aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorWeidong Han <weidong.han@intel.com>2008-12-08 16:35:39 +0800
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:02:18 +0100
commit1ce28feb22833645a0f3843cd873a0b56ed19ef0 (patch)
treed5196526bdcff639a40262b29f45f06019f02b45 /drivers
parent8e604097ddc483eb1e6e99564953e4e937fe439a (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/intel-iommu.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 104e99df2ad..ffbe4c57372 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -206,6 +206,11 @@ static inline bool dma_pte_present(struct dma_pte *pte)
/* 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 @@ static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
{
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;