[PATCH v7 37/42] target/arm: Implement data cache set allocation tags

[Richard Henderson <richard.henderson@linaro.org>]

This is DC GVA and DC GZVA, and the tag check for DC ZVA.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
v2: Use allocation_tag_mem + memset.
v3: Require pre-cleaned addresses.
v6: Move DCZ block size assert to cpu realize.
    Perform a tag check for DC ZVA.
---
 target/arm/cpu.h           |  4 +++-
 target/arm/helper.c        | 16 ++++++++++++++++
 target/arm/translate-a64.c | 39 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index a5d3b6c9ee..17594226eb 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -2360,7 +2360,9 @@ static inline uint64_t cpreg_to_kvm_id(uint32_t cpregid)
 #define ARM_CP_NZCV              (ARM_CP_SPECIAL | 0x0300)
 #define ARM_CP_CURRENTEL         (ARM_CP_SPECIAL | 0x0400)
 #define ARM_CP_DC_ZVA            (ARM_CP_SPECIAL | 0x0500)
-#define ARM_LAST_SPECIAL         ARM_CP_DC_ZVA
+#define ARM_CP_DC_GVA            (ARM_CP_SPECIAL | 0x0600)
+#define ARM_CP_DC_GZVA           (ARM_CP_SPECIAL | 0x0700)
+#define ARM_LAST_SPECIAL         ARM_CP_DC_GZVA
 #define ARM_CP_FPU               0x1000
 #define ARM_CP_SVE               0x2000
 #define ARM_CP_NO_GDB            0x4000
diff --git a/target/arm/helper.c b/target/arm/helper.c
index c56e8e500b..3adafc07f0 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -6996,6 +6996,22 @@ static const ARMCPRegInfo mte_el0_cacheop_reginfo[] = {
       .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 14, .opc2 = 5,
       .type = ARM_CP_NOP, .access = PL0_W,
       .accessfn = aa64_cacheop_poc_access },
+    { .name = "DC_GVA", .state = ARM_CP_STATE_AA64,
+      .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 4, .opc2 = 3,
+      .access = PL0_W, .type = ARM_CP_DC_GVA,
+#ifndef CONFIG_USER_ONLY
+      /* Avoid overhead of an access check that always passes in user-mode */
+      .accessfn = aa64_zva_access,
+#endif
+    },
+    { .name = "DC_GZVA", .state = ARM_CP_STATE_AA64,
+      .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 4, .opc2 = 4,
+      .access = PL0_W, .type = ARM_CP_DC_GZVA,
+#ifndef CONFIG_USER_ONLY
+      /* Avoid overhead of an access check that always passes in user-mode */
+      .accessfn = aa64_zva_access,
+#endif
+    },
     REGINFO_SENTINEL
 };
 
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 394633babd..009cea6ed1 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -1865,6 +1865,45 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
         }
         gen_helper_dc_zva(cpu_env, tcg_rt);
         return;
+    case ARM_CP_DC_GVA:
+        {
+            TCGv_i64 clean_addr, tag;
+
+            /*
+             * DC_GVA, like DC_ZVA, requires that we supply the original
+             * pointer for an invalid page.  Probe that address first.
+             */
+            tcg_rt = cpu_reg(s, rt);
+            clean_addr = clean_data_tbi(s, tcg_rt);
+            gen_probe_access(s, clean_addr, MMU_DATA_STORE, MO_8);
+
+            if (s->ata) {
+                /* Extract the tag from the register to match STZGM.  */
+                tag = tcg_temp_new_i64();
+                tcg_gen_shri_i64(tag, tcg_rt, 56);
+                gen_helper_stzgm_tags(cpu_env, clean_addr, tag);
+                tcg_temp_free_i64(tag);
+            }
+        }
+        return;
+    case ARM_CP_DC_GZVA:
+        {
+            TCGv_i64 clean_addr, tag;
+
+            /* For DC_GZVA, we can rely on DC_ZVA for the proper fault. */
+            tcg_rt = cpu_reg(s, rt);
+            clean_addr = clean_data_tbi(s, tcg_rt);
+            gen_helper_dc_zva(cpu_env, clean_addr);
+
+            if (s->ata) {
+                /* Extract the tag from the register to match STZGM.  */
+                tag = tcg_temp_new_i64();
+                tcg_gen_shri_i64(tag, tcg_rt, 56);
+                gen_helper_stzgm_tags(cpu_env, clean_addr, tag);
+                tcg_temp_free_i64(tag);
+            }
+        }
+        return;
     default:
         break;
     }
-- 
2.25.1