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 "system/kvm_int.h" 12 #include "qemu/main-loop.h" 13 #include "system/accel-ops.h" 14 #include "system/cpus.h" 15 #include "qemu/guest-random.h" 16 17 #include "system/nvmm.h" 18 #include "nvmm-accel-ops.h" 19 20 static void *qemu_nvmm_cpu_thread_fn(void *arg) 21 { 22 CPUState *cpu = arg; 23 int r; 24 25 assert(nvmm_enabled()); 26 27 rcu_register_thread(); 28 29 bql_lock(); 30 qemu_thread_get_self(cpu->thread); 31 cpu->thread_id = qemu_get_thread_id(); 32 current_cpu = cpu; 33 34 r = nvmm_init_vcpu(cpu); 35 if (r < 0) { 36 fprintf(stderr, "nvmm_init_vcpu failed: %s\n", strerror(-r)); 37 exit(1); 38 } 39 40 /* signal CPU creation */ 41 cpu_thread_signal_created(cpu); 42 qemu_guest_random_seed_thread_part2(cpu->random_seed); 43 44 do { 45 if (cpu_can_run(cpu)) { 46 r = nvmm_vcpu_exec(cpu); 47 if (r == EXCP_DEBUG) { 48 cpu_handle_guest_debug(cpu); 49 } 50 } 51 while (cpu_thread_is_idle(cpu)) { 52 qemu_cond_wait_bql(cpu->halt_cond); 53 } 54 qemu_wait_io_event_common(cpu); 55 } while (!cpu->unplug || cpu_can_run(cpu)); 56 57 nvmm_destroy_vcpu(cpu); 58 cpu_thread_signal_destroyed(cpu); 59 bql_unlock(); 60 rcu_unregister_thread(); 61 return NULL; 62 } 63 64 static void nvmm_start_vcpu_thread(CPUState *cpu) 65 { 66 char thread_name[VCPU_THREAD_NAME_SIZE]; 67 68 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM", 69 cpu->cpu_index); 70 qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn, 71 cpu, QEMU_THREAD_JOINABLE); 72 } 73 74 /* 75 * Abort the call to run the virtual processor by another thread, and to 76 * return the control to that thread. 77 */ 78 static void nvmm_kick_vcpu_thread(CPUState *cpu) 79 { 80 cpu->exit_request = 1; 81 cpus_kick_thread(cpu); 82 } 83 84 static void nvmm_accel_ops_class_init(ObjectClass *oc, void *data) 85 { 86 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc); 87 88 ops->create_vcpu_thread = nvmm_start_vcpu_thread; 89 ops->kick_vcpu_thread = nvmm_kick_vcpu_thread; 90 91 ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset; 92 ops->synchronize_post_init = nvmm_cpu_synchronize_post_init; 93 ops->synchronize_state = nvmm_cpu_synchronize_state; 94 ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm; 95 } 96 97 static const TypeInfo nvmm_accel_ops_type = { 98 .name = ACCEL_OPS_NAME("nvmm"), 99 100 .parent = TYPE_ACCEL_OPS, 101 .class_init = nvmm_accel_ops_class_init, 102 .abstract = true, 103 }; 104 105 static void nvmm_accel_ops_register_types(void) 106 { 107 type_register_static(&nvmm_accel_ops_type); 108 } 109 type_init(nvmm_accel_ops_register_types); 110