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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-10 13:45:26 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-10 13:45:26 -0400 |
| commit | c3e9434c9852c09cd1756b05d1474b7c84452819 (patch) | |
| tree | 15c0dff034fcea01c6a48b9eae91c79e5e379866 /virt | |
| parent | 32bdc01988413031c6e743714c2b40bdd773e5db (diff) | |
| parent | 7b9cae027ba3aaac295ae23a62f47876ed97da73 (diff) | |
Merge branch 'kvm-vmx-secctl' into HEAD
Merge common topic branch for 5.14-rc6 and 5.15 merge window.
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 30d322519253..c115e2648d9d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -914,6 +914,8 @@ static void kvm_destroy_vm_debugfs(struct kvm *kvm) static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) { + static DEFINE_MUTEX(kvm_debugfs_lock); + struct dentry *dent; char dir_name[ITOA_MAX_LEN * 2]; struct kvm_stat_data *stat_data; const struct _kvm_stats_desc *pdesc; @@ -925,8 +927,20 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) 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); + mutex_lock(&kvm_debugfs_lock); + dent = debugfs_lookup(dir_name, kvm_debugfs_dir); + if (dent) { + pr_warn_ratelimited("KVM: debugfs: duplicate directory %s\n", dir_name); + dput(dent); + mutex_unlock(&kvm_debugfs_lock); + return 0; + } + dent = debugfs_create_dir(dir_name, kvm_debugfs_dir); + mutex_unlock(&kvm_debugfs_lock); + if (IS_ERR(dent)) + return 0; + kvm->debugfs_dentry = dent; kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, sizeof(*kvm->debugfs_stat_data), GFP_KERNEL_ACCOUNT); @@ -5280,7 +5294,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) } add_uevent_var(env, "PID=%d", kvm->userspace_pid); - if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) { + if (kvm->debugfs_dentry) { char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); if (p) { |