| 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 "accel/accel-cpu-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 | qemu_process_cpu_events(cpu); |
| 46 | |
| 47 | if (cpu_can_run(cpu)) { |
| 48 | r = nvmm_vcpu_exec(cpu); |
| 49 | if (r == EXCP_DEBUG) { |
| 50 | cpu_handle_guest_debug(cpu); |
| 51 | } |
| 52 | } |
| 53 | } while (!cpu->unplug || cpu_can_run(cpu)); |
| 54 | |
| 55 | nvmm_destroy_vcpu(cpu); |
| 56 | cpu_thread_signal_destroyed(cpu); |
| 57 | bql_unlock(); |
| 58 | rcu_unregister_thread(); |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | static void nvmm_start_vcpu_thread(CPUState *cpu) |
| 63 | { |
| 64 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
| 65 | |
| 66 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM", |
| 67 | cpu->cpu_index); |
| 68 | qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn, |
| 69 | cpu, QEMU_THREAD_JOINABLE); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Abort the call to run the virtual processor by another thread, and to |
| 74 | * return the control to that thread. |
| 75 | */ |
| 76 | static void nvmm_kick_vcpu_thread(CPUState *cpu) |
| 77 | { |
| 78 | qatomic_set(&cpu->exit_request, true); |
| 79 | cpus_kick_thread(cpu); |
| 80 | } |
| 81 | |
| 82 | static void nvmm_accel_ops_class_init(ObjectClass *oc, const void *data) |
| 83 | { |
| 84 | AccelOpsClass *ops = ACCEL_OPS_CLASS(oc); |
| 85 | |
| 86 | ops->create_vcpu_thread = nvmm_start_vcpu_thread; |
| 87 | ops->kick_vcpu_thread = nvmm_kick_vcpu_thread; |
| 88 | ops->handle_interrupt = generic_handle_interrupt; |
| 89 | |
| 90 | ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset; |
| 91 | ops->synchronize_post_init = nvmm_cpu_synchronize_post_init; |
| 92 | ops->synchronize_state = nvmm_cpu_synchronize_state; |
| 93 | ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm; |
| 94 | } |
| 95 | |
| 96 | static const TypeInfo nvmm_accel_ops_type = { |
| 97 | .name = ACCEL_OPS_NAME("nvmm"), |
| 98 | |
| 99 | .parent = TYPE_ACCEL_OPS, |
| 100 | .class_init = nvmm_accel_ops_class_init, |
| 101 | .abstract = true, |
| 102 | }; |
| 103 | |
| 104 | static void nvmm_accel_ops_register_types(void) |
| 105 | { |
| 106 | type_register_static(&nvmm_accel_ops_type); |
| 107 | } |
| 108 | type_init(nvmm_accel_ops_register_types); |