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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>
This commit is contained in:
Alex Williamson 2013-01-24 15:04:09 -07:00 committed by Gleb Natapov
parent 261874b0d5
commit d47510e295
1 changed files with 3 additions and 1 deletions
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4
virt/kvm/iommu.c
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@ -76,7 +76,9 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
gfn = slot->base_gfn;
end_gfn = gfn + slot->npages;
flags = IOMMU_READ | IOMMU_WRITE;
flags = IOMMU_READ;
if (!(slot->flags & KVM_MEM_READONLY))
flags |= IOMMU_WRITE;
if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
flags |= IOMMU_CACHE;