path: root/virt/kvm/iommu.c
diff options
authorAlex Williamson <alex.williamson@redhat.com>2013-10-30 11:02:30 -0600
committerPaolo Bonzini <pbonzini@redhat.com>2013-10-30 19:02:23 +0100
commite0f0bbc527f6e9c0261f1d16b2a0b47612b7f235 (patch)
tree623b954e7571767c4d5f0581ad8ba6eacd48785d /virt/kvm/iommu.c
parentd96eb2c6f480769bff32054e78b964860dae4d56 (diff)
kvm: Create non-coherent DMA registeration
We currently use some ad-hoc arch variables tied to legacy KVM device assignment to manage emulation of instructions that depend on whether non-coherent DMA is present. Create an interface for this, adapting legacy KVM device assignment and adding VFIO via the KVM-VFIO device. For now we assume that non-coherent DMA is possible any time we have a VFIO group. Eventually an interface can be developed as part of the VFIO external user interface to query the coherency of a group. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/iommu.c')
1 files changed, 6 insertions, 0 deletions
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index d32d156a423a..c7d9ce122529 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -140,6 +140,9 @@ static int kvm_iommu_map_memslots(struct kvm *kvm)
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
+ if (kvm->arch.iommu_noncoherent)
+ kvm_arch_register_noncoherent_dma(kvm);
idx = srcu_read_lock(&kvm->srcu);
slots = kvm_memslots(kvm);
@@ -327,6 +330,9 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm)
srcu_read_unlock(&kvm->srcu, idx);
+ if (kvm->arch.iommu_noncoherent)
+ kvm_arch_unregister_noncoherent_dma(kvm);
return 0;

Privacy Policy