iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 006e95d..89d4d47 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -285,11 +285,12 @@
pasid_max = 1 << 20;
mutex_lock(&pasid_mutex);
- if (pasid) {
+ if (pasid && !(flags & SVM_FLAG_PRIVATE_PASID)) {
int i;
idr_for_each_entry(&iommu->pasid_idr, svm, i) {
- if (svm->mm != current->mm)
+ if (svm->mm != current->mm ||
+ (svm->flags & SVM_FLAG_PRIVATE_PASID))
continue;
if (svm->pasid >= pasid_max) {
@@ -355,6 +356,7 @@
svm->pasid = ret;
svm->notifier.ops = &intel_mmuops;
svm->mm = get_task_mm(current);
+ svm->flags = flags;
INIT_LIST_HEAD_RCU(&svm->devs);
ret = -ENOMEM;
if (!svm->mm || (ret = mmu_notifier_register(&svm->notifier, svm->mm))) {