[PATCH ats_vtd v5 03/22] intel_iommu: return page walk level even when the translation fails

[CLEMENT MATHIEU--DRIF]

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

We use this information in vtd_do_iommu_translate to populate the
IOMMUTLBEntry and indicate the correct page mask. This prevents ATS
devices from sending many useless translation requests when a megapage
or gigapage iova is not mapped to a physical address.

Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
---
 hw/i386/intel_iommu.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index c6474ae735..98996ededc 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2096,9 +2096,9 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, 
VTDContextEntry *ce,
                              uint32_t pasid)
 {
     dma_addr_t addr = vtd_get_iova_pgtbl_base(s, ce, pasid);
-    uint32_t level = vtd_get_iova_level(s, ce, pasid);
     uint32_t offset;
     uint64_t flpte;
+    *flpte_level = vtd_get_iova_level(s, ce, pasid);
 
     if (!vtd_iova_fl_check_canonical(s, iova, ce, pasid)) {
         error_report_once("%s: detected non canonical IOVA (iova=0x%" PRIx64 
","
@@ -2107,11 +2107,11 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, 
VTDContextEntry *ce,
     }
 
     while (true) {
-        offset = vtd_iova_level_offset(iova, level);
+        offset = vtd_iova_level_offset(iova, *flpte_level);
         flpte = vtd_get_pte(addr, offset);
 
         if (flpte == (uint64_t)-1) {
-            if (level == vtd_get_iova_level(s, ce, pasid)) {
+            if (*flpte_level == vtd_get_iova_level(s, ce, pasid)) {
                 /* Invalid programming of context-entry */
                 return -VTD_FR_CONTEXT_ENTRY_INV;
             } else {
@@ -2128,11 +2128,11 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, 
VTDContextEntry *ce,
         if (is_write && !(flpte & VTD_FL_RW_MASK)) {
             return -VTD_FR_WRITE;
         }
-        if (vtd_flpte_nonzero_rsvd(flpte, level)) {
+        if (vtd_flpte_nonzero_rsvd(flpte, *flpte_level)) {
             error_report_once("%s: detected flpte reserved non-zero "
                               "iova=0x%" PRIx64 ", level=0x%" PRIx32
                               "flpte=0x%" PRIx64 ", pasid=0x%" PRIX32 ")",
-                              __func__, iova, level, flpte, pasid);
+                              __func__, iova, *flpte_level, flpte, pasid);
             return -VTD_FR_PAGING_ENTRY_RSVD;
         }
 
@@ -2140,19 +2140,18 @@ static int vtd_iova_to_flpte(IntelIOMMUState *s, 
VTDContextEntry *ce,
             return -VTD_FR_FS_BIT_UPDATE_FAILED;
         }
 
-        if (vtd_is_last_pte(flpte, level)) {
+        if (vtd_is_last_pte(flpte, *flpte_level)) {
             if (is_write &&
                 (vtd_set_flag_in_pte(addr, offset, flpte, VTD_FL_D) !=
                                                                     MEMTX_OK)) 
{
                     return -VTD_FR_FS_BIT_UPDATE_FAILED;
             }
             *flptep = flpte;
-            *flpte_level = level;
             return 0;
         }
 
         addr = vtd_get_pte_addr(flpte, aw_bits);
-        level--;
+        (*flpte_level)--;
     }
 }
 
-- 
2.45.2