qom/cpu: move tlb_flush to cpu_common_reset

It is a common thing amongst the various cpu reset functions want to
flush the SoftMMU's TLB entries. This is done either by calling
tlb_flush directly or by way of a general memset of the CPU
structure (sometimes both).

This moves the tlb_flush call to the common reset function and
additionally ensures it is only done for the CONFIG_SOFTMMU case and
when tcg is enabled.

In some target cases we add an empty end_of_reset_fields structure to the
target vCPU structure so have a clear end point for any memset which
is resetting value in the structure before CPU_COMMON (where the TLB
structures are).

While this is a nice clean-up in general it is also a precursor for
changes coming to cputlb for MTTCG where the clearing of entries
can't be done arbitrarily across vCPUs. Currently the cpu_reset
function is usually called from the context of another vCPU as the
architectural power up sequence is run. By using the cputlb API
functions we can ensure the right behaviour in the future.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

qom/cpu.c

@@ -273,6 +273,10 @@ static void cpu_common_reset(CPUState *cpu)
     for (i = 0; i < TB_JMP_CACHE_SIZE; ++i) {
         atomic_set(&cpu->tb_jmp_cache[i], NULL);
     }
+
+#ifdef CONFIG_SOFTMMU
+    tlb_flush(cpu, 0);
+#endif
 }
 
 static bool cpu_common_has_work(CPUState *cs)

target/arm/cpu.c

@@ -122,7 +122,8 @@ static void arm_cpu_reset(CPUState *s)
 
     acc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUARMState, features));
+    memset(env, 0, offsetof(CPUARMState, end_reset_fields));
+
     g_hash_table_foreach(cpu->cp_regs, cp_reg_reset, cpu);
     g_hash_table_foreach(cpu->cp_regs, cp_reg_check_reset, cpu);
 
@@ -226,8 +227,6 @@ static void arm_cpu_reset(CPUState *s)
                               &env->vfp.fp_status);
     set_float_detect_tininess(float_tininess_before_rounding,
                               &env->vfp.standard_fp_status);
-    tlb_flush(s, 1);
-
 #ifndef CONFIG_USER_ONLY
     if (kvm_enabled()) {
         kvm_arm_reset_vcpu(cpu);

target/arm/cpu.h

@@ -491,9 +491,12 @@ typedef struct CPUARMState {
     struct CPUBreakpoint *cpu_breakpoint[16];
     struct CPUWatchpoint *cpu_watchpoint[16];
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
-    /* These fields after the common ones so they are preserved on reset.  */
+    /* Fields after CPU_COMMON are preserved across CPU reset. */
 
     /* Internal CPU feature flags.  */
     uint64_t features;

target/cris/cpu.c

@@ -52,9 +52,8 @@ static void cris_cpu_reset(CPUState *s)
     ccc->parent_reset(s);
 
     vr = env->pregs[PR_VR];
-    memset(env, 0, offsetof(CPUCRISState, load_info));
+    memset(env, 0, offsetof(CPUCRISState, end_reset_fields));
     env->pregs[PR_VR] = vr;
-    tlb_flush(s, 1);
 
 #if defined(CONFIG_USER_ONLY)
     /* start in user mode with interrupts enabled.  */

target/cris/cpu.h

@@ -167,10 +167,13 @@ typedef struct CPUCRISState {
 	 */
         TLBSet tlbsets[2][4][16];
 
-	CPU_COMMON
+        /* Fields up to this point are cleared by a CPU reset */
+        struct {} end_reset_fields;
 
-    /* Members from load_info on are preserved across resets.  */
-    void *load_info;
+        CPU_COMMON
+
+        /* Members from load_info on are preserved across resets.  */
+        void *load_info;
 } CPUCRISState;
 
 /**

target/i386/cpu.c

@@ -2819,8 +2819,6 @@ static void x86_cpu_reset(CPUState *s)
 
     memset(env, 0, offsetof(CPUX86State, end_reset_fields));
 
-    tlb_flush(s, 1);
-
     env->old_exception = -1;
 
     /* init to reset state */

target/i386/cpu.h

@@ -1123,10 +1123,12 @@ typedef struct CPUX86State {
     uint8_t nmi_injected;
     uint8_t nmi_pending;
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
-    /* Fields from here on are preserved across CPU reset. */
-    struct {} end_reset_fields;
+    /* Fields after CPU_COMMON are preserved across CPU reset. */
 
     /* processor features (e.g. for CPUID insn) */
     /* Minimum level/xlevel/xlevel2, based on CPU model + features */

target/lm32/cpu.c

@@ -128,10 +128,9 @@ static void lm32_cpu_reset(CPUState *s)
     lcc->parent_reset(s);
 
     /* reset cpu state */
-    memset(env, 0, offsetof(CPULM32State, eba));
+    memset(env, 0, offsetof(CPULM32State, end_reset_fields));
 
     lm32_cpu_init_cfg_reg(cpu);
-    tlb_flush(s, 1);
 }
 
 static void lm32_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)

target/lm32/cpu.h

@@ -165,6 +165,9 @@ struct CPULM32State {
     struct CPUBreakpoint *cpu_breakpoint[4];
     struct CPUWatchpoint *cpu_watchpoint[4];
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved across CPU reset. */

target/m68k/cpu.c

@@ -52,7 +52,7 @@ static void m68k_cpu_reset(CPUState *s)
 
     mcc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUM68KState, features));
+    memset(env, 0, offsetof(CPUM68KState, end_reset_fields));
 #if !defined(CONFIG_USER_ONLY)
     env->sr = 0x2700;
 #endif
@@ -61,7 +61,6 @@ static void m68k_cpu_reset(CPUState *s)
     cpu_m68k_set_ccr(env, 0);
     /* TODO: We should set PC from the interrupt vector.  */
     env->pc = 0;
-    tlb_flush(s, 1);
 }
 
 static void m68k_cpu_disas_set_info(CPUState *s, disassemble_info *info)

target/m68k/cpu.h

@@ -111,6 +111,9 @@ typedef struct CPUM68KState {
 
     uint32_t qregs[MAX_QREGS];
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved across CPU reset. */

target/microblaze/cpu.c

@@ -103,9 +103,8 @@ static void mb_cpu_reset(CPUState *s)
 
     mcc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUMBState, pvr));
+    memset(env, 0, offsetof(CPUMBState, end_reset_fields));
     env->res_addr = RES_ADDR_NONE;
-    tlb_flush(s, 1);
 
     /* Disable stack protector.  */
     env->shr = ~0;

target/microblaze/cpu.h

@@ -267,6 +267,9 @@ struct CPUMBState {
     struct microblaze_mmu mmu;
 #endif
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* These fields are preserved on reset.  */

target/mips/cpu.c

@@ -100,8 +100,7 @@ static void mips_cpu_reset(CPUState *s)
 
     mcc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUMIPSState, mvp));
-    tlb_flush(s, 1);
+    memset(env, 0, offsetof(CPUMIPSState, end_reset_fields));
 
     cpu_state_reset(env);
 

target/mips/cpu.h

@@ -607,6 +607,9 @@ struct CPUMIPSState {
     uint32_t CP0_TCStatus_rw_bitmask; /* Read/write bits in CP0_TCStatus */
     int insn_flags; /* Supported instruction set */
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved across CPU reset. */

target/moxie/cpu.c

@@ -45,10 +45,8 @@ static void moxie_cpu_reset(CPUState *s)
 
     mcc->parent_reset(s);
 
-    memset(env, 0, sizeof(CPUMoxieState));
+    memset(env, 0, offsetof(CPUMoxieState, end_reset_fields));
     env->pc = 0x1000;
-
-    tlb_flush(s, 1);
 }
 
 static void moxie_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)

target/moxie/cpu.h

@@ -56,6 +56,9 @@ typedef struct CPUMoxieState {
 
     void *irq[8];
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
 } CPUMoxieState;

target/openrisc/cpu.c

@@ -44,14 +44,7 @@ static void openrisc_cpu_reset(CPUState *s)
 
     occ->parent_reset(s);
 
-#ifndef CONFIG_USER_ONLY
-    memset(&cpu->env, 0, offsetof(CPUOpenRISCState, tlb));
-#else
-    memset(&cpu->env, 0, offsetof(CPUOpenRISCState, irq));
-#endif
-
-    tlb_flush(s, 1);
-    /*tb_flush(&cpu->env);    FIXME: Do we need it?  */
+    memset(&cpu->env, 0, offsetof(CPUOpenRISCState, end_reset_fields));
 
     cpu->env.pc = 0x100;
     cpu->env.sr = SR_FO | SR_SM;

target/openrisc/cpu.h

@@ -300,6 +300,9 @@ typedef struct CPUOpenRISCState {
                                  in solt so far.  */
     uint32_t btaken;          /* the SR_F bit */
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved across CPU reset. */

target/ppc/translate_init.c

@@ -10415,9 +10415,6 @@ static void ppc_cpu_reset(CPUState *s)
         }
         env->spr[i] = spr->default_value;
     }
-
-    /* Flush all TLBs */
-    tlb_flush(s, 1);
 }
 
 #ifndef CONFIG_USER_ONLY

target/s390x/cpu.c

@@ -82,7 +82,6 @@ static void s390_cpu_reset(CPUState *s)
     scc->parent_reset(s);
     cpu->env.sigp_order = 0;
     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
-    tlb_flush(s, 1);
 }
 
 /* S390CPUClass::initial_reset() */
@@ -94,7 +93,7 @@ static void s390_cpu_initial_reset(CPUState *s)
 
     s390_cpu_reset(s);
     /* initial reset does not touch regs,fregs and aregs */
-    memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
+    memset(&env->fpc, 0, offsetof(CPUS390XState, end_reset_fields) -
                          offsetof(CPUS390XState, fpc));
 
     /* architectured initial values for CR 0 and 14 */
@@ -118,7 +117,6 @@ static void s390_cpu_initial_reset(CPUState *s)
     if (kvm_enabled()) {
         kvm_s390_reset_vcpu(cpu);
     }
-    tlb_flush(s, 1);
 }
 
 /* CPUClass:reset() */
@@ -133,7 +131,7 @@ static void s390_cpu_full_reset(CPUState *s)
     cpu->env.sigp_order = 0;
     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 
-    memset(env, 0, offsetof(CPUS390XState, cpu_num));
+    memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 
     /* architectured initial values for CR 0 and 14 */
     env->cregs[0] = CR0_RESET;
@@ -156,7 +154,6 @@ static void s390_cpu_full_reset(CPUState *s)
     if (kvm_enabled()) {
         kvm_s390_reset_vcpu(cpu);
     }
-    tlb_flush(s, 1);
 }
 
 #if !defined(CONFIG_USER_ONLY)

target/s390x/cpu.h

@@ -139,9 +139,10 @@ typedef struct CPUS390XState {
 
     uint8_t riccb[64];
 
-    CPU_COMMON
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
 
-    /* reset does memset(0) up to here */
+    CPU_COMMON
 
     uint32_t cpu_num;
     uint32_t machine_type;

target/sh4/cpu.c

@@ -56,8 +56,7 @@ static void superh_cpu_reset(CPUState *s)
 
     scc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUSH4State, id));
-    tlb_flush(s, 1);
+    memset(env, 0, offsetof(CPUSH4State, end_reset_fields));
 
     env->pc = 0xA0000000;
 #if defined(CONFIG_USER_ONLY)

target/sh4/cpu.h

@@ -175,6 +175,9 @@ typedef struct CPUSH4State {
 
     uint32_t ldst;
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved over CPU reset. */

target/sparc/cpu.c

@@ -36,8 +36,7 @@ static void sparc_cpu_reset(CPUState *s)
 
     scc->parent_reset(s);
 
-    memset(env, 0, offsetof(CPUSPARCState, version));
-    tlb_flush(s, 1);
+    memset(env, 0, offsetof(CPUSPARCState, end_reset_fields));
     env->cwp = 0;
 #ifndef TARGET_SPARC64
     env->wim = 1;

target/sparc/cpu.h

@@ -419,6 +419,9 @@ struct CPUSPARCState {
     /* NOTE: we allow 8 more registers to handle wrapping */
     target_ulong regbase[MAX_NWINDOWS * 16 + 8];
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 
     /* Fields from here on are preserved across CPU reset. */

target/tilegx/cpu.c

@@ -84,8 +84,7 @@ static void tilegx_cpu_reset(CPUState *s)
 
     tcc->parent_reset(s);
 
-    memset(env, 0, sizeof(CPUTLGState));
-    tlb_flush(s, 1);
+    memset(env, 0, offsetof(CPUTLGState, end_reset_fields));
 }
 
 static void tilegx_cpu_realizefn(DeviceState *dev, Error **errp)

target/tilegx/cpu.h

@@ -97,6 +97,9 @@ typedef struct CPUTLGState {
     uint32_t sigcode;                  /* Signal code */
 #endif
 
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
+
     CPU_COMMON
 } CPUTLGState;
 

target/tricore/cpu.c

@@ -53,8 +53,6 @@ static void tricore_cpu_reset(CPUState *s)
 
     tcc->parent_reset(s);
 
-    tlb_flush(s, 1);
-
     cpu_state_reset(env);
 }