[PATCH] intel_iommu: Remove Transient Mapping (TM) field from second-level page-tables

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

VT-d spec removed Transient Mapping (TM) field from second-level page-tables
and treat the field as Reserved(0) since revision 3.2. Update code to match
spec.

This doesn't impact function of vIOMMU as there was no logic to emulate
Transient Mapping.

Suggested-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_internal.h | 13 +++----------
 hw/i386/intel_iommu.c          | 11 +++--------
 2 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 13d5d129ae..c818c819fe 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -412,9 +412,7 @@ typedef union VTDInvDesc VTDInvDesc;
 /* Rsvd field masks for spte */
 #define VTD_SPTE_SNP 0x800ULL
 
-#define VTD_SPTE_PAGE_L1_RSVD_MASK(aw, dt_supported) \
-        dt_supported ? \
-        (0x800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
+#define VTD_SPTE_PAGE_L1_RSVD_MASK(aw) \
         (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))
@@ -423,13 +421,9 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_SPTE_PAGE_L4_RSVD_MASK(aw) \
         (0x880ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
 
-#define VTD_SPTE_LPAGE_L2_RSVD_MASK(aw, dt_supported) \
-        dt_supported ? \
-        (0x1ff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
+#define VTD_SPTE_LPAGE_L2_RSVD_MASK(aw) \
         (0x1ff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
-#define VTD_SPTE_LPAGE_L3_RSVD_MASK(aw, dt_supported) \
-        dt_supported ? \
-        (0x3ffff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM | VTD_SL_TM)) : \
+#define VTD_SPTE_LPAGE_L3_RSVD_MASK(aw) \
         (0x3ffff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM))
 
 /* Information about page-selective IOTLB invalidate */
@@ -536,6 +530,5 @@ 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
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 08fe218935..eb5aa2b2d5 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4111,8 +4111,6 @@ static void vtd_cap_init(IntelIOMMUState *s)
  */
 static void vtd_init(IntelIOMMUState *s)
 {
-    X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
-
     memset(s->csr, 0, DMAR_REG_SIZE);
     memset(s->wmask, 0, DMAR_REG_SIZE);
     memset(s->w1cmask, 0, DMAR_REG_SIZE);
@@ -4137,16 +4135,13 @@ 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,
-                                                  x86_iommu->dt_supported);
+    vtd_spte_rsvd[1] = VTD_SPTE_PAGE_L1_RSVD_MASK(s->aw_bits);
     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[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[2] = VTD_SPTE_LPAGE_L2_RSVD_MASK(s->aw_bits);
+    vtd_spte_rsvd_large[3] = VTD_SPTE_LPAGE_L3_RSVD_MASK(s->aw_bits);
 
     if (s->scalable_mode || s->snoop_control) {
         vtd_spte_rsvd[1] &= ~VTD_SPTE_SNP;
-- 
2.34.1