KVM: remove old KVMTRACE support code
Return EOPNOTSUPP for KVM_TRACE_ENABLE/PAUSE/DISABLE ioctls.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f1e2e8c..bbb4029 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2398,7 +2398,7 @@
case KVM_TRACE_ENABLE:
case KVM_TRACE_PAUSE:
case KVM_TRACE_DISABLE:
- r = kvm_trace_ioctl(ioctl, arg);
+ r = -EOPNOTSUPP;
break;
default:
return kvm_arch_dev_ioctl(filp, ioctl, arg);
@@ -2748,7 +2748,6 @@
void kvm_exit(void)
{
- kvm_trace_cleanup();
tracepoint_synchronize_unregister();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
diff --git a/virt/kvm/kvm_trace.c b/virt/kvm/kvm_trace.c
deleted file mode 100644
index f598744..0000000
--- a/virt/kvm/kvm_trace.c
+++ /dev/null
@@ -1,285 +0,0 @@
-/*
- * kvm trace
- *
- * It is designed to allow debugging traces of kvm to be generated
- * on UP / SMP machines. Each trace entry can be timestamped so that
- * it's possible to reconstruct a chronological record of trace events.
- * The implementation refers to blktrace kernel support.
- *
- * Copyright (c) 2008 Intel Corporation
- * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
- *
- * Authors: Feng(Eric) Liu, eric.e.liu@intel.com
- *
- * Date: Feb 2008
- */
-
-#include <linux/module.h>
-#include <linux/relay.h>
-#include <linux/debugfs.h>
-#include <linux/ktime.h>
-
-#include <linux/kvm_host.h>
-
-#define KVM_TRACE_STATE_RUNNING (1 << 0)
-#define KVM_TRACE_STATE_PAUSE (1 << 1)
-#define KVM_TRACE_STATE_CLEARUP (1 << 2)
-
-struct kvm_trace {
- int trace_state;
- struct rchan *rchan;
- struct dentry *lost_file;
- atomic_t lost_records;
-};
-static struct kvm_trace *kvm_trace;
-
-struct kvm_trace_probe {
- const char *name;
- const char *format;
- u32 timestamp_in;
- marker_probe_func *probe_func;
-};
-
-static inline int calc_rec_size(int timestamp, int extra)
-{
- int rec_size = KVM_TRC_HEAD_SIZE;
-
- rec_size += extra;
- return timestamp ? rec_size += KVM_TRC_CYCLE_SIZE : rec_size;
-}
-
-static void kvm_add_trace(void *probe_private, void *call_data,
- const char *format, va_list *args)
-{
- struct kvm_trace_probe *p = probe_private;
- struct kvm_trace *kt = kvm_trace;
- struct kvm_trace_rec rec;
- struct kvm_vcpu *vcpu;
- int i, size;
- u32 extra;
-
- if (unlikely(kt->trace_state != KVM_TRACE_STATE_RUNNING))
- return;
-
- rec.rec_val = TRACE_REC_EVENT_ID(va_arg(*args, u32));
- vcpu = va_arg(*args, struct kvm_vcpu *);
- rec.pid = current->tgid;
- rec.vcpu_id = vcpu->vcpu_id;
-
- extra = va_arg(*args, u32);
- WARN_ON(!(extra <= KVM_TRC_EXTRA_MAX));
- extra = min_t(u32, extra, KVM_TRC_EXTRA_MAX);
-
- rec.rec_val |= TRACE_REC_TCS(p->timestamp_in)
- | TRACE_REC_NUM_DATA_ARGS(extra);
-
- if (p->timestamp_in) {
- rec.u.timestamp.timestamp = ktime_to_ns(ktime_get());
-
- for (i = 0; i < extra; i++)
- rec.u.timestamp.extra_u32[i] = va_arg(*args, u32);
- } else {
- for (i = 0; i < extra; i++)
- rec.u.notimestamp.extra_u32[i] = va_arg(*args, u32);
- }
-
- size = calc_rec_size(p->timestamp_in, extra * sizeof(u32));
- relay_write(kt->rchan, &rec, size);
-}
-
-static struct kvm_trace_probe kvm_trace_probes[] = {
- { "kvm_trace_entryexit", "%u %p %u %u %u %u %u %u", 1, kvm_add_trace },
- { "kvm_trace_handler", "%u %p %u %u %u %u %u %u", 0, kvm_add_trace },
-};
-
-static int lost_records_get(void *data, u64 *val)
-{
- struct kvm_trace *kt = data;
-
- *val = atomic_read(&kt->lost_records);
- return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(kvm_trace_lost_ops, lost_records_get, NULL, "%llu\n");
-
-/*
- * The relay channel is used in "no-overwrite" mode, it keeps trace of how
- * many times we encountered a full subbuffer, to tell user space app the
- * lost records there were.
- */
-static int kvm_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
- void *prev_subbuf, size_t prev_padding)
-{
- struct kvm_trace *kt;
-
- if (!relay_buf_full(buf)) {
- if (!prev_subbuf) {
- /*
- * executed only once when the channel is opened
- * save metadata as first record
- */
- subbuf_start_reserve(buf, sizeof(u32));
- *(u32 *)subbuf = 0x12345678;
- }
-
- return 1;
- }
-
- kt = buf->chan->private_data;
- atomic_inc(&kt->lost_records);
-
- return 0;
-}
-
-static struct dentry *kvm_create_buf_file_callack(const char *filename,
- struct dentry *parent,
- int mode,
- struct rchan_buf *buf,
- int *is_global)
-{
- return debugfs_create_file(filename, mode, parent, buf,
- &relay_file_operations);
-}
-
-static int kvm_remove_buf_file_callback(struct dentry *dentry)
-{
- debugfs_remove(dentry);
- return 0;
-}
-
-static struct rchan_callbacks kvm_relay_callbacks = {
- .subbuf_start = kvm_subbuf_start_callback,
- .create_buf_file = kvm_create_buf_file_callack,
- .remove_buf_file = kvm_remove_buf_file_callback,
-};
-
-static int do_kvm_trace_enable(struct kvm_user_trace_setup *kuts)
-{
- struct kvm_trace *kt;
- int i, r = -ENOMEM;
-
- if (!kuts->buf_size || !kuts->buf_nr)
- return -EINVAL;
-
- kt = kzalloc(sizeof(*kt), GFP_KERNEL);
- if (!kt)
- goto err;
-
- r = -EIO;
- atomic_set(&kt->lost_records, 0);
- kt->lost_file = debugfs_create_file("lost_records", 0444, kvm_debugfs_dir,
- kt, &kvm_trace_lost_ops);
- if (!kt->lost_file)
- goto err;
-
- kt->rchan = relay_open("trace", kvm_debugfs_dir, kuts->buf_size,
- kuts->buf_nr, &kvm_relay_callbacks, kt);
- if (!kt->rchan)
- goto err;
-
- kvm_trace = kt;
-
- for (i = 0; i < ARRAY_SIZE(kvm_trace_probes); i++) {
- struct kvm_trace_probe *p = &kvm_trace_probes[i];
-
- r = marker_probe_register(p->name, p->format, p->probe_func, p);
- if (r)
- printk(KERN_INFO "Unable to register probe %s\n",
- p->name);
- }
-
- kvm_trace->trace_state = KVM_TRACE_STATE_RUNNING;
-
- return 0;
-err:
- if (kt) {
- if (kt->lost_file)
- debugfs_remove(kt->lost_file);
- if (kt->rchan)
- relay_close(kt->rchan);
- kfree(kt);
- }
- return r;
-}
-
-static int kvm_trace_enable(char __user *arg)
-{
- struct kvm_user_trace_setup kuts;
- int ret;
-
- ret = copy_from_user(&kuts, arg, sizeof(kuts));
- if (ret)
- return -EFAULT;
-
- ret = do_kvm_trace_enable(&kuts);
- if (ret)
- return ret;
-
- return 0;
-}
-
-static int kvm_trace_pause(void)
-{
- struct kvm_trace *kt = kvm_trace;
- int r = -EINVAL;
-
- if (kt == NULL)
- return r;
-
- if (kt->trace_state == KVM_TRACE_STATE_RUNNING) {
- kt->trace_state = KVM_TRACE_STATE_PAUSE;
- relay_flush(kt->rchan);
- r = 0;
- }
-
- return r;
-}
-
-void kvm_trace_cleanup(void)
-{
- struct kvm_trace *kt = kvm_trace;
- int i;
-
- if (kt == NULL)
- return;
-
- if (kt->trace_state == KVM_TRACE_STATE_RUNNING ||
- kt->trace_state == KVM_TRACE_STATE_PAUSE) {
-
- kt->trace_state = KVM_TRACE_STATE_CLEARUP;
-
- for (i = 0; i < ARRAY_SIZE(kvm_trace_probes); i++) {
- struct kvm_trace_probe *p = &kvm_trace_probes[i];
- marker_probe_unregister(p->name, p->probe_func, p);
- }
- marker_synchronize_unregister();
-
- relay_close(kt->rchan);
- debugfs_remove(kt->lost_file);
- kfree(kt);
- }
-}
-
-int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- long r = -EINVAL;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- switch (ioctl) {
- case KVM_TRACE_ENABLE:
- r = kvm_trace_enable(argp);
- break;
- case KVM_TRACE_PAUSE:
- r = kvm_trace_pause();
- break;
- case KVM_TRACE_DISABLE:
- r = 0;
- kvm_trace_cleanup();
- break;
- }
-
- return r;
-}