[PATCH v2 4/5] iommu/vtd: cleanup MAP_SINGLE_DEVICE and related code

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

From: Teddy Astie <teddy.astie@xxxxxxxxxx>

This flag was only used in case cx16 is not available, as those code paths no
longer exist, this flag now does basically nothing.

Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c | 12 +++---------
 xen/drivers/passthrough/vtd/vtd.h   |  5 ++---
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index b0963bfcf74e..9d7a9977a6a6 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1695,15 +1695,9 @@ static int domain_context_mapping(struct domain *domain, 
u8 devfn,
         break;
     }
 
-    if ( domain != pdev->domain && pdev->domain != dom_io )
-    {
-        if ( pdev->domain->is_dying )
-            mode |= MAP_OWNER_DYING;
-        else if ( drhd &&
-                  !any_pdev_behind_iommu(pdev->domain, pdev, drhd->iommu) &&
-                  !pdev->phantom_stride )
-            mode |= MAP_SINGLE_DEVICE;
-    }
+    if ( domain != pdev->domain && pdev->domain != dom_io &&
+         pdev->domain->is_dying )
+        mode |= MAP_OWNER_DYING;
 
     switch ( pdev->type )
     {
diff --git a/xen/drivers/passthrough/vtd/vtd.h 
b/xen/drivers/passthrough/vtd/vtd.h
index 8aeff8c1f287..b95124517bd3 100644
--- a/xen/drivers/passthrough/vtd/vtd.h
+++ b/xen/drivers/passthrough/vtd/vtd.h
@@ -28,9 +28,8 @@
  */
 #define MAP_WITH_RMRR         (1u << 0)
 #define MAP_OWNER_DYING       (1u << 1)
-#define MAP_SINGLE_DEVICE     (1u << 2)
-#define MAP_ERROR_RECOVERY    (1u << 3)
-#define UNMAP_ME_PHANTOM_FUNC (1u << 4)
+#define MAP_ERROR_RECOVERY    (1u << 2)
+#define UNMAP_ME_PHANTOM_FUNC (1u << 3)
 
 /* Allow for both IOAPIC and IOSAPIC. */
 #define IO_xAPIC_route_entry IO_APIC_route_entry
-- 
2.46.0