[PATCH v3] intel_iommu: TM field should not be in reserved bits

[PATCH v3] intel_iommu: TM field should not be in reserved bits

[qi1.zhang]

From: "Zhang, Qi" <qi1.zhang@intel.com>

When dt is supported, TM field should not be Reserved(0).

Refer to VT-d Spec 9.8

Signed-off-by: Zhang, Qi <qi1.zhang@intel.com>
Signed-off-by: Qi, Yadong <yadong.qi@intel.com>
---
 hw/i386/intel_iommu.c          |  8 ++++----
 hw/i386/intel_iommu_internal.h | 17 +++++++++++++----
 2 files changed, 17 insertions(+), 8 deletions(-)
---
Changelog V2:
 move dt_supported flag to VTD_SPTE_PAGE_LX_RSVD_MASK and VTD_SPTE_LPAGE_LX_RSVD_MASK
Changelog V3:
 based on the change to split the arrays into two ones

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index a118efaeaf..69dced4fbd 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3549,15 +3549,15 @@ static void vtd_init(IntelIOMMUState *s)
      * Rsvd field masks for spte
      */
     vtd_spte_rsvd[0] = ~0ULL;
-    vtd_spte_rsvd[1] = VTD_SPTE_PAGE_L1_RSVD_MASK(s->aw_bits);
+    vtd_spte_rsvd[1] = VTD_SPTE_PAGE_L1_RSVD_MASK(s->aw_bits, x86_iommu->dt_supported);
     vtd_spte_rsvd[2] = VTD_SPTE_PAGE_L2_RSVD_MASK(s->aw_bits);
     vtd_spte_rsvd[3] = VTD_SPTE_PAGE_L3_RSVD_MASK(s->aw_bits);
     vtd_spte_rsvd[4] = VTD_SPTE_PAGE_L4_RSVD_MASK(s->aw_bits);
 
     vtd_spte_rsvd_large[0] = ~0ULL;
-    vtd_spte_rsvd_large[1] = VTD_SPTE_LPAGE_L1_RSVD_MASK(s->aw_bits);
-    vtd_spte_rsvd_large[2] = VTD_SPTE_LPAGE_L2_RSVD_MASK(s->aw_bits);
-    vtd_spte_rsvd_large[3] = VTD_SPTE_LPAGE_L3_RSVD_MASK(s->aw_bits);
+    vtd_spte_rsvd_large[1] = VTD_SPTE_LPAGE_L1_RSVD_MASK(s->aw_bits, x86_iommu->dt_supported);
+    vtd_spte_rsvd_large[2] = VTD_SPTE_LPAGE_L2_RSVD_MASK(s->aw_bits, x86_iommu->dt_supported);
+    vtd_spte_rsvd_large[3] = VTD_SPTE_LPAGE_L3_RSVD_MASK(s->aw_bits, x86_iommu->dt_supported);
     vtd_spte_rsvd_large[4] = VTD_SPTE_LPAGE_L4_RSVD_MASK(s->aw_bits);
 
     if (x86_iommu_ir_supported(x86_iommu)) {
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index c1235a7063..3a839a8925 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -387,7 +387,9 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
 
 /* Rsvd field masks for spte */
-#define VTD_SPTE_PAGE_L1_RSVD_MASK(aw) \
+#define VTD_SPTE_PAGE_L1_RSVD_MASK(aw, dt_supported) \
+        dt_supported ? \
+        (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
         (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
 #define VTD_SPTE_PAGE_L2_RSVD_MASK(aw) \
         (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
@@ -395,11 +397,17 @@ typedef union VTDInvDesc VTDInvDesc;
         (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
 #define VTD_SPTE_PAGE_L4_RSVD_MASK(aw) \
         (0x880ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
-#define VTD_SPTE_LPAGE_L1_RSVD_MASK(aw) \
+#define VTD_SPTE_LPAGE_L1_RSVD_MASK(aw, dt_supported) \
+        dt_supported ? \
+        (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
         (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
-#define VTD_SPTE_LPAGE_L2_RSVD_MASK(aw) \
+#define VTD_SPTE_LPAGE_L2_RSVD_MASK(aw, dt_supported) \
+        dt_supported ? \
+        (0x1ff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
         (0x1ff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
-#define VTD_SPTE_LPAGE_L3_RSVD_MASK(aw) \
+#define VTD_SPTE_LPAGE_L3_RSVD_MASK(aw, dt_supported) \
+        dt_supported ? \
+        (0x3ffff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
         (0x3ffff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
 #define VTD_SPTE_LPAGE_L4_RSVD_MASK(aw) \
         (0x880ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
@@ -506,5 +514,6 @@ typedef struct VTDRootEntry VTDRootEntry;
 #define VTD_SL_W                    (1ULL << 1)
 #define VTD_SL_PT_BASE_ADDR_MASK(aw) (~(VTD_PAGE_SIZE - 1) & VTD_HAW_MASK(aw))
 #define VTD_SL_IGN_COM              0xbff0000000000000ULL
+#define VTD_SL_TM                   (1ULL << 62)
 
 #endif
-- 
2.20.1