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KVM: Remove ability to assign a device without iommu support 

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.williamson@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Alex Williamson 2011-12-20 21:59:03 -07:00 committed by Avi Kivity
parent 0924ab2cfa
commit 423873736b
2 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/virtual/kvm/api.txt
View File

@ -1151,6 +1151,9 @@ following flags are specified:
/* Depends on KVM_CAP_IOMMU */
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
The KVM_DEV_ASSIGN_ENABLE_IOMMU flag is a mandatory option to ensure
isolation of the device. Usages not specifying this flag are deprecated.
4.49 KVM_DEASSIGN_PCI_DEVICE
Capability: KVM_CAP_DEVICE_DEASSIGNMENT

18
virt/kvm/assigned-dev.c
View File

@ -487,6 +487,9 @@ 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);
@ -544,16 +547,14 @@ 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);
@ -593,8 +594,7 @@ 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);