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     bql_lock();
  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_bql(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     bql_unlock();
  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     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX",
  68              cpu->cpu_index);
  69     qemu_thread_create(cpu->thread, thread_name, whpx_cpu_thread_fn,
  70                        cpu, QEMU_THREAD_JOINABLE);
  71 }
  72
  73 static void whpx_kick_vcpu_thread(CPUState *cpu)
  74 {
  75     if (!qemu_cpu_is_self(cpu)) {
  76         whpx_vcpu_kick(cpu);
  77     }
  78 }
  79
  80 static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
  81 {
  82     return !whpx_apic_in_platform();
  83 }
  84
  85 static void whpx_accel_ops_class_init(ObjectClass *oc, void *data)
  86 {
  87     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  88
  89     ops->create_vcpu_thread = whpx_start_vcpu_thread;
  90     ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
  91     ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
  92
  93     ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
  94     ops->synchronize_post_init = whpx_cpu_synchronize_post_init;
  95     ops->synchronize_state = whpx_cpu_synchronize_state;
  96     ops->synchronize_pre_loadvm = whpx_cpu_synchronize_pre_loadvm;
  97     ops->synchronize_pre_resume = whpx_cpu_synchronize_pre_resume;
  98 }
  99
 100 static const TypeInfo whpx_accel_ops_type = {
 101     .name = ACCEL_OPS_NAME("whpx"),
 102
 103     .parent = TYPE_ACCEL_OPS,
 104     .class_init = whpx_accel_ops_class_init,
 105     .abstract = true,
 106 };
 107
 108 static void whpx_accel_ops_register_types(void)
 109 {
 110     type_register_static(&whpx_accel_ops_type);
 111 }
 112 type_init(whpx_accel_ops_register_types);