tcg: Introduce tcg_max_ctxs

Finish the divorce of tcg/ from hw/, and do not take
the max cpu value from MachineState; just remember what
we were passed in tcg_init.

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/region.c

@@ -347,7 +347,7 @@ void tcg_region_initial_alloc(TCGContext *s)
 /* Call from a safe-work context */
 void tcg_region_reset_all(void)
 {
-    unsigned int n_ctxs = qatomic_read(&n_tcg_ctxs);
+    unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
     unsigned int i;
 
     qemu_mutex_lock(&region.lock);
@@ -934,7 +934,7 @@ void tcg_region_prologue_set(TCGContext *s)
  */
 size_t tcg_code_size(void)
 {
-    unsigned int n_ctxs = qatomic_read(&n_tcg_ctxs);
+    unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
     unsigned int i;
     size_t total;
 
@@ -970,7 +970,7 @@ size_t tcg_code_capacity(void)
 
 size_t tcg_tb_phys_invalidate_count(void)
 {
-    unsigned int n_ctxs = qatomic_read(&n_tcg_ctxs);
+    unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
     unsigned int i;
     size_t total = 0;
 

tcg/tcg-internal.h

@@ -28,7 +28,8 @@
 #define TCG_HIGHWATER 1024
 
 extern TCGContext **tcg_ctxs;
-extern unsigned int n_tcg_ctxs;
+extern unsigned int tcg_cur_ctxs;
+extern unsigned int tcg_max_ctxs;
 
 void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus);
 bool tcg_region_alloc(TCGContext *s);

tcg/tcg.c

@@ -43,11 +43,6 @@
 #define NO_CPU_IO_DEFS
 
 #include "exec/exec-all.h"
-
-#if !defined(CONFIG_USER_ONLY)
-#include "hw/boards.h"
-#endif
-
 #include "tcg/tcg-op.h"
 
 #if UINTPTR_MAX == UINT32_MAX
@@ -155,7 +150,8 @@ static int tcg_out_ldst_finalize(TCGContext *s);
 #endif
 
 TCGContext **tcg_ctxs;
-unsigned int n_tcg_ctxs;
+unsigned int tcg_cur_ctxs;
+unsigned int tcg_max_ctxs;
 TCGv_env cpu_env = 0;
 const void *tcg_code_gen_epilogue;
 uintptr_t tcg_splitwx_diff;
@@ -475,7 +471,6 @@ void tcg_register_thread(void)
 #else
 void tcg_register_thread(void)
 {
-    MachineState *ms = MACHINE(qdev_get_machine());
     TCGContext *s = g_malloc(sizeof(*s));
     unsigned int i, n;
 
@@ -491,8 +486,8 @@ void tcg_register_thread(void)
     }
 
     /* Claim an entry in tcg_ctxs */
-    n = qatomic_fetch_inc(&n_tcg_ctxs);
-    g_assert(n < ms->smp.max_cpus);
+    n = qatomic_fetch_inc(&tcg_cur_ctxs);
+    g_assert(n < tcg_max_ctxs);
     qatomic_set(&tcg_ctxs[n], s);
 
     if (n > 0) {
@@ -643,9 +638,11 @@ static void tcg_context_init(unsigned max_cpus)
      */
 #ifdef CONFIG_USER_ONLY
     tcg_ctxs = &tcg_ctx;
-    n_tcg_ctxs = 1;
+    tcg_cur_ctxs = 1;
+    tcg_max_ctxs = 1;
 #else
-    tcg_ctxs = g_new(TCGContext *, max_cpus);
+    tcg_max_ctxs = max_cpus;
+    tcg_ctxs = g_new0(TCGContext *, max_cpus);
 #endif
 
     tcg_debug_assert(!tcg_regset_test_reg(s->reserved_regs, TCG_AREG0));
@@ -3937,7 +3934,7 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
 static inline
 void tcg_profile_snapshot(TCGProfile *prof, bool counters, bool table)
 {
-    unsigned int n_ctxs = qatomic_read(&n_tcg_ctxs);
+    unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
     unsigned int i;
 
     for (i = 0; i < n_ctxs; i++) {
@@ -4000,7 +3997,7 @@ void tcg_dump_op_count(void)
 
 int64_t tcg_cpu_exec_time(void)
 {
-    unsigned int n_ctxs = qatomic_read(&n_tcg_ctxs);
+    unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
     unsigned int i;
     int64_t ret = 0;