gdbstub: move update guest debug to accel ops

Continuing the refactor of a48e7d9e (gdbstub: move guest debug support
check to ops) by removing hardcoded kvm_enabled() from generic cpu.c
code, and replace it with a property of AccelOpsClass.

Signed-off-by: Mads Ynddal <m.ynddal@samsung.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230207131721.49233-1-mads@ynddal.dk>
[AJB: add ifdef around update_guest_debug_ops, fix brace]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-27-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-30-richard.henderson@linaro.org>

accel/kvm/kvm-accel-ops.c

@@ -86,6 +86,13 @@ static bool kvm_cpus_are_resettable(void)
     return !kvm_enabled() || kvm_cpu_check_are_resettable();
 }
 
+#ifdef KVM_CAP_SET_GUEST_DEBUG
+static int kvm_update_guest_debug_ops(CPUState *cpu)
+{
+    return kvm_update_guest_debug(cpu, 0);
+}
+#endif
+
 static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
 {
     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
@@ -99,6 +106,7 @@ static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
     ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
 
 #ifdef KVM_CAP_SET_GUEST_DEBUG
+    ops->update_guest_debug = kvm_update_guest_debug_ops;
     ops->supports_guest_debug = kvm_supports_guest_debug;
     ops->insert_breakpoint = kvm_insert_breakpoint;
     ops->remove_breakpoint = kvm_remove_breakpoint;

cpu.c

@@ -31,8 +31,8 @@
 #include "hw/core/sysemu-cpu-ops.h"
 #include "exec/address-spaces.h"
 #endif
+#include "sysemu/cpus.h"
 #include "sysemu/tcg.h"
-#include "sysemu/kvm.h"
 #include "exec/replay-core.h"
 #include "exec/cpu-common.h"
 #include "exec/exec-all.h"
@@ -326,9 +326,14 @@ void cpu_single_step(CPUState *cpu, int enabled)
 {
     if (cpu->singlestep_enabled != enabled) {
         cpu->singlestep_enabled = enabled;
-        if (kvm_enabled()) {
-            kvm_update_guest_debug(cpu, 0);
+
+#if !defined(CONFIG_USER_ONLY)
+        const AccelOpsClass *ops = cpus_get_accel();
+        if (ops->update_guest_debug) {
+            ops->update_guest_debug(cpu);
         }
+#endif
+
         trace_breakpoint_singlestep(cpu->cpu_index, enabled);
     }
 }

include/sysemu/accel-ops.h

@@ -48,6 +48,7 @@ struct AccelOpsClass {
 
     /* gdbstub hooks */
     bool (*supports_guest_debug)(void);
+    int (*update_guest_debug)(CPUState *cpu);
     int (*insert_breakpoint)(CPUState *cpu, int type, vaddr addr, vaddr len);
     int (*remove_breakpoint)(CPUState *cpu, int type, vaddr addr, vaddr len);
     void (*remove_all_breakpoints)(CPUState *cpu);