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| author | Hamo <hamo.by@gmail.com> | 2011-12-15 14:23:16 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-12-27 11:22:33 +0200 |
| commit | 4f69b6805c4f818cf7f4126978cc4a54c489119f (patch) | |
| tree | 74f32a6cb922e285bfbeb5dba4ef872088fb8d55 /virt | |
| parent | d546cb406ea0d83e2d39ec14221957a24f88a622 (diff) | |
| download | lwn-4f69b6805c4f818cf7f4126978cc4a54c489119f.tar.gz lwn-4f69b6805c4f818cf7f4126978cc4a54c489119f.zip | |
KVM: ensure that debugfs entries have been created
by checking the return value from kvm_init_debug, we
can ensure that the entries under debugfs for KVM have
been created correctly.
Signed-off-by: Yang Bai <hamo.by@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 0835c4b90d2f..7287bf5d1c9e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2654,15 +2654,29 @@ static const struct file_operations *stat_fops[] = { [KVM_STAT_VM] = &vm_stat_fops, }; -static void kvm_init_debug(void) +static int kvm_init_debug(void) { + int r = -EFAULT; struct kvm_stats_debugfs_item *p; kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); - for (p = debugfs_entries; p->name; ++p) + if (kvm_debugfs_dir == NULL) + goto out; + + for (p = debugfs_entries; p->name; ++p) { p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, (void *)(long)p->offset, stat_fops[p->kind]); + if (p->dentry == NULL) + goto out_dir; + } + + return 0; + +out_dir: + debugfs_remove_recursive(kvm_debugfs_dir); +out: + return r; } static void kvm_exit_debug(void) @@ -2806,10 +2820,16 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, kvm_preempt_ops.sched_in = kvm_sched_in; kvm_preempt_ops.sched_out = kvm_sched_out; - kvm_init_debug(); + r = kvm_init_debug(); + if (r) { + printk(KERN_ERR "kvm: create debugfs files failed\n"); + goto out_undebugfs; + } return 0; +out_undebugfs: + unregister_syscore_ops(&kvm_syscore_ops); out_unreg: kvm_async_pf_deinit(); out_free: |