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KVM: make pid available for uevents without debugfs

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Simplify and improve the code so that the PID is always available in
the uevent even when debugfs is not available.

This adds a userspace_pid field to struct kvm, as per Radim's
suggestion, so that the PID can be retrieved on destruction too.

Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Fixes: 286de8f6ac ("KVM: trigger uevents when creating or destroying a VM")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Imbrenda 2017-07-24 13:40:03 +02:00 committed by Paolo Bonzini
parent fa19871a16
commit fdeaf7e3eb
2 changed files with 12 additions and 22 deletions
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1
include/linux/kvm_host.h
View File

@ -445,6 +445,7 @@ struct kvm {
struct kvm_stat_data **debugfs_stat_data;
struct srcu_struct srcu;
struct srcu_struct irq_srcu;
pid_t userspace_pid;
};
#define kvm_err(fmt, ...) \

33
virt/kvm/kvm_main.c
View File

@ -3883,7 +3883,6 @@ static const struct file_operations *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)
@ -3907,38 +3906,28 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
add_uevent_var(env, "CREATED=%llu", created);
add_uevent_var(env, "COUNT=%llu", active);
if (type == KVM_EVENT_CREATE_VM)
if (type == KVM_EVENT_CREATE_VM) {
add_uevent_var(env, "EVENT=create");
else if (type == KVM_EVENT_DESTROY_VM)
kvm->userspace_pid = task_pid_nr(current);
} else if (type == KVM_EVENT_DESTROY_VM) {
add_uevent_var(env, "EVENT=destroy");
}
add_uevent_var(env, "PID=%d", kvm->userspace_pid);
if (kvm->debugfs_dentry) {
char p[ITOA_MAX_LEN];
char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
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;
}
if (p) {
tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
if (!IS_ERR(tmp))
add_uevent_var(env, "STATS_PATH=%s", tmp);
kfree(p);
}
}
/* 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)