LXR qemu/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
  19static 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
  63static void nvmm_start_vcpu_thread(CPUState *cpu)
  64{
  65    char thread_name[VCPU_THREAD_NAME_SIZE];
  66
  67    cpu->thread = g_malloc0(sizeof(QemuThread));
  68    cpu->halt_cond = g_malloc0(sizeof(QemuCond));
  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 */
  80static void nvmm_kick_vcpu_thread(CPUState *cpu)
  81{
  82    cpu->exit_request = 1;
  83    cpus_kick_thread(cpu);
  84}
  85
  86static 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
  99static 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
 107static void nvmm_accel_ops_register_types(void)
 108{
 109    type_register_static(&nvmm_accel_ops_type);
 110}
 111type_init(nvmm_accel_ops_register_types);
 112