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/*
* Copyright (c) 2018-2019 Maxime Villard, All rights reserved.
*
* NetBSD Virtual Machine Monitor (NVMM) accelerator for QEMU.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "sysemu/kvm_int.h"
#include "qemu/main-loop.h"
#include "sysemu/cpus.h"
#include "qemu/guest-random.h"
#include "sysemu/nvmm.h"
#include "nvmm-accel-ops.h"
static void *qemu_nvmm_cpu_thread_fn(void *arg)
{
CPUState *cpu = arg;
int r;
assert(nvmm_enabled());
rcu_register_thread();
qemu_mutex_lock_iothread();
qemu_thread_get_self(cpu->thread);
cpu->thread_id = qemu_get_thread_id();
current_cpu = cpu;
r = nvmm_init_vcpu(cpu);
if (r < 0) {
fprintf(stderr, "nvmm_init_vcpu failed: %s\n", strerror(-r));
exit(1);
}
/* signal CPU creation */
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
if (cpu_can_run(cpu)) {
r = nvmm_vcpu_exec(cpu);
if (r == EXCP_DEBUG) {
cpu_handle_guest_debug(cpu);
}
}
while (cpu_thread_is_idle(cpu)) {
qemu_cond_wait_iothread(cpu->halt_cond);
}
qemu_wait_io_event_common(cpu);
} while (!cpu->unplug || cpu_can_run(cpu));
nvmm_destroy_vcpu(cpu);
cpu_thread_signal_destroyed(cpu);
qemu_mutex_unlock_iothread();
rcu_unregister_thread();
return NULL;
}
static void nvmm_start_vcpu_thread(CPUState *cpu)
{
char thread_name[VCPU_THREAD_NAME_SIZE];
cpu->thread = g_new0(QemuThread, 1);
cpu->halt_cond = g_new0(QemuCond, 1);
qemu_cond_init(cpu->halt_cond);
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM",
cpu->cpu_index);
qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn,
cpu, QEMU_THREAD_JOINABLE);
}
/*
* Abort the call to run the virtual processor by another thread, and to
* return the control to that thread.
*/
static void nvmm_kick_vcpu_thread(CPUState *cpu)
{
cpu->exit_request = 1;
cpus_kick_thread(cpu);
}
static void nvmm_accel_ops_class_init(ObjectClass *oc, void *data)
{
AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
ops->create_vcpu_thread = nvmm_start_vcpu_thread;
ops->kick_vcpu_thread = nvmm_kick_vcpu_thread;
ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset;
ops->synchronize_post_init = nvmm_cpu_synchronize_post_init;
ops->synchronize_state = nvmm_cpu_synchronize_state;
ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm;
}
static const TypeInfo nvmm_accel_ops_type = {
.name = ACCEL_OPS_NAME("nvmm"),
.parent = TYPE_ACCEL_OPS,
.class_init = nvmm_accel_ops_class_init,
.abstract = true,
};
static void nvmm_accel_ops_register_types(void)
{
type_register_static(&nvmm_accel_ops_type);
}
type_init(nvmm_accel_ops_register_types);
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