linux-kernel - Re: [PATCH] vfio: Enable VFIO device for powerpc

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Date:	Wed, 26 Aug 2015 11:34:26 +0200
From:	Alexander Graf <agraf@...e.de>
To:	David Gibson <david@...son.dropbear.id.au>,
	alex.williamson@...hat.com, pbonzini@...hat.com
Cc:	paulus@...ba.org, aik@...abs.ru, mdroth@...ux.vnet.ibm.com,
	benh@...nel.crashing.org, mpe@...erman.id.au, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	kvm-ppc <kvm-ppc@...r.kernel.org>
Subject: Re: [PATCH] vfio: Enable VFIO device for powerpc



On 13.08.15 03:15, David Gibson wrote:
> ec53500f "kvm: Add VFIO device" added a special KVM pseudo-device which is
> used to handle any necessary interactions between KVM and VFIO.
> 
> Currently that device is built on x86 and ARM, but not powerpc, although
> powerpc does support both KVM and VFIO.  This makes things awkward in
> userspace
> 
> Currently qemu prints an alarming error message if you attempt to use VFIO
> and it can't initialize the KVM VFIO device.  We don't want to remove the
> warning, because lack of the KVM VFIO device could mean coherency problems
> on x86.  On powerpc, however, the error is harmless but looks disturbing,
> and a test based on host architecture in qemu would be ugly, and break if
> we do need the KVM VFIO device for something important in future.
> 
> There's nothing preventing the KVM VFIO device from being built for
> powerpc, so this patch turns it on.  It won't actually do anything, since
> we don't define any of the arch_*() hooks, but it will make qemu happy and
> we can extend it in future if we need to.
> 
> Signed-off-by: David Gibson <david@...son.dropbear.id.au>
> Reviewed-by: Eric Auger <eric.auger@...aro.org>

Paul is going to take care of the kvm-ppc tree for 4.3. Also, ppc kvm
patches should get CC on the kvm-ppc@...r mailing list ;).

Paul, could you please pick this one up?


Thanks!

Alex
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