[PATCH rfcv1 18/23] intel_iommu: fix the fault reason report

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

From: Yu Zhang <yu.c.zhang@linux.intel.com>

Currently we use only VTD_FR_PASID_TABLE_INV as
fault reaon. Fix this with correct fault reasons
listed in VT-d spec 7.2.3.

Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_internal.h |  8 ++++++-
 hw/i386/intel_iommu.c          | 42 +++++++++++++++++++++-------------
 2 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 41b958cd5d..21fa767740 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -325,8 +325,14 @@ typedef enum VTDFaultReason {
                                   * request while disabled */
     VTD_FR_IR_SID_ERR = 0x26,   /* Invalid Source-ID */
 
-    VTD_FR_PASID_TABLE_INV = 0x58,  /*Invalid PASID table entry */
+    VTD_FR_RTADDR_INV_TTM = 0x31,  /* Invalid TTM in RTADDR */
+    /* PASID directory entry access failure */
+    VTD_FR_PASID_DIR_ACCESS_ERR = 0x50,
+    /* The Present(P) field of pasid directory entry is 0 */
+    VTD_FR_PASID_DIR_ENTRY_P = 0x51,
+    VTD_FR_PASID_TABLE_ACCESS_ERR = 0x58, /* PASID table entry access failure */
     VTD_FR_PASID_ENTRY_P = 0x59, /* The Present(P) field of pasidt-entry is 0 */
+    VTD_FR_PASID_TABLE_ENTRY_INV = 0x5b,  /*Invalid PASID table entry */
 
     /* Output address in the interrupt address range for scalable mode */
     VTD_FR_SM_INTERRUPT_ADDR = 0x87,
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 1c21f40ccd..1e87383a41 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -819,7 +819,7 @@ static int vtd_get_pdire_from_pdir_table(dma_addr_t pasid_dir_base,
     addr = pasid_dir_base + index * entry_size;
     if (dma_memory_read(&address_space_memory, addr,
                         pdire, entry_size, MEMTXATTRS_UNSPECIFIED)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_DIR_ACCESS_ERR;
     }
 
     pdire->val = le64_to_cpu(pdire->val);
@@ -832,6 +832,11 @@ static inline bool vtd_pe_present(VTDPASIDEntry *pe)
     return pe->val[0] & VTD_PASID_ENTRY_P;
 }
 
+static inline uint32_t vtd_pe_get_flpt_level(VTDPASIDEntry *pe)
+{
+    return 4 + ((pe->val[2] >> 2) & VTD_SM_PASID_ENTRY_FLPM);
+}
+
 static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUState *s,
                                           uint32_t pasid,
                                           dma_addr_t addr,
@@ -840,13 +845,14 @@ static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUState *s,
     uint32_t index;
     dma_addr_t entry_size;
     X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
+    uint8_t pgtt;
 
     index = VTD_PASID_TABLE_INDEX(pasid);
     entry_size = VTD_PASID_ENTRY_SIZE;
     addr = addr + index * entry_size;
     if (dma_memory_read(&address_space_memory, addr,
                         pe, entry_size, MEMTXATTRS_UNSPECIFIED)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_TABLE_ACCESS_ERR;
     }
     for (size_t i = 0; i < ARRAY_SIZE(pe->val); i++) {
         pe->val[i] = le64_to_cpu(pe->val[i]);
@@ -854,12 +860,17 @@ static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUState *s,
 
     /* Do translation type check */
     if (!vtd_pe_type_check(x86_iommu, pe)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_TABLE_ENTRY_INV;
     }
 
-    if (!vtd_is_level_supported(s, VTD_PE_GET_LEVEL(pe))) {
-        return -VTD_FR_PASID_TABLE_INV;
-    }
+    pgtt = VTD_PE_GET_TYPE(pe);
+    if (pgtt == VTD_SM_PASID_ENTRY_SLT &&
+        !vtd_is_level_supported(s, VTD_PE_GET_LEVEL(pe)))
+            return -VTD_FR_PASID_TABLE_ENTRY_INV;
+
+    if (pgtt == VTD_SM_PASID_ENTRY_FLT &&
+        vtd_pe_get_flpt_level(pe) != 4)
+            return -VTD_FR_PASID_TABLE_ENTRY_INV;
 
     return 0;
 }
@@ -899,7 +910,7 @@ static int vtd_get_pe_from_pasid_table(IntelIOMMUState *s,
     }
 
     if (!vtd_pdire_present(&pdire)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_DIR_ENTRY_P;
     }
 
     ret = vtd_get_pe_from_pdire(s, pasid, &pdire, pe);
@@ -908,7 +919,7 @@ static int vtd_get_pe_from_pasid_table(IntelIOMMUState *s,
     }
 
     if (!vtd_pe_present(pe)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_ENTRY_P;
     }
 
     return 0;
@@ -961,7 +972,7 @@ static int vtd_ce_get_pasid_fpd(IntelIOMMUState *s,
     }
 
     if (!vtd_pdire_present(&pdire)) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_PASID_DIR_ENTRY_P;
     }
 
     /*
@@ -1829,7 +1840,11 @@ static const bool vtd_qualified_faults[] = {
     [VTD_FR_ROOT_ENTRY_RSVD] = false,
     [VTD_FR_PAGING_ENTRY_RSVD] = true,
     [VTD_FR_CONTEXT_ENTRY_TT] = true,
-    [VTD_FR_PASID_TABLE_INV] = false,
+    [VTD_FR_PASID_DIR_ACCESS_ERR] = false,
+    [VTD_FR_PASID_DIR_ENTRY_P] = true,
+    [VTD_FR_PASID_TABLE_ACCESS_ERR] = false,
+    [VTD_FR_PASID_ENTRY_P] = true,
+    [VTD_FR_PASID_TABLE_ENTRY_INV] = true,
     [VTD_FR_SM_INTERRUPT_ADDR] = true,
     [VTD_FR_MAX] = false,
 };
@@ -1904,11 +1919,6 @@ static inline uint64_t vtd_flpt_level_page_mask(uint32_t level)
     return ~((1ULL << vtd_flpt_level_shift(level)) - 1);
 }
 
-static inline dma_addr_t vtd_pe_get_flpt_level(VTDPASIDEntry *pe)
-{
-    return 4 + ((pe->val[2] >> 2) & VTD_SM_PASID_ENTRY_FLPM);
-}
-
 /*
  * Given an iova and the level of paging structure, return the offset
  * of current level.
@@ -3499,7 +3509,7 @@ static inline int vtd_dev_get_pe_from_pasid(IntelIOMMUState *s,
     dma_addr_t pasid_dir_base;
 
     if (!s->root_scalable) {
-        return -VTD_FR_PASID_TABLE_INV;
+        return -VTD_FR_RTADDR_INV_TTM;
     }
 
     ret = vtd_dev_to_context_entry(s, bus_num, devfn, &ce);
-- 
2.34.1