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); 112