Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1220058

Re: [PATCH] vfio: Enable VFIO device for powerpc

Show all headers | View raw

On 26/08/2015 20:54, Paul Mackerras wrote:
> On Wed, Aug 26, 2015 at 11:34:26AM +0200, Alexander Graf wrote:
>>
>>
>> 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@gibson.dropbear.id.au>
>>> Reviewed-by: Eric Auger <eric.auger@linaro.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@vger mailing list ;).
>>
>> Paul, could you please pick this one up?
> 
> Sure, I'll do that once I get home (end of this week).

This was not in the 4.3 pull request, but I think we can apply it after
the end of the merge window.

Paolo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH] vfio: Enable VFIO device for powerpc Alexander Graf <agraf@suse.de> - 2015-08-26 11:40 +0200
  Re: [PATCH] vfio: Enable VFIO device for powerpc Paul Mackerras <paulus@ozlabs.org> - 2015-08-26 21:00 +0200
    Re: [PATCH] vfio: Enable VFIO device for powerpc Paolo Bonzini <pbonzini@redhat.com> - 2015-09-07 13:10 +0200

csiph-web