qemu

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nvmm-accel-ops.c (3006B)

      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);