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accel/kvm: Turn DPRINTF macro use into tracepoints
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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>
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jaiiarora authored and Michael Tokarev committed Dec 23, 2023
1 parent 8a8be21 commit 9cdfb1e
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Showing 2 changed files with 12 additions and 23 deletions.
28 changes: 6 additions & 22 deletions accel/kvm/kvm-all.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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) {
Expand All @@ -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;
}

Expand Down Expand Up @@ -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;
}
}
Expand Down Expand Up @@ -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);
Expand All @@ -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
Expand Down Expand Up @@ -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;
Expand All @@ -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,
Expand All @@ -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,
Expand All @@ -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;
Expand Down Expand Up @@ -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);
Expand All @@ -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;
}
Expand Down
7 changes: 6 additions & 1 deletion accel/kvm/trace-events
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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

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