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>

29 files changed, 62 insertions, 50 deletions

diff --git a/qom/cpu.c b/qom/cpu.c
index 03d9190..cc51de2 100644
--- a/qom/cpu.c
+++ b/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)
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index f5cb30a..9104611 100644
--- a/target/arm/cpu.c
+++ b/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);
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index ab119e6..7bd16ee 100644
--- a/target/arm/cpu.h
+++ b/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;
diff --git a/target/cris/cpu.c b/target/cris/cpu.c
index 2e9ab97..5f766f0 100644
--- a/target/cris/cpu.c
+++ b/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.  */
diff --git a/target/cris/cpu.h b/target/cris/cpu.h
index 43d5f9d..920e1c3 100644
--- a/target/cris/cpu.h
+++ b/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;
 
 /**
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index b0640f1..b76e1d8 100644
--- a/target/i386/cpu.c
+++ b/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 */
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index a04e46b..6c1902b 100644
--- a/target/i386/cpu.h
+++ b/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 */
diff --git a/target/lm32/cpu.c b/target/lm32/cpu.c
index 8d939a7..2b8c36b 100644
--- a/target/lm32/cpu.c
+++ b/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)
diff --git a/target/lm32/cpu.h b/target/lm32/cpu.h
index d8a3515..1d972cb 100644
--- a/target/lm32/cpu.h
+++ b/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. */
diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index ba17480..fa10b6e 100644
--- a/target/m68k/cpu.c
+++ b/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)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index 0b4ed7b..aeac95d 100644
--- a/target/m68k/cpu.h
+++ b/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. */
diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
index 389c7b6..3d58869 100644
--- a/target/microblaze/cpu.c
+++ b/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;
diff --git a/target/microblaze/cpu.h b/target/microblaze/cpu.h
index beb75ff..bf6963b 100644
--- a/target/microblaze/cpu.h
+++ b/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.  */
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 65ca607..1bb66b7 100644
--- a/target/mips/cpu.c
+++ b/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);
 
diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index 5182dc7..3146a60 100644
--- a/target/mips/cpu.h
+++ b/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. */
diff --git a/target/moxie/cpu.c b/target/moxie/cpu.c
index b0be4a7..927b1a1 100644
--- a/target/moxie/cpu.c
+++ b/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)
diff --git a/target/moxie/cpu.h b/target/moxie/cpu.h
index 3e880fa..8991aae 100644
--- a/target/moxie/cpu.h
+++ b/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;
diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
index 698e87b..422139d 100644
--- a/target/openrisc/cpu.c
+++ b/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;
diff --git a/target/openrisc/cpu.h b/target/openrisc/cpu.h
index aaf1535..508ef56 100644
--- a/target/openrisc/cpu.h
+++ b/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. */
diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
index 626e031..4ff9872 100644
--- a/target/ppc/translate_init.c
+++ b/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
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 0a39d31..066dcd1 100644
--- a/target/s390x/cpu.c
+++ b/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)
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index fd36a25..058ddad 100644
--- a/target/s390x/cpu.h
+++ b/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;
diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
index a38f6a6..9a481c3 100644
--- a/target/sh4/cpu.c
+++ b/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)
diff --git a/target/sh4/cpu.h b/target/sh4/cpu.h
index 478ab55..cad8989 100644
--- a/target/sh4/cpu.h
+++ b/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. */
diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
index 4e07b92..d6583f1 100644
--- a/target/sparc/cpu.c
+++ b/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;
diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h
index 5fb0ed1..601c018 100644
--- a/target/sparc/cpu.h
+++ b/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. */
diff --git a/target/tilegx/cpu.c b/target/tilegx/cpu.c
index 454793f..d90e38e 100644
--- a/target/tilegx/cpu.c
+++ b/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)
diff --git a/target/tilegx/cpu.h b/target/tilegx/cpu.h
index 1735427..f32be49 100644
--- a/target/tilegx/cpu.h
+++ b/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;
 
diff --git a/target/tricore/cpu.c b/target/tricore/cpu.c
index 785b76b..08f50e2 100644
--- a/target/tricore/cpu.c
+++ b/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);
 }