Add domain flag DOMAIN_FLAG_VIRTUAL_MACHINE
Add this flag for VT-d used in virtual machine, like KVM.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 104e99d..ffbe4c5 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -206,6 +206,11 @@
/* devices under the same p2p bridge are owned in one domain */
#define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 < 0)
+/* domain represents a virtual machine, more than one devices
+ * across iommus may be owned in one domain, e.g. kvm guest.
+ */
+#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 1)
+
struct dmar_domain {
int id; /* domain id */
unsigned long iommu_bmp; /* bitmap of iommus this domain uses*/
@@ -391,6 +396,8 @@
{
int iommu_id;
+ BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE);
+
iommu_id = find_first_bit(&domain->iommu_bmp, g_num_of_iommus);
if (iommu_id < 0 || iommu_id >= g_num_of_iommus)
return NULL;