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KVM: Add kvm trace userspace interface

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This interface allows user a space application to read the trace of kvm
related events through relayfs.

Signed-off-by: Feng (Eric) Liu <eric.e.liu@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Feng(Eric) Liu
2008-04-10 08:47:53 -04:00
committed by Avi Kivity
parent 048354c8e6
commit d4c9ff2d1b
5 changed files with 311 additions and 1 deletions
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8
virt/kvm/kvm_main.c
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@@ -60,7 +60,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
static __read_mostly struct preempt_ops kvm_preempt_ops;
static struct dentry *debugfs_dir;
struct dentry *debugfs_dir;
static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
unsigned long arg);
@@ -1191,6 +1191,11 @@ static long kvm_dev_ioctl(struct file *filp,
r += PAGE_SIZE; /* pio data page */
#endif
break;
case KVM_TRACE_ENABLE:
case KVM_TRACE_PAUSE:
case KVM_TRACE_DISABLE:
r = kvm_trace_ioctl(ioctl, arg);
break;
default:
return kvm_arch_dev_ioctl(filp, ioctl, arg);
}
@@ -1519,6 +1524,7 @@ EXPORT_SYMBOL_GPL(kvm_init);
void kvm_exit(void)
{
kvm_trace_cleanup();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
sysdev_unregister(&kvm_sysdev);