[PATCH rfcv2 08/17] intel_iommu: set accessed and dirty bits during first stage translation

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

From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>

Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_internal.h |  3 +++
 hw/i386/intel_iommu.c          | 25 +++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index b6820dbca3..c0a94af820 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -327,6 +327,7 @@ typedef enum VTDFaultReason {
 
     /* Output address in the interrupt address range for scalable mode */
     VTD_FR_SM_INTERRUPT_ADDR = 0x87,
+    VTD_FR_FS_BIT_UPDATE_FAILED = 0x91, /* SFS.10 */
     VTD_FR_MAX,                 /* Guard */
 } VTDFaultReason;
 
@@ -547,6 +548,8 @@ typedef struct VTDRootEntry VTDRootEntry;
 /* First Level Paging Structure */
 #define VTD_FL_PT_LEVEL             1
 #define VTD_FL_PT_ENTRY_NR          512
+#define VTD_FL_PTE_A                0x20
+#define VTD_FL_PTE_D                0x40
 
 /* Masks for First Level Paging Entry */
 #define VTD_FL_RW_MASK              (1ULL << 1)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 1ea030bfbe..0801112e2e 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1802,6 +1802,7 @@ static const bool vtd_qualified_faults[] = {
     [VTD_FR_PASID_TABLE_ENTRY_INV] = true,
     [VTD_FR_SM_INTERRUPT_ADDR] = true,
     [VTD_FR_FS_NON_CANONICAL] = true,
+    [VTD_FR_FS_BIT_UPDATE_FAILED] = true,
     [VTD_FR_MAX] = false,
 };
 
@@ -1927,6 +1928,20 @@ static bool vtd_iova_fl_check_canonical(IntelIOMMUState *s, uint64_t iova,
             );
 }
 
+static MemTxResult vtd_set_flag_in_pte(dma_addr_t base_addr, uint32_t index,
+                                       uint64_t pte, uint64_t flag)
+{
+    if (pte & flag) {
+        return MEMTX_OK;
+    }
+    pte |= flag;
+    pte = cpu_to_le64(pte);
+    return dma_memory_write(&address_space_memory,
+                            base_addr + index * sizeof(pte),
+                            &pte, sizeof(pte),
+                            MEMTXATTRS_UNSPECIFIED);
+}
+
 /*
  * Given the @iova, get relevant @flptep. @flpte_level will be the last level
  * of the translation, can be used for deciding the size of large page.
@@ -1972,7 +1987,17 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, VTDContextEntry *ce,
             return -VTD_FR_WRITE;
         }
 
+        if (vtd_set_flag_in_pte(addr, offset, flpte, VTD_FL_PTE_A)
+                                                                != MEMTX_OK) {
+            return -VTD_FR_FS_BIT_UPDATE_FAILED;
+        }
+
         if (vtd_is_last_flpte(flpte, level)) {
+            if (is_write &&
+                (vtd_set_flag_in_pte(addr, offset, flpte, VTD_FL_PTE_D) !=
+                                                                    MEMTX_OK)) {
+                    return -VTD_FR_FS_BIT_UPDATE_FAILED;
+            }
             *flptep = flpte;
             *flpte_level = level;
             return 0;
-- 
2.34.1