[Qemu-devel] [PATCH v4 09/13] target-arm: Add ARMMMUFaultInfo

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Introduce ARMMMUFaultInfo to propagate MMU Fault information
across the MMU translation code path. This is in preparation for
adding Stage-2 translation.

No functional changes.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target-arm/helper.c    | 32 ++++++++++++++++++++------------
 target-arm/internals.h | 15 ++++++++++++++-
 target-arm/op_helper.c |  3 ++-
 3 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 17d0590..13d6c21 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -18,7 +18,8 @@
 static bool get_phys_addr(CPUARMState *env, target_ulong address,
                           int access_type, ARMMMUIdx mmu_idx,
                           hwaddr *phys_ptr, MemTxAttrs *attrs, int *prot,
-                          target_ulong *page_size, uint32_t *fsr);
+                          target_ulong *page_size, uint32_t *fsr,
+                          ARMMMUFaultInfo *fi);
 
 /* Definitions for the PMCCNTR and PMCR registers */
 #define PMCRD   0x8
@@ -1774,9 +1775,10 @@ static uint64_t do_ats_write(CPUARMState *env, uint64_t value,
     bool ret;
     uint64_t par64;
     MemTxAttrs attrs = {};
+    ARMMMUFaultInfo fi = {};
 
     ret = get_phys_addr(env, value, access_type, mmu_idx,
-                        &phys_addr, &attrs, &prot, &page_size, &fsr);
+                        &phys_addr, &attrs, &prot, &page_size, &fsr, &fi);
     if (extended_addresses_enabled(env)) {
         /* fsr is a DFSR/IFSR value for the long descriptor
          * translation table format, but with WnR always clear.
@@ -6167,7 +6169,8 @@ static uint64_t arm_ldq_ptw(CPUState *cs, hwaddr addr, bool is_secure)
 static bool get_phys_addr_v5(CPUARMState *env, uint32_t address,
                              int access_type, ARMMMUIdx mmu_idx,
                              hwaddr *phys_ptr, int *prot,
-                             target_ulong *page_size, uint32_t *fsr)
+                             target_ulong *page_size, uint32_t *fsr,
+                             ARMMMUFaultInfo *fi)
 {
     CPUState *cs = CPU(arm_env_get_cpu(env));
     int code;
@@ -6280,7 +6283,8 @@ do_fault:
 static bool get_phys_addr_v6(CPUARMState *env, uint32_t address,
                              int access_type, ARMMMUIdx mmu_idx,
                              hwaddr *phys_ptr, MemTxAttrs *attrs, int *prot,
-                             target_ulong *page_size, uint32_t *fsr)
+                             target_ulong *page_size, uint32_t *fsr,
+                             ARMMMUFaultInfo *fi)
 {
     CPUState *cs = CPU(arm_env_get_cpu(env));
     int code;
@@ -6490,7 +6494,8 @@ static bool check_s2_startlevel(ARMCPU *cpu, bool is_aa64, int startlevel,
 static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address,
                                int access_type, ARMMMUIdx mmu_idx,
                                hwaddr *phys_ptr, MemTxAttrs *txattrs, int *prot,
-                               target_ulong *page_size_ptr, uint32_t *fsr)
+                               target_ulong *page_size_ptr, uint32_t *fsr,
+                               ARMMMUFaultInfo *fi)
 {
     ARMCPU *cpu = arm_env_get_cpu(env);
     CPUState *cs = CPU(cpu);
@@ -7062,7 +7067,8 @@ static bool get_phys_addr_pmsav5(CPUARMState *env, uint32_t address,
 static bool get_phys_addr(CPUARMState *env, target_ulong address,
                           int access_type, ARMMMUIdx mmu_idx,
                           hwaddr *phys_ptr, MemTxAttrs *attrs, int *prot,
-                          target_ulong *page_size, uint32_t *fsr)
+                          target_ulong *page_size, uint32_t *fsr,
+                          ARMMMUFaultInfo *fi)
 {
     if (mmu_idx == ARMMMUIdx_S12NSE0 || mmu_idx == ARMMMUIdx_S12NSE1) {
         /* TODO: when we support EL2 we should here call ourselves recursively
@@ -7121,13 +7127,13 @@ static bool get_phys_addr(CPUARMState *env, target_ulong address,
 
     if (regime_using_lpae_format(env, mmu_idx)) {
         return get_phys_addr_lpae(env, address, access_type, mmu_idx, phys_ptr,
-                                  attrs, prot, page_size, fsr);
+                                  attrs, prot, page_size, fsr, fi);
     } else if (regime_sctlr(env, mmu_idx) & SCTLR_XP) {
         return get_phys_addr_v6(env, address, access_type, mmu_idx, phys_ptr,
-                                attrs, prot, page_size, fsr);
+                                attrs, prot, page_size, fsr, fi);
     } else {
         return get_phys_addr_v5(env, address, access_type, mmu_idx, phys_ptr,
-                                prot, page_size, fsr);
+                                prot, page_size, fsr, fi);
     }
 }
 
@@ -7136,7 +7142,8 @@ static bool get_phys_addr(CPUARMState *env, target_ulong address,
  * fsr with ARM DFSR/IFSR fault register format value on failure.
  */
 bool arm_tlb_fill(CPUState *cs, vaddr address,
-                  int access_type, int mmu_idx, uint32_t *fsr)
+                  int access_type, int mmu_idx, uint32_t *fsr,
+                  ARMMMUFaultInfo *fi)
 {
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
@@ -7147,7 +7154,7 @@ bool arm_tlb_fill(CPUState *cs, vaddr address,
     MemTxAttrs attrs = {};
 
     ret = get_phys_addr(env, address, access_type, mmu_idx, &phys_addr,
-                        &attrs, &prot, &page_size, fsr);
+                        &attrs, &prot, &page_size, fsr, fi);
     if (!ret) {
         /* Map a single [sub]page.  */
         phys_addr &= TARGET_PAGE_MASK;
@@ -7170,9 +7177,10 @@ hwaddr arm_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
     bool ret;
     uint32_t fsr;
     MemTxAttrs attrs = {};
+    ARMMMUFaultInfo fi = {};
 
     ret = get_phys_addr(env, addr, 0, cpu_mmu_index(env, false), &phys_addr,
-                        &attrs, &prot, &page_size, &fsr);
+                        &attrs, &prot, &page_size, &fsr, &fi);
 
     if (ret) {
         return -1;
diff --git a/target-arm/internals.h b/target-arm/internals.h
index 8bd37eb..412827b 100644
--- a/target-arm/internals.h
+++ b/target-arm/internals.h
@@ -414,8 +414,21 @@ bool arm_is_psci_call(ARMCPU *cpu, int excp_type);
 void arm_handle_psci_call(ARMCPU *cpu);
 #endif
 
+/**
+ * ARMMMUFaultInfo: Information describing an ARM MMU Fault
+ * @s2addr: Address that caused a fault at stage 2
+ * @stage2: True if we faulted at stage 2
+ * @s1ptw: True if we faulted at stage 2 while doing a stage 1 page-table walk
+ */
+typedef struct ARMMMUFaultInfo ARMMMUFaultInfo;
+struct ARMMMUFaultInfo {
+    target_ulong s2addr;
+    bool stage2;
+    bool s1ptw;
+};
+
 /* Do a page table walk and add page to TLB if possible */
 bool arm_tlb_fill(CPUState *cpu, vaddr address, int rw, int mmu_idx,
-                  uint32_t *fsr);
+                  uint32_t *fsr, ARMMMUFaultInfo *fi);
 
 #endif
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 1425a1d..7ff3c61 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -83,8 +83,9 @@ void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
 {
     bool ret;
     uint32_t fsr = 0;
+    struct ARMMMUFaultInfo fi = {0};
 
-    ret = arm_tlb_fill(cs, addr, is_write, mmu_idx, &fsr);
+    ret = arm_tlb_fill(cs, addr, is_write, mmu_idx, &fsr, &fi);
     if (unlikely(ret)) {
         ARMCPU *cpu = ARM_CPU(cs);
         CPUARMState *env = &cpu->env;
-- 
1.9.1