linux-kernel - Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

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Message-ID: <51A33418.40909@redhat.com>
Date:	Mon, 27 May 2013 12:23:20 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	David Gibson <david@...son.dropbear.id.au>
CC:	Scott Wood <scottwood@...escale.com>,
	Alexey Kardashevskiy <aik@...abs.ru>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

Il 25/05/2013 04:45, David Gibson ha scritto:
>> >+	case KVM_CREATE_SPAPR_TCE_IOMMU: {
>> >+		struct kvm_create_spapr_tce_iommu create_tce_iommu;
>> >+		struct kvm *kvm = filp->private_data;
>> >+
>> >+		r = -EFAULT;
>> >+		if (copy_from_user(&create_tce_iommu, argp,
>> >+				sizeof(create_tce_iommu)))
>> >+			goto out;
>> >+		r = kvm_vm_ioctl_create_spapr_tce_iommu(kvm,
>> >&create_tce_iommu);
>> >+		goto out;
>> >+	}

Would it make sense to make this the only interface for creating TCEs?
That is, pass both a window_size and an IOMMU group id (or e.g. -1 for
no hardware IOMMU usage), and have a single ioctl for both cases?
There's some duplicated code between kvm_vm_ioctl_create_spapr_tce and
kvm_vm_ioctl_create_spapr_tce_iommu.

KVM_CREATE_SPAPR_TCE could stay for backwards-compatibility, or you
could just use a new capability and drop the old ioctl.  I'm not sure
whether you're already considering the ABI to be stable for kvmppc.

Paolo
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