[PATCH v3 3/6] target/arm: Skip granule protection checks for AT instructions

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

GPC checks are not performed on the output address for AT instructions,
as stated by ARM DDI 0487J in D8.12.2:

  When populating PAR_EL1 with the result of an address translation
  instruction, granule protection checks are not performed on the final
  output address of a successful translation.

Rename get_phys_addr_with_secure(), since it's only used to handle AT
instructions.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/internals.h | 25 ++++++++++++++-----------
 target/arm/helper.c    |  8 ++++++--
 target/arm/ptw.c       | 11 ++++++-----
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/target/arm/internals.h b/target/arm/internals.h
index 0f01bc32a8..fc90c364f7 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1190,12 +1190,11 @@ typedef struct GetPhysAddrResult {
 } GetPhysAddrResult;
 
 /**
- * get_phys_addr_with_secure: get the physical address for a virtual address
+ * get_phys_addr: get the physical address for a virtual address
  * @env: CPUARMState
  * @address: virtual address to get physical address for
  * @access_type: 0 for read, 1 for write, 2 for execute
  * @mmu_idx: MMU index indicating required translation regime
- * @is_secure: security state for the access
  * @result: set on translation success.
  * @fi: set to fault info if the translation fails
  *
@@ -1212,26 +1211,30 @@ typedef struct GetPhysAddrResult {
  *  * for PSMAv5 based systems we don't bother to return a full FSR format
  *    value.
  */
-bool get_phys_addr_with_secure(CPUARMState *env, target_ulong address,
-                               MMUAccessType access_type,
-                               ARMMMUIdx mmu_idx, bool is_secure,
-                               GetPhysAddrResult *result, ARMMMUFaultInfo *fi)
+bool get_phys_addr(CPUARMState *env, target_ulong address,
+                   MMUAccessType access_type, ARMMMUIdx mmu_idx,
+                   GetPhysAddrResult *result, ARMMMUFaultInfo *fi)
     __attribute__((nonnull));
 
 /**
- * get_phys_addr: get the physical address for a virtual address
+ * get_phys_addr_with_secure_nogpc: get the physical address for a virtual
+ *                                  address
  * @env: CPUARMState
  * @address: virtual address to get physical address for
  * @access_type: 0 for read, 1 for write, 2 for execute
  * @mmu_idx: MMU index indicating required translation regime
+ * @is_secure: security state for the access
  * @result: set on translation success.
  * @fi: set to fault info if the translation fails
  *
- * Similarly, but use the security regime of @mmu_idx.
+ * Similar to get_phys_addr, but use the given security regime and don't perform
+ * a Granule Protection Check on the resulting address.
  */
-bool get_phys_addr(CPUARMState *env, target_ulong address,
-                   MMUAccessType access_type, ARMMMUIdx mmu_idx,
-                   GetPhysAddrResult *result, ARMMMUFaultInfo *fi)
+bool get_phys_addr_with_secure_nogpc(CPUARMState *env, target_ulong address,
+                                     MMUAccessType access_type,
+                                     ARMMMUIdx mmu_idx, bool is_secure,
+                                     GetPhysAddrResult *result,
+                                     ARMMMUFaultInfo *fi)
     __attribute__((nonnull));
 
 bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
diff --git a/target/arm/helper.c b/target/arm/helper.c
index a4c2c1bde5..427de6bd2a 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -3365,8 +3365,12 @@ static uint64_t do_ats_write(CPUARMState *env, uint64_t value,
     ARMMMUFaultInfo fi = {};
     GetPhysAddrResult res = {};
 
-    ret = get_phys_addr_with_secure(env, value, access_type, mmu_idx,
-                                    is_secure, &res, &fi);
+    /*
+     * I_MXTJT: Granule protection checks are not performed on the final address
+     * of a successful translation.
+     */
+    ret = get_phys_addr_with_secure_nogpc(env, value, access_type, mmu_idx,
+                                          is_secure, &res, &fi);
 
     /*
      * ATS operations only do S1 or S1+S2 translations, so we never
diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 063adbd84a..33179f3471 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -3418,16 +3418,17 @@ static bool get_phys_addr_gpc(CPUARMState *env, S1Translate *ptw,
     return false;
 }
 
-bool get_phys_addr_with_secure(CPUARMState *env, target_ulong address,
-                               MMUAccessType access_type, ARMMMUIdx mmu_idx,
-                               bool is_secure, GetPhysAddrResult *result,
-                               ARMMMUFaultInfo *fi)
+bool get_phys_addr_with_secure_nogpc(CPUARMState *env, target_ulong address,
+                                     MMUAccessType access_type,
+                                     ARMMMUIdx mmu_idx, bool is_secure,
+                                     GetPhysAddrResult *result,
+                                     ARMMMUFaultInfo *fi)
 {
     S1Translate ptw = {
         .in_mmu_idx = mmu_idx,
         .in_space = arm_secure_to_space(is_secure),
     };
-    return get_phys_addr_gpc(env, &ptw, address, access_type, result, fi);
+    return get_phys_addr_nogpc(env, &ptw, address, access_type, result, fi);
 }
 
 bool get_phys_addr(CPUARMState *env, target_ulong address,
-- 
2.41.0