
> > That's how PCI config space is supposed to work.
> >
>
> I guess the point is, is that virtio config space is an abstraction with
> the implementation that is based on PCI converting all accesses to a
> series of 8-bit accesses. The virtio config space happens to be little
> endian just like the PCI config space.
But PCI does -not- convert all accesses into a serie of 8 bit
accesses :-)
Ben.
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WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: kvm-ppc-devel@lists.sourceforge.net,
kvm-devel <kvm-devel@lists.sourceforge.net>,
Rusty Russell <rusty@ozlabs.au.ibm.com>,
Hollis Blanchard <hollisb@us.ibm.com>
Subject: Re: [kvm-ppc-devel] booting from virtio-blk
Date: Wed, 02 Apr 2008 08:14:45 +1100 [thread overview]
Message-ID: <1207084485.10388.228.camel@pasglop> (raw)
In-Reply-To: <47F2A30F.3050508@us.ibm.com>
> > Config space should be 8/16/32. Is that ever bridged to real PCI config
> > space anyway ? Or only virtio ? And it should be endian swapped at the
> > low level, either by your HV calls or by the low level kernel. Always.
> > That's how PCI config space is supposed to work.
> >
>
> I guess the point is, is that virtio config space is an abstraction with
> the implementation that is based on PCI converting all accesses to a
> series of 8-bit accesses. The virtio config space happens to be little
> endian just like the PCI config space.
But PCI does -not- convert all accesses into a serie of 8 bit
accesses :-)
Ben.
-------------------------------------------------------------------------
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It's the best place to buy or sell services for
just about anything Open Source.
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next prev parent reply other threads:[~2008-04-01 21:14 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-01 12:01 [kvm-ppc-devel] [PATCH] kvm(ppc)-userspace: initialize virtio-block ehrhardt
2008-04-01 12:08 ` [kvm-ppc-devel] [PATCH] kvm(ppc)-userspace: initialize Christian Ehrhardt
2008-04-01 14:33 ` [kvm-ppc-devel] [PATCH] kvm(ppc)-userspace: Hollis Blanchard
2008-04-01 14:46 ` [kvm-ppc-devel] [PATCH] kvm(ppc)-userspace: initialize Anthony Liguori
2008-04-01 16:13 ` [kvm-ppc-devel] booting from virtio-blk Hollis Blanchard
2008-04-01 16:13 ` Hollis Blanchard
2008-04-01 17:05 ` [kvm-ppc-devel] " Anthony Liguori
2008-04-01 17:05 ` Anthony Liguori
2008-04-01 17:09 ` [kvm-ppc-devel] " Anthony Liguori
2008-04-01 17:09 ` Anthony Liguori
2008-04-01 20:36 ` [kvm-ppc-devel] " Benjamin Herrenschmidt
2008-04-01 20:36 ` Benjamin Herrenschmidt
2008-04-01 21:03 ` Anthony Liguori
2008-04-01 21:03 ` Anthony Liguori
2008-04-01 21:14 ` Benjamin Herrenschmidt [this message]
2008-04-01 21:14 ` Benjamin Herrenschmidt
2008-04-01 21:18 ` Hollis Blanchard
2008-04-01 21:18 ` Hollis Blanchard
2008-04-01 21:24 ` Benjamin Herrenschmidt
2008-04-01 21:24 ` Benjamin Herrenschmidt
2008-04-02 14:52 ` [kvm-ppc-devel] [PATCH] kvm(ppc)-userspace: initialize Anthony Liguori
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