accel/tcg: Restrict TCGCPUOps::tlb_fill() to sysemu

We have replaced tlb_fill with record_sigsegv for user mode.
Move the declaration to restrict it to system emulation.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/hw/core/tcg-cpu-ops.h

@@ -35,18 +35,6 @@ struct TCGCPUOps {
     void (*cpu_exec_enter)(CPUState *cpu);
     /** @cpu_exec_exit: Callback for cpu_exec cleanup */
     void (*cpu_exec_exit)(CPUState *cpu);
-    /**
-     * @tlb_fill: Handle a softmmu tlb miss or user-only address fault
-     *
-     * For system mode, if the access is valid, call tlb_set_page
-     * and return true; if the access is invalid, and probe is
-     * true, return false; otherwise raise an exception and do
-     * not return.  For user-only mode, always raise an exception
-     * and do not return.
-     */
-    bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
-                     MMUAccessType access_type, int mmu_idx,
-                     bool probe, uintptr_t retaddr);
     /** @debug_excp_handler: Callback for handling debug exceptions */
     void (*debug_excp_handler)(CPUState *cpu);
 
@@ -68,6 +56,16 @@ struct TCGCPUOps {
 #ifdef CONFIG_SOFTMMU
     /** @cpu_exec_interrupt: Callback for processing interrupts in cpu_exec */
     bool (*cpu_exec_interrupt)(CPUState *cpu, int interrupt_request);
+    /**
+     * @tlb_fill: Handle a softmmu tlb miss
+     *
+     * If the access is valid, call tlb_set_page and return true;
+     * if the access is invalid and probe is true, return false;
+     * otherwise raise an exception and do not return.
+     */
+    bool (*tlb_fill)(CPUState *cpu, vaddr address, int size,
+                     MMUAccessType access_type, int mmu_idx,
+                     bool probe, uintptr_t retaddr);
     /**
      * @do_transaction_failed: Callback for handling failed memory transactions
      * (ie bus faults or external aborts; not MMU faults)

linux-user/signal.c

@@ -697,9 +697,6 @@ void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
 
     if (tcg_ops->record_sigsegv) {
         tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra);
-    } else if (tcg_ops->tlb_fill) {
-        tcg_ops->tlb_fill(cpu, addr, 0, access_type, MMU_USER_IDX, false, ra);
-        g_assert_not_reached();
     }
 
     force_sig_fault(TARGET_SIGSEGV,