[v7][RFC][PATCH 11/13] xen:vtd: create RMRR mapping

[Tiejun Chen <tiejun.chen@intel.com>]

intel_iommu_map_page() does nothing if VT-d shares EPT page table.
So rmrr_identity_mapping() never create RMRR mapping but in some
cases like some GFX drivers it still need to access RMRR.

Here we will create those RMRR mappings even in shared EPT case.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 xen/drivers/passthrough/vtd/iommu.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index efd3390..07136df 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1856,10 +1856,15 @@ static int rmrr_identity_mapping(struct domain *d, bool_t map,
 
     while ( base_pfn < end_pfn )
     {
-        int err = intel_iommu_map_page(d, base_pfn, base_pfn,
-                                       IOMMUF_readable|IOMMUF_writable);
-
-        if ( err )
+        int err = 0;
+        if ( iommu_use_hap_pt(d) )
+        {
+            ASSERT(!iommu_passthrough || !is_hardware_domain(d));
+            if ( (err = set_identity_p2m_entry(d, base_pfn, p2m_access_rw)) )
+                return err;
+        }
+        else if ( (err = intel_iommu_map_page(d, base_pfn, base_pfn,
+					      IOMMUF_readable|IOMMUF_writable)) )
             return err;
         base_pfn++;
     }
-- 
1.9.1