target/i386/nvmm/nvmm-accel-ops.c

   1 /*
   2  * Copyright (c) 2018-2019 Maxime Villard, All rights reserved.
   3  *
   4  * NetBSD Virtual Machine Monitor (NVMM) accelerator for QEMU.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "sysemu/kvm_int.h"
  12 #include "qemu/main-loop.h"
  13 #include "sysemu/cpus.h"
  14 #include "qemu/guest-random.h"
  15
  16 #include "sysemu/nvmm.h"
  17 #include "nvmm-accel-ops.h"
  18
  19 static void *qemu_nvmm_cpu_thread_fn(void *arg)
  20 {
  21     CPUState *cpu = arg;
  22     int r;
  23
  24     assert(nvmm_enabled());
  25
  26     rcu_register_thread();
  27
  28     qemu_mutex_lock_iothread();
  29     qemu_thread_get_self(cpu->thread);
  30     cpu->thread_id = qemu_get_thread_id();
  31     current_cpu = cpu;
  32
  33     r = nvmm_init_vcpu(cpu);
  34     if (r < 0) {
  35         fprintf(stderr, "nvmm_init_vcpu failed: %s\n", strerror(-r));
  36         exit(1);
  37     }
  38
  39     /* signal CPU creation */
  40     cpu_thread_signal_created(cpu);
  41     qemu_guest_random_seed_thread_part2(cpu->random_seed);
  42
  43     do {
  44         if (cpu_can_run(cpu)) {
  45             r = nvmm_vcpu_exec(cpu);
  46             if (r == EXCP_DEBUG) {
  47                 cpu_handle_guest_debug(cpu);
  48             }
  49         }
  50         while (cpu_thread_is_idle(cpu)) {
  51             qemu_cond_wait_iothread(cpu->halt_cond);
  52         }
  53         qemu_wait_io_event_common(cpu);
  54     } while (!cpu->unplug || cpu_can_run(cpu));
  55
  56     nvmm_destroy_vcpu(cpu);
  57     cpu_thread_signal_destroyed(cpu);
  58     qemu_mutex_unlock_iothread();
  59     rcu_unregister_thread();
  60     return NULL;
  61 }
  62
  63 static void nvmm_start_vcpu_thread(CPUState *cpu)
  64 {
  65     char thread_name[VCPU_THREAD_NAME_SIZE];
  66
  67     cpu->thread = g_new0(QemuThread, 1);
  68     cpu->halt_cond = g_new0(QemuCond, 1);
  69     qemu_cond_init(cpu->halt_cond);
  70     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM",
  71              cpu->cpu_index);
  72     qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn,
  73                        cpu, QEMU_THREAD_JOINABLE);
  74 }
  75
  76 /*
  77  * Abort the call to run the virtual processor by another thread, and to
  78  * return the control to that thread.
  79  */
  80 static void nvmm_kick_vcpu_thread(CPUState *cpu)
  81 {
  82     cpu->exit_request = 1;
  83     cpus_kick_thread(cpu);
  84 }
  85
  86 static void nvmm_accel_ops_class_init(ObjectClass *oc, void *data)
  87 {
  88     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  89
  90     ops->create_vcpu_thread = nvmm_start_vcpu_thread;
  91     ops->kick_vcpu_thread = nvmm_kick_vcpu_thread;
  92
  93     ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset;
  94     ops->synchronize_post_init = nvmm_cpu_synchronize_post_init;
  95     ops->synchronize_state = nvmm_cpu_synchronize_state;
  96     ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm;
  97 }
  98
  99 static const TypeInfo nvmm_accel_ops_type = {
 100     .name = ACCEL_OPS_NAME("nvmm"),
 101
 102     .parent = TYPE_ACCEL_OPS,
 103     .class_init = nvmm_accel_ops_class_init,
 104     .abstract = true,
 105 };
 106
 107 static void nvmm_accel_ops_register_types(void)
 108 {
 109     type_register_static(&nvmm_accel_ops_type);
 110 }
 111 type_init(nvmm_accel_ops_register_types);