From: Alex Williamson <alex.william...@redhat.com>
-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
If you see a problem with using this for longterm, please comment.
-------------------
commit 423873736b78f549fbfa2f715f2e4de7e6c5e1e9 upstream.
This option has no users and it exposes a security hole that we
can allow devices to be assigned without iommu protection. Make
KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory option.
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
[PG: drop Documentation chunk; no api.txt file in .34 baseline]
Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
---
virt/kvm/assigned-dev.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 02ff2b1..1f97473 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -509,6 +509,9 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *match;
struct pci_dev *dev;
+ if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
+ return -EINVAL;
+
mutex_lock(&kvm->lock);
idx = srcu_read_lock(&kvm->srcu);
@@ -564,16 +567,14 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
list_add(&match->list, &kvm->arch.assigned_dev_head);
- if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
- if (!kvm->arch.iommu_domain) {
- r = kvm_iommu_map_guest(kvm);
- if (r)
- goto out_list_del;
- }
- r = kvm_assign_device(kvm, match);
+ if (!kvm->arch.iommu_domain) {
+ r = kvm_iommu_map_guest(kvm);
if (r)
goto out_list_del;
}
+ r = kvm_assign_device(kvm, match);
+ if (r)
+ goto out_list_del;
out:
srcu_read_unlock(&kvm->srcu, idx);
@@ -610,8 +611,7 @@ static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
goto out;
}
- if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
- kvm_deassign_device(kvm, match);
+ kvm_deassign_device(kvm, match);
kvm_free_assigned_device(kvm, match);
--
1.7.12.rc2
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