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

   1 /*
   2  * QEMU Windows Hypervisor Platform accelerator (WHPX)
   3  *
   4  * Copyright Microsoft Corp. 2017
   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
  11 #include "qemu/osdep.h"
  12 #include "sysemu/kvm_int.h"
  13 #include "qemu/main-loop.h"
  14 #include "sysemu/cpus.h"
  15 #include "qemu/guest-random.h"
  16
  17 #include "sysemu/whpx.h"
  18 #include "whpx-internal.h"
  19 #include "whpx-accel-ops.h"
  20
  21 static void *whpx_cpu_thread_fn(void *arg)
  22 {
  23     CPUState *cpu = arg;
  24     int r;
  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 = whpx_init_vcpu(cpu);
  34     if (r < 0) {
  35         fprintf(stderr, "whpx_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 = whpx_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     whpx_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 whpx_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/WHPX",
  71              cpu->cpu_index);
  72     qemu_thread_create(cpu->thread, thread_name, whpx_cpu_thread_fn,
  73                        cpu, QEMU_THREAD_JOINABLE);
  74 }
  75
  76 static void whpx_kick_vcpu_thread(CPUState *cpu)
  77 {
  78     if (!qemu_cpu_is_self(cpu)) {
  79         whpx_vcpu_kick(cpu);
  80     }
  81 }
  82
  83 static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
  84 {
  85     return !whpx_apic_in_platform();
  86 }
  87
  88 static void whpx_accel_ops_class_init(ObjectClass *oc, void *data)
  89 {
  90     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  91
  92     ops->create_vcpu_thread = whpx_start_vcpu_thread;
  93     ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
  94     ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
  95
  96     ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
  97     ops->synchronize_post_init = whpx_cpu_synchronize_post_init;
  98     ops->synchronize_state = whpx_cpu_synchronize_state;
  99     ops->synchronize_pre_loadvm = whpx_cpu_synchronize_pre_loadvm;
 100     ops->synchronize_pre_resume = whpx_cpu_synchronize_pre_resume;
 101 }
 102
 103 static const TypeInfo whpx_accel_ops_type = {
 104     .name = ACCEL_OPS_NAME("whpx"),
 105
 106     .parent = TYPE_ACCEL_OPS,
 107     .class_init = whpx_accel_ops_class_init,
 108     .abstract = true,
 109 };
 110
 111 static void whpx_accel_ops_register_types(void)
 112 {
 113     type_register_static(&whpx_accel_ops_type);
 114 }
 115 type_init(whpx_accel_ops_register_types);