Messages in this thread | | | Subject | Re: [PATCH] vfio: Enable VFIO device for powerpc | From | Paolo Bonzini <> | Date | Mon, 7 Sep 2015 13:06:41 +0200 |
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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
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