qemu-kvm/SOURCES/kvm-hw-arm-smmu-common-Factorize-some-code-in-smmu_ptw_6.patch

From 79718d8c67c9c54fa86a77f66aa8784aca7651d5 Mon Sep 17 00:00:00 2001
From: eperezma <eperezma@redhat.com>
Date: Tue, 12 Jan 2021 14:36:26 -0500
Subject: [PATCH 02/17] hw/arm/smmu-common: Factorize some code in
 smmu_ptw_64()
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RH-Author: eperezma <eperezma@redhat.com>
Message-id: <20210112143638.374060-2-eperezma@redhat.com>
Patchwork-id: 100594
O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 01/13] hw/arm/smmu-common: Factorize some code in smmu_ptw_64()
Bugzilla: 1843852
RH-Acked-by: Xiao Wang <jasowang@redhat.com>
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Auger Eric <eric.auger@redhat.com>

From: Eric Auger <eric.auger@redhat.com>

Page and block PTE decoding can share some code. Let's
first handle table PTE and factorize some code shared by
page and block PTEs.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200728150815.11446-2-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 1733837d7cdb207653a849a5f1fa78de878c6ac1)
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/arm/smmu-common.c | 48 ++++++++++++++++----------------------------
 1 file changed, 17 insertions(+), 31 deletions(-)

diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 245817d23e9..d2ba8b224ba 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -187,7 +187,7 @@ static int smmu_ptw_64(SMMUTransCfg *cfg,
         uint64_t subpage_size = 1ULL << level_shift(level, granule_sz);
         uint64_t mask = subpage_size - 1;
         uint32_t offset = iova_level_offset(iova, inputsize, level, granule_sz);
-        uint64_t pte;
+        uint64_t pte, gpa;
         dma_addr_t pte_addr = baseaddr + offset * sizeof(pte);
         uint8_t ap;
 
@@ -200,56 +200,42 @@ static int smmu_ptw_64(SMMUTransCfg *cfg,
         if (is_invalid_pte(pte) || is_reserved_pte(pte, level)) {
             trace_smmu_ptw_invalid_pte(stage, level, baseaddr,
                                        pte_addr, offset, pte);
-            info->type = SMMU_PTW_ERR_TRANSLATION;
-            goto error;
+            break;
         }
 
-        if (is_page_pte(pte, level)) {
-            uint64_t gpa = get_page_pte_address(pte, granule_sz);
+        if (is_table_pte(pte, level)) {
+            ap = PTE_APTABLE(pte);
 
-            ap = PTE_AP(pte);
             if (is_permission_fault(ap, perm)) {
                 info->type = SMMU_PTW_ERR_PERMISSION;
                 goto error;
             }
-
-            tlbe->translated_addr = gpa + (iova & mask);
-            tlbe->perm = PTE_AP_TO_PERM(ap);
+            baseaddr = get_table_pte_address(pte, granule_sz);
+            level++;
+            continue;
+        } else if (is_page_pte(pte, level)) {
+            gpa = get_page_pte_address(pte, granule_sz);
             trace_smmu_ptw_page_pte(stage, level, iova,
                                     baseaddr, pte_addr, pte, gpa);
-            return 0;
-        }
-        if (is_block_pte(pte, level)) {
+        } else {
             uint64_t block_size;
-            hwaddr gpa = get_block_pte_address(pte, level, granule_sz,
-                                               &block_size);
-
-            ap = PTE_AP(pte);
-            if (is_permission_fault(ap, perm)) {
-                info->type = SMMU_PTW_ERR_PERMISSION;
-                goto error;
-            }
 
+            gpa = get_block_pte_address(pte, level, granule_sz,
+                                        &block_size);
             trace_smmu_ptw_block_pte(stage, level, baseaddr,
                                      pte_addr, pte, iova, gpa,
                                      block_size >> 20);
-
-            tlbe->translated_addr = gpa + (iova & mask);
-            tlbe->perm = PTE_AP_TO_PERM(ap);
-            return 0;
         }
-
-        /* table pte */
-        ap = PTE_APTABLE(pte);
-
+        ap = PTE_AP(pte);
         if (is_permission_fault(ap, perm)) {
             info->type = SMMU_PTW_ERR_PERMISSION;
             goto error;
         }
-        baseaddr = get_table_pte_address(pte, granule_sz);
-        level++;
-    }
 
+        tlbe->translated_addr = gpa + (iova & mask);
+        tlbe->perm = PTE_AP_TO_PERM(ap);
+        return 0;
+    }
     info->type = SMMU_PTW_ERR_TRANSLATION;
 
 error:
-- 
2.27.0