target/riscv: Handle HLV, HSV via helpers

Implement these instructions via helpers, in expectation
of determining the mmu_idx to use at runtime.  This allows
the permission check to also be moved out of line, which
allows HLSX to be removed from TB_FLAGS.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Tested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-Id: <20230325105429.1142530-11-richard.henderson@linaro.org>
Message-Id: <20230412114333.118895-11-richard.henderson@linaro.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu.h

@@ -639,8 +639,7 @@ FIELD(TB_FLAGS, LMUL, 7, 3)
 FIELD(TB_FLAGS, SEW, 10, 3)
 FIELD(TB_FLAGS, VL_EQ_VLMAX, 13, 1)
 FIELD(TB_FLAGS, VILL, 14, 1)
-/* Is a Hypervisor instruction load/store allowed? */
+FIELD(TB_FLAGS, VSTART_EQ_ZERO, 15, 1)
-FIELD(TB_FLAGS, HLSX, 15, 1)
 /* The combination of MXL/SXL/UXL that applies to the current cpu mode. */
 FIELD(TB_FLAGS, XL, 16, 2)
 /* If PointerMasking should be applied */
@@ -652,8 +651,7 @@ FIELD(TB_FLAGS, VMA, 21, 1)
 FIELD(TB_FLAGS, ITRIGGER, 22, 1)
 /* Virtual mode enabled */
 FIELD(TB_FLAGS, VIRT_ENABLED, 23, 1)
-FIELD(TB_FLAGS, VSTART_EQ_ZERO, 24, 1)
+FIELD(TB_FLAGS, PRIV, 24, 2)
-FIELD(TB_FLAGS, PRIV, 25, 2)
 
 #ifdef TARGET_RISCV32
 #define riscv_cpu_mxl(env)  ((void)(env), MXL_RV32)

target/riscv/cpu_helper.c

@@ -102,24 +102,16 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
     fs = get_field(env->mstatus, MSTATUS_FS);
     vs = get_field(env->mstatus, MSTATUS_VS);
 
-    if (riscv_has_ext(env, RVH)) {
+    if (env->virt_enabled) {
-        if (env->priv == PRV_M ||
+        flags = FIELD_DP32(flags, TB_FLAGS, VIRT_ENABLED, 1);
-            (env->priv == PRV_S && !env->virt_enabled) ||
+        /*
-            (env->priv == PRV_U && !env->virt_enabled &&
+         * Merge DISABLED and !DIRTY states using MIN.
-             get_field(env->hstatus, HSTATUS_HU))) {
+         * We will set both fields when dirtying.
-            flags = FIELD_DP32(flags, TB_FLAGS, HLSX, 1);
+         */
-        }
+        fs = MIN(fs, get_field(env->mstatus_hs, MSTATUS_FS));
-
+        vs = MIN(vs, get_field(env->mstatus_hs, MSTATUS_VS));
-        if (env->virt_enabled) {
-            flags = FIELD_DP32(flags, TB_FLAGS, VIRT_ENABLED, 1);
-            /*
-             * Merge DISABLED and !DIRTY states using MIN.
-             * We will set both fields when dirtying.
-             */
-            fs = MIN(fs, get_field(env->mstatus_hs, MSTATUS_FS));
-            vs = MIN(vs, get_field(env->mstatus_hs, MSTATUS_VS));
-        }
     }
+
     if (cpu->cfg.debug && !icount_enabled()) {
         flags = FIELD_DP32(flags, TB_FLAGS, ITRIGGER, env->itrigger_enabled);
     }

target/riscv/helper.h

@@ -123,8 +123,16 @@ DEF_HELPER_1(itrigger_match, void, env)
 #ifndef CONFIG_USER_ONLY
 DEF_HELPER_1(hyp_tlb_flush, void, env)
 DEF_HELPER_1(hyp_gvma_tlb_flush, void, env)
-DEF_HELPER_2(hyp_hlvx_hu, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlv_bu, TCG_CALL_NO_WG, tl, env, tl)
-DEF_HELPER_2(hyp_hlvx_wu, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlv_hu, TCG_CALL_NO_WG, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlv_wu, TCG_CALL_NO_WG, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlv_d, TCG_CALL_NO_WG, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlvx_hu, TCG_CALL_NO_WG, tl, env, tl)
+DEF_HELPER_FLAGS_2(hyp_hlvx_wu, TCG_CALL_NO_WG, tl, env, tl)
+DEF_HELPER_FLAGS_3(hyp_hsv_b, TCG_CALL_NO_WG, void, env, tl, tl)
+DEF_HELPER_FLAGS_3(hyp_hsv_h, TCG_CALL_NO_WG, void, env, tl, tl)
+DEF_HELPER_FLAGS_3(hyp_hsv_w, TCG_CALL_NO_WG, void, env, tl, tl)
+DEF_HELPER_FLAGS_3(hyp_hsv_d, TCG_CALL_NO_WG, void, env, tl, tl)
 #endif
 
 /* Vector functions */

target/riscv/insn_trans/trans_rvh.c.inc

@@ -16,158 +16,131 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef CONFIG_USER_ONLY
-static bool check_access(DisasContext *ctx)
-{
-    if (!ctx->hlsx) {
-        tcg_gen_st_i32(tcg_constant_i32(ctx->opcode), cpu_env,
-                       offsetof(CPURISCVState, bins));
-        if (ctx->virt_enabled) {
-            generate_exception(ctx, RISCV_EXCP_VIRT_INSTRUCTION_FAULT);
-        } else {
-            generate_exception(ctx, RISCV_EXCP_ILLEGAL_INST);
-        }
-        return false;
-    }
-    return true;
-}
-#endif
-
-static bool do_hlv(DisasContext *ctx, arg_r2 *a, MemOp mop)
-{
 #ifdef CONFIG_USER_ONLY
-    return false;
+#define do_hlv(ctx, a, func)  false
+#define do_hsv(ctx, a, func)  false
 #else
-    decode_save_opc(ctx);
+static void gen_helper_hyp_hlv_b(TCGv r, TCGv_env e, TCGv a)
-    if (check_access(ctx)) {
+{
-        TCGv dest = dest_gpr(ctx, a->rd);
+    gen_helper_hyp_hlv_bu(r, e, a);
-        TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
+    tcg_gen_ext8s_tl(r, r);
-        int mem_idx = ctx->mem_idx | MMU_HYP_ACCESS_BIT;
-        tcg_gen_qemu_ld_tl(dest, addr, mem_idx, mop);
-        gen_set_gpr(ctx, a->rd, dest);
-    }
-    return true;
-#endif
 }
 
+static void gen_helper_hyp_hlv_h(TCGv r, TCGv_env e, TCGv a)
+{
+    gen_helper_hyp_hlv_hu(r, e, a);
+    tcg_gen_ext16s_tl(r, r);
+}
+
+static void gen_helper_hyp_hlv_w(TCGv r, TCGv_env e, TCGv a)
+{
+    gen_helper_hyp_hlv_wu(r, e, a);
+    tcg_gen_ext32s_tl(r, r);
+}
+
+static bool do_hlv(DisasContext *ctx, arg_r2 *a,
+                   void (*func)(TCGv, TCGv_env, TCGv))
+{
+    TCGv dest = dest_gpr(ctx, a->rd);
+    TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
+
+    decode_save_opc(ctx);
+    func(dest, cpu_env, addr);
+    gen_set_gpr(ctx, a->rd, dest);
+    return true;
+}
+
+static bool do_hsv(DisasContext *ctx, arg_r2_s *a,
+                   void (*func)(TCGv_env, TCGv, TCGv))
+{
+    TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
+    TCGv data = get_gpr(ctx, a->rs2, EXT_NONE);
+
+    decode_save_opc(ctx);
+    func(cpu_env, addr, data);
+    return true;
+}
+#endif /* CONFIG_USER_ONLY */
+
 static bool trans_hlv_b(DisasContext *ctx, arg_hlv_b *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_SB);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_b);
 }
 
 static bool trans_hlv_h(DisasContext *ctx, arg_hlv_h *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_TESW);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_h);
 }
 
 static bool trans_hlv_w(DisasContext *ctx, arg_hlv_w *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_TESL);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_w);
 }
 
 static bool trans_hlv_bu(DisasContext *ctx, arg_hlv_bu *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_UB);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_bu);
 }
 
 static bool trans_hlv_hu(DisasContext *ctx, arg_hlv_hu *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_TEUW);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_hu);
-}
-
-static bool do_hsv(DisasContext *ctx, arg_r2_s *a, MemOp mop)
-{
-#ifdef CONFIG_USER_ONLY
-    return false;
-#else
-    decode_save_opc(ctx);
-    if (check_access(ctx)) {
-        TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
-        TCGv data = get_gpr(ctx, a->rs2, EXT_NONE);
-        int mem_idx = ctx->mem_idx | MMU_HYP_ACCESS_BIT;
-        tcg_gen_qemu_st_tl(data, addr, mem_idx, mop);
-    }
-    return true;
-#endif
 }
 
 static bool trans_hsv_b(DisasContext *ctx, arg_hsv_b *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hsv(ctx, a, MO_SB);
+    return do_hsv(ctx, a, gen_helper_hyp_hsv_b);
 }
 
 static bool trans_hsv_h(DisasContext *ctx, arg_hsv_h *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hsv(ctx, a, MO_TESW);
+    return do_hsv(ctx, a, gen_helper_hyp_hsv_h);
 }
 
 static bool trans_hsv_w(DisasContext *ctx, arg_hsv_w *a)
 {
     REQUIRE_EXT(ctx, RVH);
-    return do_hsv(ctx, a, MO_TESL);
+    return do_hsv(ctx, a, gen_helper_hyp_hsv_w);
 }
 
 static bool trans_hlv_wu(DisasContext *ctx, arg_hlv_wu *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_TEUL);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_wu);
 }
 
 static bool trans_hlv_d(DisasContext *ctx, arg_hlv_d *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVH);
-    return do_hlv(ctx, a, MO_TEUQ);
+    return do_hlv(ctx, a, gen_helper_hyp_hlv_d);
 }
 
 static bool trans_hsv_d(DisasContext *ctx, arg_hsv_d *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVH);
-    return do_hsv(ctx, a, MO_TEUQ);
+    return do_hsv(ctx, a, gen_helper_hyp_hsv_d);
 }
 
-#ifndef CONFIG_USER_ONLY
-static bool do_hlvx(DisasContext *ctx, arg_r2 *a,
-                    void (*func)(TCGv, TCGv_env, TCGv))
-{
-    decode_save_opc(ctx);
-    if (check_access(ctx)) {
-        TCGv dest = dest_gpr(ctx, a->rd);
-        TCGv addr = get_gpr(ctx, a->rs1, EXT_NONE);
-        func(dest, cpu_env, addr);
-        gen_set_gpr(ctx, a->rd, dest);
-    }
-    return true;
-}
-#endif
-
 static bool trans_hlvx_hu(DisasContext *ctx, arg_hlvx_hu *a)
 {
     REQUIRE_EXT(ctx, RVH);
-#ifndef CONFIG_USER_ONLY
+    return do_hlv(ctx, a, gen_helper_hyp_hlvx_hu);
-    return do_hlvx(ctx, a, gen_helper_hyp_hlvx_hu);
-#else
-    return false;
-#endif
 }
 
 static bool trans_hlvx_wu(DisasContext *ctx, arg_hlvx_wu *a)
 {
     REQUIRE_EXT(ctx, RVH);
-#ifndef CONFIG_USER_ONLY
+    return do_hlv(ctx, a, gen_helper_hyp_hlvx_wu);
-    return do_hlvx(ctx, a, gen_helper_hyp_hlvx_wu);
-#else
-    return false;
-#endif
 }
 
 static bool trans_hfence_gvma(DisasContext *ctx, arg_sfence_vma *a)

target/riscv/op_helper.c

@@ -427,6 +427,91 @@ void helper_hyp_gvma_tlb_flush(CPURISCVState *env)
     helper_hyp_tlb_flush(env);
 }
 
+static int check_access_hlsv(CPURISCVState *env, bool x, uintptr_t ra)
+{
+    if (env->priv == PRV_M) {
+        /* always allowed */
+    } else if (env->virt_enabled) {
+        riscv_raise_exception(env, RISCV_EXCP_VIRT_INSTRUCTION_FAULT, ra);
+    } else if (env->priv == PRV_U && !get_field(env->hstatus, HSTATUS_HU)) {
+        riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, ra);
+    }
+
+    return cpu_mmu_index(env, x) | MMU_HYP_ACCESS_BIT;
+}
+
+target_ulong helper_hyp_hlv_bu(CPURISCVState *env, target_ulong addr)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_UB, mmu_idx);
+
+    return cpu_ldb_mmu(env, addr, oi, ra);
+}
+
+target_ulong helper_hyp_hlv_hu(CPURISCVState *env, target_ulong addr)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUW, mmu_idx);
+
+    return cpu_ldw_mmu(env, addr, oi, ra);
+}
+
+target_ulong helper_hyp_hlv_wu(CPURISCVState *env, target_ulong addr)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUL, mmu_idx);
+
+    return cpu_ldl_mmu(env, addr, oi, ra);
+}
+
+target_ulong helper_hyp_hlv_d(CPURISCVState *env, target_ulong addr)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUQ, mmu_idx);
+
+    return cpu_ldq_mmu(env, addr, oi, ra);
+}
+
+void helper_hyp_hsv_b(CPURISCVState *env, target_ulong addr, target_ulong val)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_UB, mmu_idx);
+
+    cpu_stb_mmu(env, addr, val, oi, ra);
+}
+
+void helper_hyp_hsv_h(CPURISCVState *env, target_ulong addr, target_ulong val)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUW, mmu_idx);
+
+    cpu_stw_mmu(env, addr, val, oi, ra);
+}
+
+void helper_hyp_hsv_w(CPURISCVState *env, target_ulong addr, target_ulong val)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUL, mmu_idx);
+
+    cpu_stl_mmu(env, addr, val, oi, ra);
+}
+
+void helper_hyp_hsv_d(CPURISCVState *env, target_ulong addr, target_ulong val)
+{
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, false, ra);
+    MemOpIdx oi = make_memop_idx(MO_TEUQ, mmu_idx);
+
+    cpu_stq_mmu(env, addr, val, oi, ra);
+}
+
 /*
  * TODO: These implementations are not quite correct.  They perform the
  * access using execute permission just fine, but the final PMP check
@@ -434,20 +519,22 @@ void helper_hyp_gvma_tlb_flush(CPURISCVState *env)
  * a fair fraction of cputlb.c, fixing this requires adding new mmu_idx
  * which would imply that exact check in tlb_fill.
  */
-target_ulong helper_hyp_hlvx_hu(CPURISCVState *env, target_ulong address)
+target_ulong helper_hyp_hlvx_hu(CPURISCVState *env, target_ulong addr)
 {
-    int mmu_idx = cpu_mmu_index(env, true) | MMU_HYP_ACCESS_BIT;
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, true, ra);
     MemOpIdx oi = make_memop_idx(MO_TEUW, mmu_idx);
 
-    return cpu_ldw_code_mmu(env, address, oi, GETPC());
+    return cpu_ldw_code_mmu(env, addr, oi, GETPC());
 }
 
-target_ulong helper_hyp_hlvx_wu(CPURISCVState *env, target_ulong address)
+target_ulong helper_hyp_hlvx_wu(CPURISCVState *env, target_ulong addr)
 {
-    int mmu_idx = cpu_mmu_index(env, true) | MMU_HYP_ACCESS_BIT;
+    uintptr_t ra = GETPC();
+    int mmu_idx = check_access_hlsv(env, true, ra);
     MemOpIdx oi = make_memop_idx(MO_TEUL, mmu_idx);
 
-    return cpu_ldl_code_mmu(env, address, oi, GETPC());
+    return cpu_ldl_code_mmu(env, addr, oi, ra);
 }
 
 #endif /* !CONFIG_USER_ONLY */

target/riscv/translate.c

@@ -80,7 +80,6 @@ typedef struct DisasContext {
     bool virt_inst_excp;
     bool virt_enabled;
     const RISCVCPUConfig *cfg_ptr;
-    bool hlsx;
     /* vector extension */
     bool vill;
     /*
@@ -1163,7 +1162,6 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->misa_ext = env->misa_ext;
     ctx->frm = -1;  /* unknown rounding mode */
     ctx->cfg_ptr = &(cpu->cfg);
-    ctx->hlsx = FIELD_EX32(tb_flags, TB_FLAGS, HLSX);
     ctx->vill = FIELD_EX32(tb_flags, TB_FLAGS, VILL);
     ctx->sew = FIELD_EX32(tb_flags, TB_FLAGS, SEW);
     ctx->lmul = sextract32(FIELD_EX32(tb_flags, TB_FLAGS, LMUL), 0, 3);