From 863981e96738983919de841ec669e157e6bdaeb0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Sun, 11 Sep 2016 04:34:46 -0300 Subject: Linux-libre 4.7.1-gnu --- virt/kvm/kvm_main.c | 241 +++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 212 insertions(+), 29 deletions(-) (limited to 'virt/kvm/kvm_main.c') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7cb12249b..48bd520fc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -63,6 +63,9 @@ #define CREATE_TRACE_POINTS #include +/* Worst case buffer size needed for holding an integer. */ +#define ITOA_MAX_LEN 12 + MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); @@ -100,6 +103,9 @@ static __read_mostly struct preempt_ops kvm_preempt_ops; struct dentry *kvm_debugfs_dir; EXPORT_SYMBOL_GPL(kvm_debugfs_dir); +static int kvm_debugfs_num_entries; +static const struct file_operations *stat_fops_per_vm[]; + static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, unsigned long arg); #ifdef CONFIG_KVM_COMPAT @@ -542,6 +548,58 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) kvfree(slots); } +static void kvm_destroy_vm_debugfs(struct kvm *kvm) +{ + int i; + + if (!kvm->debugfs_dentry) + return; + + debugfs_remove_recursive(kvm->debugfs_dentry); + + for (i = 0; i < kvm_debugfs_num_entries; i++) + kfree(kvm->debugfs_stat_data[i]); + kfree(kvm->debugfs_stat_data); +} + +static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) +{ + char dir_name[ITOA_MAX_LEN * 2]; + struct kvm_stat_data *stat_data; + struct kvm_stats_debugfs_item *p; + + if (!debugfs_initialized()) + return 0; + + snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); + kvm->debugfs_dentry = debugfs_create_dir(dir_name, + kvm_debugfs_dir); + if (!kvm->debugfs_dentry) + return -ENOMEM; + + kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, + sizeof(*kvm->debugfs_stat_data), + GFP_KERNEL); + if (!kvm->debugfs_stat_data) + return -ENOMEM; + + for (p = debugfs_entries; p->name; p++) { + stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); + if (!stat_data) + return -ENOMEM; + + stat_data->kvm = kvm; + stat_data->offset = p->offset; + kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; + if (!debugfs_create_file(p->name, 0444, + kvm->debugfs_dentry, + stat_data, + stat_fops_per_vm[p->kind])) + return -ENOMEM; + } + return 0; +} + static struct kvm *kvm_create_vm(unsigned long type) { int r, i; @@ -647,6 +705,7 @@ static void kvm_destroy_vm(struct kvm *kvm) int i; struct mm_struct *mm = kvm->mm; + kvm_destroy_vm_debugfs(kvm); kvm_arch_sync_events(kvm); spin_lock(&kvm_lock); list_del(&kvm->vm_list); @@ -2028,6 +2087,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) */ if (kvm_vcpu_check_block(vcpu) < 0) { ++vcpu->stat.halt_successful_poll; + if (!vcpu_valid_wakeup(vcpu)) + ++vcpu->stat.halt_poll_invalid; goto out; } cur = ktime_get(); @@ -2053,7 +2114,9 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) out: block_ns = ktime_to_ns(cur) - ktime_to_ns(start); - if (halt_poll_ns) { + if (!vcpu_valid_wakeup(vcpu)) + shrink_halt_poll_ns(vcpu); + else if (halt_poll_ns) { if (block_ns <= vcpu->halt_poll_ns) ; /* we had a long block, shrink polling */ @@ -2066,18 +2129,14 @@ out: } else vcpu->halt_poll_ns = 0; - trace_kvm_vcpu_wakeup(block_ns, waited); + trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); + kvm_arch_vcpu_block_finish(vcpu); } EXPORT_SYMBOL_GPL(kvm_vcpu_block); #ifndef CONFIG_S390 -/* - * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. - */ -void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) { - int me; - int cpu = vcpu->cpu; struct swait_queue_head *wqp; wqp = kvm_arch_vcpu_wq(vcpu); @@ -2086,6 +2145,18 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu) ++vcpu->stat.halt_wakeup; } +} +EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); + +/* + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. + */ +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +{ + int me; + int cpu = vcpu->cpu; + + kvm_vcpu_wake_up(vcpu); me = get_cpu(); if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) if (kvm_arch_vcpu_should_kick(vcpu)) @@ -2272,7 +2343,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) int r; struct kvm_vcpu *vcpu; - if (id >= KVM_MAX_VCPUS) + if (id >= KVM_MAX_VCPU_ID) return -EINVAL; vcpu = kvm_arch_vcpu_create(kvm, id); @@ -2746,6 +2817,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_MULTI_ADDRESS_SPACE: return KVM_ADDRESS_SPACE_NUM; #endif + case KVM_CAP_MAX_VCPU_ID: + return KVM_MAX_VCPU_ID; default: break; } @@ -2862,7 +2935,7 @@ static long kvm_vm_ioctl(struct file *filp, case KVM_SET_GSI_ROUTING: { struct kvm_irq_routing routing; struct kvm_irq_routing __user *urouting; - struct kvm_irq_routing_entry *entries; + struct kvm_irq_routing_entry *entries = NULL; r = -EFAULT; if (copy_from_user(&routing, argp, sizeof(routing))) @@ -2872,15 +2945,17 @@ static long kvm_vm_ioctl(struct file *filp, goto out; if (routing.flags) goto out; - r = -ENOMEM; - entries = vmalloc(routing.nr * sizeof(*entries)); - if (!entries) - goto out; - r = -EFAULT; - urouting = argp; - if (copy_from_user(entries, urouting->entries, - routing.nr * sizeof(*entries))) - goto out_free_irq_routing; + if (routing.nr) { + r = -ENOMEM; + entries = vmalloc(routing.nr * sizeof(*entries)); + if (!entries) + goto out; + r = -EFAULT; + urouting = argp; + if (copy_from_user(entries, urouting->entries, + routing.nr * sizeof(*entries))) + goto out_free_irq_routing; + } r = kvm_set_irq_routing(kvm, entries, routing.nr, routing.flags); out_free_irq_routing: @@ -2985,8 +3060,15 @@ static int kvm_dev_ioctl_create_vm(unsigned long type) } #endif r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC); - if (r < 0) + if (r < 0) { + kvm_put_kvm(kvm); + return r; + } + + if (kvm_create_vm_debugfs(kvm, r) < 0) { kvm_put_kvm(kvm); + return -ENOMEM; + } return r; } @@ -3411,15 +3493,114 @@ static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, }; +static int kvm_debugfs_open(struct inode *inode, struct file *file, + int (*get)(void *, u64 *), int (*set)(void *, u64), + const char *fmt) +{ + struct kvm_stat_data *stat_data = (struct kvm_stat_data *) + inode->i_private; + + /* The debugfs files are a reference to the kvm struct which + * is still valid when kvm_destroy_vm is called. + * To avoid the race between open and the removal of the debugfs + * directory we test against the users count. + */ + if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0)) + return -ENOENT; + + if (simple_attr_open(inode, file, get, set, fmt)) { + kvm_put_kvm(stat_data->kvm); + return -ENOMEM; + } + + return 0; +} + +static int kvm_debugfs_release(struct inode *inode, struct file *file) +{ + struct kvm_stat_data *stat_data = (struct kvm_stat_data *) + inode->i_private; + + simple_attr_release(inode, file); + kvm_put_kvm(stat_data->kvm); + + return 0; +} + +static int vm_stat_get_per_vm(void *data, u64 *val) +{ + struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; + + *val = *(u32 *)((void *)stat_data->kvm + stat_data->offset); + + return 0; +} + +static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) +{ + __simple_attr_check_format("%llu\n", 0ull); + return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, + NULL, "%llu\n"); +} + +static const struct file_operations vm_stat_get_per_vm_fops = { + .owner = THIS_MODULE, + .open = vm_stat_get_per_vm_open, + .release = kvm_debugfs_release, + .read = simple_attr_read, + .write = simple_attr_write, + .llseek = generic_file_llseek, +}; + +static int vcpu_stat_get_per_vm(void *data, u64 *val) +{ + int i; + struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; + struct kvm_vcpu *vcpu; + + *val = 0; + + kvm_for_each_vcpu(i, vcpu, stat_data->kvm) + *val += *(u32 *)((void *)vcpu + stat_data->offset); + + return 0; +} + +static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) +{ + __simple_attr_check_format("%llu\n", 0ull); + return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, + NULL, "%llu\n"); +} + +static const struct file_operations vcpu_stat_get_per_vm_fops = { + .owner = THIS_MODULE, + .open = vcpu_stat_get_per_vm_open, + .release = kvm_debugfs_release, + .read = simple_attr_read, + .write = simple_attr_write, + .llseek = generic_file_llseek, +}; + +static const struct file_operations *stat_fops_per_vm[] = { + [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, + [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, +}; + static int vm_stat_get(void *_offset, u64 *val) { unsigned offset = (long)_offset; struct kvm *kvm; + struct kvm_stat_data stat_tmp = {.offset = offset}; + u64 tmp_val; *val = 0; spin_lock(&kvm_lock); - list_for_each_entry(kvm, &vm_list, vm_list) - *val += *(u32 *)((void *)kvm + offset); + list_for_each_entry(kvm, &vm_list, vm_list) { + stat_tmp.kvm = kvm; + vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); + *val += tmp_val; + } spin_unlock(&kvm_lock); return 0; } @@ -3430,15 +3611,16 @@ static int vcpu_stat_get(void *_offset, u64 *val) { unsigned offset = (long)_offset; struct kvm *kvm; - struct kvm_vcpu *vcpu; - int i; + struct kvm_stat_data stat_tmp = {.offset = offset}; + u64 tmp_val; *val = 0; spin_lock(&kvm_lock); - list_for_each_entry(kvm, &vm_list, vm_list) - kvm_for_each_vcpu(i, vcpu, kvm) - *val += *(u32 *)((void *)vcpu + offset); - + list_for_each_entry(kvm, &vm_list, vm_list) { + stat_tmp.kvm = kvm; + vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); + *val += tmp_val; + } spin_unlock(&kvm_lock); return 0; } @@ -3459,7 +3641,8 @@ static int kvm_init_debug(void) if (kvm_debugfs_dir == NULL) goto out; - for (p = debugfs_entries; p->name; ++p) { + kvm_debugfs_num_entries = 0; + for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir, (void *)(long)p->offset, stat_fops[p->kind])) -- cgit v1.2.3-54-g00ecf