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-rw-r--r--virt/kvm/kvm_main.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7766c2b52797..82987d457b8b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -130,6 +130,12 @@ EXPORT_SYMBOL_GPL(kvm_rebooting);
static bool largepages_enabled = true;
+#define KVM_EVENT_CREATE_VM 0
+#define KVM_EVENT_DESTROY_VM 1
+static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
+static unsigned long long kvm_createvm_count;
+static unsigned long long kvm_active_vms;
+
bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
{
if (pfn_valid(pfn))
@@ -740,6 +746,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
int i;
struct mm_struct *mm = kvm->mm;
+ kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
kvm_destroy_vm_debugfs(kvm);
kvm_arch_sync_events(kvm);
spin_lock(&kvm_lock);
@@ -3220,6 +3227,7 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
fput(file);
return -ENOMEM;
}
+ kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
fd_install(r, file);
return r;
@@ -3872,6 +3880,67 @@ static const struct file_operations *stat_fops[] = {
[KVM_STAT_VM] = &vm_stat_fops,
};
+static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
+{
+ struct kobj_uevent_env *env;
+ char *tmp, *pathbuf = NULL;
+ unsigned long long created, active;
+
+ if (!kvm_dev.this_device || !kvm)
+ return;
+
+ spin_lock(&kvm_lock);
+ if (type == KVM_EVENT_CREATE_VM) {
+ kvm_createvm_count++;
+ kvm_active_vms++;
+ } else if (type == KVM_EVENT_DESTROY_VM) {
+ kvm_active_vms--;
+ }
+ created = kvm_createvm_count;
+ active = kvm_active_vms;
+ spin_unlock(&kvm_lock);
+
+ env = kzalloc(sizeof(*env), GFP_KERNEL);
+ if (!env)
+ return;
+
+ add_uevent_var(env, "CREATED=%llu", created);
+ add_uevent_var(env, "COUNT=%llu", active);
+
+ if (type == KVM_EVENT_CREATE_VM)
+ add_uevent_var(env, "EVENT=create");
+ else if (type == KVM_EVENT_DESTROY_VM)
+ add_uevent_var(env, "EVENT=destroy");
+
+ if (kvm->debugfs_dentry) {
+ char p[ITOA_MAX_LEN];
+
+ snprintf(p, sizeof(p), "%s", kvm->debugfs_dentry->d_name.name);
+ tmp = strchrnul(p + 1, '-');
+ *tmp = '\0';
+ add_uevent_var(env, "PID=%s", p);
+ pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (pathbuf) {
+ /* sizeof counts the final '\0' */
+ int len = sizeof("STATS_PATH=") - 1;
+ const char *pvar = "STATS_PATH=";
+
+ tmp = dentry_path_raw(kvm->debugfs_dentry,
+ pathbuf + len,
+ PATH_MAX - len);
+ if (!IS_ERR(tmp)) {
+ memcpy(tmp - len, pvar, len);
+ env->envp[env->envp_idx++] = tmp - len;
+ }
+ }
+ }
+ /* no need for checks, since we are adding at most only 5 keys */
+ env->envp[env->envp_idx++] = NULL;
+ kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
+ kfree(env);
+ kfree(pathbuf);
+}
+
static int kvm_init_debug(void)
{
int r = -EEXIST;