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kvm: Obey read-only mappings in iommu
We've been ignoring read-only mappings and programming everything into the iommu as read-write. Fix this to only include the write access flag when read-only is not set. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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@ -76,7 +76,9 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
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gfn = slot->base_gfn;
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end_gfn = gfn + slot->npages;
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flags = IOMMU_READ | IOMMU_WRITE;
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flags = IOMMU_READ;
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if (!(slot->flags & KVM_MEM_READONLY))
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flags |= IOMMU_WRITE;
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if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
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flags |= IOMMU_CACHE;
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