target/riscv: Convert to CPUClass::tlb_fill

Note that env->pc is removed from the qemu_log as that value is garbage.
The PC isn't recovered until cpu_restore_state, called from
cpu_loop_exit_restore, called from riscv_raise_exception.

Cc: qemu-riscv@nongnu.org
Cc: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/riscv/cpu.c

@@ -355,14 +355,13 @@ static void riscv_cpu_class_init(ObjectClass *c, void *data)
 #endif
     cc->gdb_stop_before_watchpoint = true;
     cc->disas_set_info = riscv_cpu_disas_set_info;
-#ifdef CONFIG_USER_ONLY
+#ifndef CONFIG_USER_ONLY
-    cc->handle_mmu_fault = riscv_cpu_handle_mmu_fault;
-#else
     cc->do_unaligned_access = riscv_cpu_do_unaligned_access;
     cc->get_phys_page_debug = riscv_cpu_get_phys_page_debug;
 #endif
 #ifdef CONFIG_TCG
     cc->tcg_initialize = riscv_translate_init;
+    cc->tlb_fill = riscv_cpu_tlb_fill;
 #endif
     /* For now, mark unmigratable: */
     cc->vmsd = &vmstate_riscv_cpu;

target/riscv/cpu.h

@@ -261,8 +261,9 @@ hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 void  riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                     MMUAccessType access_type, int mmu_idx,
                                     uintptr_t retaddr);
-int riscv_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size,
+bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
-                              int rw, int mmu_idx);
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr);
 char *riscv_isa_string(RISCVCPU *cpu);
 void riscv_cpu_list(void);
 

target/riscv/cpu_helper.c

@@ -379,53 +379,49 @@ void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     riscv_raise_exception(env, cs->exception_index, retaddr);
 }
 
-/* called by qemu's softmmu to fill the qemu tlb */
 void tlb_fill(CPUState *cs, target_ulong addr, int size,
         MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
 {
-    int ret;
+    riscv_cpu_tlb_fill(cs, addr, size, access_type, mmu_idx, false, retaddr);
-    ret = riscv_cpu_handle_mmu_fault(cs, addr, size, access_type, mmu_idx);
-    if (ret == TRANSLATE_FAIL) {
-        RISCVCPU *cpu = RISCV_CPU(cs);
-        CPURISCVState *env = &cpu->env;
-        riscv_raise_exception(env, cs->exception_index, retaddr);
-    }
 }
-
 #endif
 
-int riscv_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size,
+bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
-        int rw, int mmu_idx)
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
 {
+#ifndef CONFIG_USER_ONLY
     RISCVCPU *cpu = RISCV_CPU(cs);
     CPURISCVState *env = &cpu->env;
-#if !defined(CONFIG_USER_ONLY)
     hwaddr pa = 0;
     int prot;
-#endif
     int ret = TRANSLATE_FAIL;
 
-    qemu_log_mask(CPU_LOG_MMU,
+    qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n",
-            "%s pc " TARGET_FMT_lx " ad %" VADDR_PRIx " rw %d mmu_idx \
+                  __func__, address, access_type, mmu_idx);
-             %d\n", __func__, env->pc, address, rw, mmu_idx);
+
+    ret = get_physical_address(env, &pa, &prot, address, access_type, mmu_idx);
 
-#if !defined(CONFIG_USER_ONLY)
-    ret = get_physical_address(env, &pa, &prot, address, rw, mmu_idx);
     qemu_log_mask(CPU_LOG_MMU,
-            "%s address=%" VADDR_PRIx " ret %d physical " TARGET_FMT_plx
+                  "%s address=%" VADDR_PRIx " ret %d physical " TARGET_FMT_plx
-             " prot %d\n", __func__, address, ret, pa, prot);
+                  " prot %d\n", __func__, address, ret, pa, prot);
+
     if (riscv_feature(env, RISCV_FEATURE_PMP) &&
-        !pmp_hart_has_privs(env, pa, TARGET_PAGE_SIZE, 1 << rw)) {
+        !pmp_hart_has_privs(env, pa, TARGET_PAGE_SIZE, 1 << access_type)) {
         ret = TRANSLATE_FAIL;
     }
     if (ret == TRANSLATE_SUCCESS) {
         tlb_set_page(cs, address & TARGET_PAGE_MASK, pa & TARGET_PAGE_MASK,
                      prot, mmu_idx, TARGET_PAGE_SIZE);
-    } else if (ret == TRANSLATE_FAIL) {
+        return true;
-        raise_mmu_exception(env, address, rw);
+    } else if (probe) {
+        return false;
+    } else {
+        raise_mmu_exception(env, address, access_type);
+        riscv_raise_exception(env, cs->exception_index, retaddr);
     }
 #else
-    switch (rw) {
+    switch (access_type) {
     case MMU_INST_FETCH:
         cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT;
         break;
@@ -436,8 +432,8 @@ int riscv_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size,
         cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT;
         break;
     }
+    cpu_loop_exit_restore(cs, retaddr);
 #endif
-    return ret;
 }
 
 /*