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cpus: prepare new CpusAccel cpu accelerator interface

Browse Source 
The new interface starts unused, will start being used by the
next patches.

It provides methods for each accelerator to start a vcpu, kick a vcpu,
synchronize state, get cpu virtual clock and elapsed ticks.

In qemu_wait_io_event, make it clear that APC is used only for HAX
on Windows.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Fontana 2020-07-31 12:23:42 +02:00 committed by Paolo Bonzini
parent 8191d36841
commit 430065dab0
11 changed files with 225 additions and 123 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
hw/core/cpu.c
View File

@ -33,6 +33,7 @@
#include "hw/qdev-properties.h"
#include "trace/trace-root.h"
#include "qemu/plugin.h"
#include "sysemu/hw_accel.h"
CPUInterruptHandler cpu_interrupt_handler;

2
hw/i386/x86.c
View File

@ -522,7 +522,7 @@ static long get_file_size(FILE *f)
/* TSC handling */
uint64_t cpu_get_tsc(CPUX86State *env)
{
return cpu_get_ticks();
return cpus_get_elapsed_ticks();
}
/* IRQ handling */

9
include/sysemu/cpu-timers.h
View File

@ -70,9 +70,8 @@ void cpu_enable_ticks(void);
void cpu_disable_ticks(void);
/*
* return the time elapsed in VM between vm_start and vm_stop. Unless
* icount is active, cpu_get_ticks() uses units of the host CPU cycle
* counter.
* return the time elapsed in VM between vm_start and vm_stop.
* cpu_get_ticks() uses units of the host CPU cycle counter.
*/
int64_t cpu_get_ticks(void);
@ -84,4 +83,8 @@ int64_t cpu_get_clock(void);
void qemu_timer_notify_cb(void *opaque, QEMUClockType type);
/* get the VIRTUAL clock and VM elapsed ticks via the cpus accel interface */
int64_t cpus_get_virtual_clock(void);
int64_t cpus_get_elapsed_ticks(void);
#endif /* SYSEMU_CPU_TIMERS_H */

36
include/sysemu/cpus.h
View File

@ -4,7 +4,43 @@
#include "qemu/timer.h"
/* cpus.c */
/* CPU execution threads */
typedef struct CpusAccel {
void (*create_vcpu_thread)(CPUState *cpu); /* MANDATORY */
void (*kick_vcpu_thread)(CPUState *cpu);
void (*synchronize_post_reset)(CPUState *cpu);
void (*synchronize_post_init)(CPUState *cpu);
void (*synchronize_state)(CPUState *cpu);
void (*synchronize_pre_loadvm)(CPUState *cpu);
int64_t (*get_virtual_clock)(void);
int64_t (*get_elapsed_ticks)(void);
} CpusAccel;
/* register accel-specific cpus interface implementation */
void cpus_register_accel(const CpusAccel *i);
/* interface available for cpus accelerator threads */
/* For temporary buffers for forming a name */
#define VCPU_THREAD_NAME_SIZE 16
void cpus_kick_thread(CPUState *cpu);
bool cpu_work_list_empty(CPUState *cpu);
bool cpu_thread_is_idle(CPUState *cpu);
bool all_cpu_threads_idle(void);
bool cpu_can_run(CPUState *cpu);
void qemu_wait_io_event_common(CPUState *cpu);
void qemu_wait_io_event(CPUState *cpu);
void cpu_thread_signal_created(CPUState *cpu);
void cpu_thread_signal_destroyed(CPUState *cpu);
void cpu_handle_guest_debug(CPUState *cpu);
/* end interface for cpus accelerator threads */
bool qemu_in_vcpu_thread(void);
void qemu_init_cpu_loop(void);
void resume_all_vcpus(void);

69
include/sysemu/hw_accel.h
View File

@ -1,5 +1,5 @@
/*
* QEMU Hardware accelertors support
* QEMU Hardware accelerators support
*
* Copyright 2016 Google, Inc.
*
@ -17,68 +17,9 @@
#include "sysemu/hvf.h"
#include "sysemu/whpx.h"
static inline void cpu_synchronize_state(CPUState *cpu)
{
if (kvm_enabled()) {
kvm_cpu_synchronize_state(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_state(cpu);
}
if (hvf_enabled()) {
hvf_cpu_synchronize_state(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_state(cpu);
}
}
static inline void cpu_synchronize_post_reset(CPUState *cpu)
{
if (kvm_enabled()) {
kvm_cpu_synchronize_post_reset(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_post_reset(cpu);
}
if (hvf_enabled()) {
hvf_cpu_synchronize_post_reset(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_post_reset(cpu);
}
}
static inline void cpu_synchronize_post_init(CPUState *cpu)
{
if (kvm_enabled()) {
kvm_cpu_synchronize_post_init(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_post_init(cpu);
}
if (hvf_enabled()) {
hvf_cpu_synchronize_post_init(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_post_init(cpu);
}
}
static inline void cpu_synchronize_pre_loadvm(CPUState *cpu)
{
if (kvm_enabled()) {
kvm_cpu_synchronize_pre_loadvm(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_pre_loadvm(cpu);
}
if (hvf_enabled()) {
hvf_cpu_synchronize_pre_loadvm(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_pre_loadvm(cpu);
}
}
void cpu_synchronize_state(CPUState *cpu);
void cpu_synchronize_post_reset(CPUState *cpu);
void cpu_synchronize_post_init(CPUState *cpu);
void cpu_synchronize_pre_loadvm(CPUState *cpu);
#endif /* QEMU_HW_ACCEL_H */

9
softmmu/cpu-timers.c
View File

@ -61,18 +61,13 @@ static int64_t cpu_get_ticks_locked(void)
}
/*
* return the time elapsed in VM between vm_start and vm_stop. Unless
* icount is active, cpu_get_ticks() uses units of the host CPU cycle
* counter.
* return the time elapsed in VM between vm_start and vm_stop.
* cpu_get_ticks() uses units of the host CPU cycle counter.
*/
int64_t cpu_get_ticks(void)
{
int64_t ticks;
if (icount_enabled()) {
return icount_get();
}
qemu_spin_lock(&timers_state.vm_clock_lock);
ticks = cpu_get_ticks_locked();
qemu_spin_unlock(&timers_state.vm_clock_lock);

195
softmmu/cpus.c
View File

@ -87,7 +87,7 @@ bool cpu_is_stopped(CPUState *cpu)
return cpu->stopped || !runstate_is_running();
}
static inline bool cpu_work_list_empty(CPUState *cpu)
bool cpu_work_list_empty(CPUState *cpu)
{
bool ret;
@ -97,7 +97,7 @@ static inline bool cpu_work_list_empty(CPUState *cpu)
return ret;
}
static bool cpu_thread_is_idle(CPUState *cpu)
bool cpu_thread_is_idle(CPUState *cpu)
{
if (cpu->stop || !cpu_work_list_empty(cpu)) {
return false;
@ -215,6 +215,11 @@ void hw_error(const char *fmt, ...)
abort();
}
/*
* The chosen accelerator is supposed to register this.
*/
static const CpusAccel *cpus_accel;
void cpu_synchronize_all_states(void)
{
CPUState *cpu;
@ -251,6 +256,102 @@ void cpu_synchronize_all_pre_loadvm(void)
}
}
void cpu_synchronize_state(CPUState *cpu)
{
if (cpus_accel && cpus_accel->synchronize_state) {
cpus_accel->synchronize_state(cpu);
}
if (kvm_enabled()) {
kvm_cpu_synchronize_state(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_state(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_state(cpu);
}
}
void cpu_synchronize_post_reset(CPUState *cpu)
{
if (cpus_accel && cpus_accel->synchronize_post_reset) {
cpus_accel->synchronize_post_reset(cpu);
}
if (kvm_enabled()) {
kvm_cpu_synchronize_post_reset(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_post_reset(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_post_reset(cpu);
}
}
void cpu_synchronize_post_init(CPUState *cpu)
{
if (cpus_accel && cpus_accel->synchronize_post_init) {
cpus_accel->synchronize_post_init(cpu);
}
if (kvm_enabled()) {
kvm_cpu_synchronize_post_init(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_post_init(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_post_init(cpu);
}
}
void cpu_synchronize_pre_loadvm(CPUState *cpu)
{
if (cpus_accel && cpus_accel->synchronize_pre_loadvm) {
cpus_accel->synchronize_pre_loadvm(cpu);
}
if (kvm_enabled()) {
kvm_cpu_synchronize_pre_loadvm(cpu);
}
if (hax_enabled()) {
hax_cpu_synchronize_pre_loadvm(cpu);
}
if (hvf_enabled()) {
hvf_cpu_synchronize_pre_loadvm(cpu);
}
if (whpx_enabled()) {
whpx_cpu_synchronize_pre_loadvm(cpu);
}
}
int64_t cpus_get_virtual_clock(void)
{
if (cpus_accel && cpus_accel->get_virtual_clock) {
return cpus_accel->get_virtual_clock();
}
if (icount_enabled()) {
return icount_get();
} else if (qtest_enabled()) { /* for qtest_clock_warp */
return qtest_get_virtual_clock();
}
return cpu_get_clock();
}
/*
* return the time elapsed in VM between vm_start and vm_stop. Unless
* icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle
* counter.
*/
int64_t cpus_get_elapsed_ticks(void)
{
if (cpus_accel && cpus_accel->get_elapsed_ticks) {
return cpus_accel->get_elapsed_ticks();
}
if (icount_enabled()) {
return icount_get();
}
return cpu_get_ticks();
}
static int do_vm_stop(RunState state, bool send_stop)
{
int ret = 0;
@ -279,7 +380,7 @@ int vm_shutdown(void)
return do_vm_stop(RUN_STATE_SHUTDOWN, false);
}
static bool cpu_can_run(CPUState *cpu)
bool cpu_can_run(CPUState *cpu)
{
if (cpu->stop) {
return false;
@ -290,7 +391,7 @@ static bool cpu_can_run(CPUState *cpu)
return true;
}
static void cpu_handle_guest_debug(CPUState *cpu)
void cpu_handle_guest_debug(CPUState *cpu)
{
gdb_set_stop_cpu(cpu);
qemu_system_debug_request();
@ -396,7 +497,7 @@ static void qemu_cpu_stop(CPUState *cpu, bool exit)
qemu_cond_broadcast(&qemu_pause_cond);
}
static void qemu_wait_io_event_common(CPUState *cpu)
void qemu_wait_io_event_common(CPUState *cpu)
{
qatomic_mb_set(&cpu->thread_kicked, false);
if (cpu->stop) {
@ -421,7 +522,7 @@ static void qemu_tcg_rr_wait_io_event(void)
}
}
static void qemu_wait_io_event(CPUState *cpu)
void qemu_wait_io_event(CPUState *cpu)
{
bool slept = false;
@ -437,8 +538,8 @@ static void qemu_wait_io_event(CPUState *cpu)
}
#ifdef _WIN32
/* Eat dummy APC queued by qemu_cpu_kick_thread. */
if (!tcg_enabled()) {
/* Eat dummy APC queued by cpus_kick_thread. */
if (hax_enabled()) {
SleepEx(0, TRUE);
}
#endif
@ -467,8 +568,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
kvm_init_cpu_signals(cpu);
/* signal CPU creation */
cpu->created = true;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
@ -482,8 +582,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
} while (!cpu->unplug || cpu_can_run(cpu));
qemu_kvm_destroy_vcpu(cpu);
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_destroyed(cpu);
qemu_mutex_unlock_iothread();
rcu_unregister_thread();
return NULL;
@ -511,8 +610,7 @@ static void *qemu_dummy_cpu_thread_fn(void *arg)
sigaddset(&waitset, SIG_IPI);
/* signal CPU creation */
cpu->created = true;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
@ -660,8 +758,7 @@ static void deal_with_unplugged_cpus(void)
CPU_FOREACH(cpu) {
if (cpu->unplug && !cpu_can_run(cpu)) {
qemu_tcg_destroy_vcpu(cpu);
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_destroyed(cpu);
break;
}
}
@ -688,9 +785,8 @@ static void *qemu_tcg_rr_cpu_thread_fn(void *arg)
qemu_thread_get_self(cpu->thread);
cpu->thread_id = qemu_get_thread_id();
cpu->created = true;
cpu->can_do_io = 1;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
/* wait for initial kick-off after machine start */
@ -800,11 +896,9 @@ static void *qemu_hax_cpu_thread_fn(void *arg)
qemu_thread_get_self(cpu->thread);
cpu->thread_id = qemu_get_thread_id();
cpu->created = true;
current_cpu = cpu;
hax_init_vcpu(cpu);
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
@ -843,8 +937,7 @@ static void *qemu_hvf_cpu_thread_fn(void *arg)
hvf_init_vcpu(cpu);
/* signal CPU creation */
cpu->created = true;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
@ -858,8 +951,7 @@ static void *qemu_hvf_cpu_thread_fn(void *arg)
} while (!cpu->unplug || cpu_can_run(cpu));
hvf_vcpu_destroy(cpu);
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_destroyed(cpu);
qemu_mutex_unlock_iothread();
rcu_unregister_thread();
return NULL;
@ -884,8 +976,7 @@ static void *qemu_whpx_cpu_thread_fn(void *arg)
}
/* signal CPU creation */
cpu->created = true;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
@ -902,8 +993,7 @@ static void *qemu_whpx_cpu_thread_fn(void *arg)
} while (!cpu->unplug || cpu_can_run(cpu));
whpx_destroy_vcpu(cpu);
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_destroyed(cpu);
qemu_mutex_unlock_iothread();
rcu_unregister_thread();
return NULL;
@ -936,10 +1026,9 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
qemu_thread_get_self(cpu->thread);
cpu->thread_id = qemu_get_thread_id();
cpu->created = true;
cpu->can_do_io = 1;
current_cpu = cpu;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
/* process any pending work */
@ -980,14 +1069,13 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
} while (!cpu->unplug || cpu_can_run(cpu));
qemu_tcg_destroy_vcpu(cpu);
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
cpu_thread_signal_destroyed(cpu);
qemu_mutex_unlock_iothread();
rcu_unregister_thread();
return NULL;
}
static void qemu_cpu_kick_thread(CPUState *cpu)
void cpus_kick_thread(CPUState *cpu)
{
#ifndef _WIN32
int err;
@ -1017,7 +1105,10 @@ static void qemu_cpu_kick_thread(CPUState *cpu)
void qemu_cpu_kick(CPUState *cpu)
{
qemu_cond_broadcast(cpu->halt_cond);
if (tcg_enabled()) {
if (cpus_accel && cpus_accel->kick_vcpu_thread) {
cpus_accel->kick_vcpu_thread(cpu);
} else if (tcg_enabled()) {
if (qemu_tcg_mttcg_enabled()) {
cpu_exit(cpu);
} else {
@ -1031,14 +1122,14 @@ void qemu_cpu_kick(CPUState *cpu)
*/
cpu->exit_request = 1;
}
qemu_cpu_kick_thread(cpu);
cpus_kick_thread(cpu);
}
}
void qemu_cpu_kick_self(void)
{
assert(current_cpu);
qemu_cpu_kick_thread(current_cpu);
cpus_kick_thread(current_cpu);
}
bool qemu_cpu_is_self(CPUState *cpu)
@ -1088,6 +1179,21 @@ void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
}
/* signal CPU creation */
void cpu_thread_signal_created(CPUState *cpu)
{
cpu->created = true;
qemu_cond_signal(&qemu_cpu_cond);
}
/* signal CPU destruction */
void cpu_thread_signal_destroyed(CPUState *cpu)
{
cpu->created = false;
qemu_cond_signal(&qemu_cpu_cond);
}
static bool all_vcpus_paused(void)
{
CPUState *cpu;
@ -1163,9 +1269,6 @@ void cpu_remove_sync(CPUState *cpu)
qemu_mutex_lock_iothread();
}
/* For temporary buffers for forming a name */
#define VCPU_THREAD_NAME_SIZE 16
static void qemu_tcg_init_vcpu(CPUState *cpu)
{
char thread_name[VCPU_THREAD_NAME_SIZE];
@ -1295,6 +1398,13 @@ static void qemu_whpx_start_vcpu(CPUState *cpu)
#endif
}
void cpus_register_accel(const CpusAccel *ca)
{
assert(ca != NULL);
assert(ca->create_vcpu_thread != NULL); /* mandatory */
cpus_accel = ca;
}
static void qemu_dummy_start_vcpu(CPUState *cpu)
{
char thread_name[VCPU_THREAD_NAME_SIZE];
@ -1325,7 +1435,10 @@ void qemu_init_vcpu(CPUState *cpu)
cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
}
if (kvm_enabled()) {
if (cpus_accel) {
/* accelerator already implements the CpusAccel interface */
cpus_accel->create_vcpu_thread(cpu);
} else if (kvm_enabled()) {
qemu_kvm_start_vcpu(cpu);
} else if (hax_enabled()) {
qemu_hax_start_vcpu(cpu);

9
stubs/cpu-synchronize-state.c Normal file
View File

@ -0,0 +1,9 @@
#include "qemu/osdep.h"
#include "sysemu/hw_accel.h"
void cpu_synchronize_state(CPUState *cpu)
{
}
void cpu_synchronize_post_init(CPUState *cpu)
{
}

8
stubs/cpus-get-virtual-clock.c Normal file
View File

@ -0,0 +1,8 @@
#include "qemu/osdep.h"
#include "sysemu/cpu-timers.h"
#include "qemu/main-loop.h"
int64_t cpus_get_virtual_clock(void)
{
return cpu_get_clock();
}

2
stubs/meson.build
View File

@ -5,6 +5,7 @@ stub_ss.add(files('blockdev-close-all-bdrv-states.c'))
stub_ss.add(files('change-state-handler.c'))
stub_ss.add(files('cmos.c'))
stub_ss.add(files('cpu-get-clock.c'))
stub_ss.add(files('cpus-get-virtual-clock.c'))
stub_ss.add(files('qemu-timer-notify-cb.c'))
stub_ss.add(files('icount.c'))
stub_ss.add(files('dump.c'))
@ -44,6 +45,7 @@ stub_ss.add(files('vmgenid.c'))
stub_ss.add(files('vmstate.c'))
stub_ss.add(files('vm-stop.c'))
stub_ss.add(files('win32-kbd-hook.c'))
stub_ss.add(files('cpu-synchronize-state.c'))
if have_system
stub_ss.add(files('semihost.c'))
stub_ss.add(files('xen-hw-stub.c'))

8
util/qemu-timer.c
View File

@ -635,13 +635,7 @@ int64_t qemu_clock_get_ns(QEMUClockType type)
return get_clock();
default:
case QEMU_CLOCK_VIRTUAL:
if (icount_enabled()) {
return icount_get();
} else if (qtest_enabled()) { /* for qtest_clock_warp */
return qtest_get_virtual_clock();
} else {
return cpu_get_clock();
}
return cpus_get_virtual_clock();
case QEMU_CLOCK_HOST:
return REPLAY_CLOCK(REPLAY_CLOCK_HOST, get_clock_realtime());
case QEMU_CLOCK_VIRTUAL_RT: