accel/kvm: Turn DPRINTF macro use into tracepoints

Patch removes DPRINTF macro and adds multiple tracepoints
to capture different kvm events.

We also drop the DPRINTFs that don't add any additional
information than trace_kvm_run_exit already does.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1827

Signed-off-by: Jai Arora <arorajai2798@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

accel/kvm/kvm-all.c

@@ -69,16 +69,6 @@
 #define KVM_GUESTDBG_BLOCKIRQ 0
 #endif
 
-//#define DEBUG_KVM
-
-#ifdef DEBUG_KVM
-#define DPRINTF(fmt, ...) \
-    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
-    do { } while (0)
-#endif
-
 struct KVMParkedVcpu {
     unsigned long vcpu_id;
     int kvm_fd;
@@ -331,7 +321,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu)
     struct KVMParkedVcpu *vcpu = NULL;
     int ret = 0;
 
-    DPRINTF("kvm_destroy_vcpu\n");
+    trace_kvm_destroy_vcpu();
 
     ret = kvm_arch_destroy_vcpu(cpu);
     if (ret < 0) {
@@ -341,7 +331,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu)
     mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
     if (mmap_size < 0) {
         ret = mmap_size;
-        DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
+        trace_kvm_failed_get_vcpu_mmap_size();
         goto err;
     }
 
@@ -443,7 +433,6 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
                                    PAGE_SIZE * KVM_DIRTY_LOG_PAGE_OFFSET);
         if (cpu->kvm_dirty_gfns == MAP_FAILED) {
             ret = -errno;
-            DPRINTF("mmap'ing vcpu dirty gfns failed: %d\n", ret);
             goto err;
         }
     }
@@ -2821,7 +2810,7 @@ int kvm_cpu_exec(CPUState *cpu)
     struct kvm_run *run = cpu->kvm_run;
     int ret, run_ret;
 
-    DPRINTF("kvm_cpu_exec()\n");
+    trace_kvm_cpu_exec();
 
     if (kvm_arch_process_async_events(cpu)) {
         qatomic_set(&cpu->exit_request, 0);
@@ -2848,7 +2837,7 @@ int kvm_cpu_exec(CPUState *cpu)
 
         kvm_arch_pre_run(cpu, run);
         if (qatomic_read(&cpu->exit_request)) {
-            DPRINTF("interrupt exit requested\n");
+	    trace_kvm_interrupt_exit_request();
             /*
              * KVM requires us to reenter the kernel after IO exits to complete
              * instruction emulation. This self-signal will ensure that we
@@ -2878,7 +2867,7 @@ int kvm_cpu_exec(CPUState *cpu)
 
         if (run_ret < 0) {
             if (run_ret == -EINTR || run_ret == -EAGAIN) {
-                DPRINTF("io window exit\n");
+                trace_kvm_io_window_exit();
                 kvm_eat_signals(cpu);
                 ret = EXCP_INTERRUPT;
                 break;
@@ -2900,7 +2889,6 @@ int kvm_cpu_exec(CPUState *cpu)
         trace_kvm_run_exit(cpu->cpu_index, run->exit_reason);
         switch (run->exit_reason) {
         case KVM_EXIT_IO:
-            DPRINTF("handle_io\n");
             /* Called outside BQL */
             kvm_handle_io(run->io.port, attrs,
                           (uint8_t *)run + run->io.data_offset,
@@ -2910,7 +2898,6 @@ int kvm_cpu_exec(CPUState *cpu)
             ret = 0;
             break;
         case KVM_EXIT_MMIO:
-            DPRINTF("handle_mmio\n");
             /* Called outside BQL */
             address_space_rw(&address_space_memory,
                              run->mmio.phys_addr, attrs,
@@ -2920,11 +2907,9 @@ int kvm_cpu_exec(CPUState *cpu)
             ret = 0;
             break;
         case KVM_EXIT_IRQ_WINDOW_OPEN:
-            DPRINTF("irq_window_open\n");
             ret = EXCP_INTERRUPT;
             break;
         case KVM_EXIT_SHUTDOWN:
-            DPRINTF("shutdown\n");
             qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
             ret = EXCP_INTERRUPT;
             break;
@@ -2959,6 +2944,7 @@ int kvm_cpu_exec(CPUState *cpu)
             ret = 0;
             break;
         case KVM_EXIT_SYSTEM_EVENT:
+            trace_kvm_run_exit_system_event(cpu->cpu_index, run->system_event.type);
             switch (run->system_event.type) {
             case KVM_SYSTEM_EVENT_SHUTDOWN:
                 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
@@ -2976,13 +2962,11 @@ int kvm_cpu_exec(CPUState *cpu)
                 ret = 0;
                 break;
             default:
-                DPRINTF("kvm_arch_handle_exit\n");
                 ret = kvm_arch_handle_exit(cpu, run);
                 break;
             }
             break;
         default:
-            DPRINTF("kvm_arch_handle_exit\n");
             ret = kvm_arch_handle_exit(cpu, run);
             break;
         }

accel/kvm/trace-events

@@ -25,4 +25,9 @@ kvm_dirty_ring_reaper(const char *s) "%s"
 kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64" pages (took %"PRIi64" us)"
 kvm_dirty_ring_reaper_kick(const char *reason) "%s"
 kvm_dirty_ring_flush(int finished) "%d"
-
+kvm_destroy_vcpu(void) ""
+kvm_failed_get_vcpu_mmap_size(void) ""
+kvm_cpu_exec(void) ""
+kvm_interrupt_exit_request(void) ""
+kvm_io_window_exit(void) ""
+kvm_run_exit_system_event(int cpu_index, uint32_t event_type) "cpu_index %d, system_even_type %"PRIu32