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>

10 files changed, 2 insertions, 380 deletions

diff --git a/arch/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig
index cbadd8a65233..ef3e7be29caf 100644
--- a/arch/ia64/kvm/Kconfig
+++ b/arch/ia64/kvm/Kconfig
@@ -47,9 +47,6 @@ config KVM_INTEL
           Provides support for KVM on Itanium 2 processors equipped with the VT
           extensions.
 
-config KVM_TRACE
-       bool
-
 source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 46019dccce1c..c29926846613 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -58,17 +58,6 @@ config KVM_E500
 
           If unsure, say N.
 
-config KVM_TRACE
-        bool "KVM trace support"
-        depends on KVM && MARKERS && SYSFS
-        select RELAY
-        select DEBUG_FS
-        default n
-        ---help---
-          This option allows reading a trace of kvm-related events through
-          relayfs.  Note the ABI is not considered stable and will be
-          modified in future updates.
-
 source drivers/virtio/Kconfig
 
 endif # VIRTUALIZATION
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 4f407f2662f7..37655fe19f2f 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -8,8 +8,6 @@ EXTRA_CFLAGS += -Ivirt/kvm -Iarch/powerpc/kvm
 
 common-objs-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
 
-common-objs-$(CONFIG_KVM_TRACE)  += $(addprefix ../../../virt/kvm/, kvm_trace.o)
-
 CFLAGS_44x_tlb.o  := -I.
 CFLAGS_e500_tlb.o := -I.
 CFLAGS_emulate.o  := -I.
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index ad75ce33be12..bf164fc21864 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -34,9 +34,6 @@ config KVM
 
           If unsure, say N.
 
-config KVM_TRACE
-       bool
-
 # OK, it's a little counter-intuitive to do this, but it puts it neatly under
 # the virtualization menu.
 source drivers/virtio/Kconfig
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 7fbedfd34d6c..b84e571f4175 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -62,18 +62,6 @@ config KVM_AMD
           To compile this as a module, choose M here: the module
           will be called kvm-amd.
 
-config KVM_TRACE
-        bool "KVM trace support"
-        depends on KVM && SYSFS
-        select MARKERS
-        select RELAY
-        select DEBUG_FS
-        default n
-        ---help---
-          This option allows reading a trace of kvm-related events through
-          relayfs.  Note the ABI is not considered stable and will be
-          modified in future updates.
-
 # OK, it's a little counter-intuitive to do this, but it puts it neatly under
 # the virtualization menu.
 source drivers/lguest/Kconfig
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 7c56850b82cb..afaaa7627d95 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -7,7 +7,6 @@ CFLAGS_vmx.o := -I.
 
 kvm-y                   += $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
                                 coalesced_mmio.o irq_comm.o eventfd.o)
-kvm-$(CONFIG_KVM_TRACE) += $(addprefix ../../../virt/kvm/, kvm_trace.o)
 kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o)
 
 kvm-y                   += x86.o mmu.o x86_emulate.o i8259.o irq.o lapic.o \
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 671051829da6..76c640834ea6 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -14,7 +14,7 @@
 
 #define KVM_API_VERSION 12
 
-/* for KVM_TRACE_ENABLE */
+/* for KVM_TRACE_ENABLE, deprecated */
 struct kvm_user_trace_setup {
         __u32 buf_size; /* sub_buffer size of each per-cpu */
         __u32 buf_nr; /* the number of sub_buffers of each per-cpu */
@@ -325,35 +325,6 @@ struct kvm_guest_debug {
 #define KVM_TRC_CYCLE_SIZE      8
 #define KVM_TRC_EXTRA_MAX       7
 
-/* This structure represents a single trace buffer record. */
-struct kvm_trace_rec {
-        /* variable rec_val
-         * is split into:
-         * bits 0 - 27  -> event id
-         * bits 28 -30  -> number of extra data args of size u32
-         * bits 31      -> binary indicator for if tsc is in record
-         */
-        __u32 rec_val;
-        __u32 pid;
-        __u32 vcpu_id;
-        union {
-                struct {
-                        __u64 timestamp;
-                        __u32 extra_u32[KVM_TRC_EXTRA_MAX];
-                } __attribute__((packed)) timestamp;
-                struct {
-                        __u32 extra_u32[KVM_TRC_EXTRA_MAX];
-                } notimestamp;
-        } u;
-};
-
-#define TRACE_REC_EVENT_ID(val) \
-                (0x0fffffff & (val))
-#define TRACE_REC_NUM_DATA_ARGS(val) \
-                (0x70000000 & ((val) << 28))
-#define TRACE_REC_TCS(val) \
-                (0x80000000 & ((val) << 31))
-
 #define KVMIO 0xAE
 
 /*
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 06af936a250a..0604d56f6eed 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -482,37 +482,6 @@ struct kvm_stats_debugfs_item {
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
 
-#define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 5, d1, d2, d3, d4, d5)
-#define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 4, d1, d2, d3, d4, 0)
-#define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 3, d1, d2, d3, 0, 0)
-#define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 2, d1, d2, 0, 0, 0)
-#define KVMTRACE_1D(evt, vcpu, d1, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 1, d1, 0, 0, 0, 0)
-#define KVMTRACE_0D(evt, vcpu, name) \
-        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
-                                                vcpu, 0, 0, 0, 0, 0, 0)
-
-#ifdef CONFIG_KVM_TRACE
-int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg);
-void kvm_trace_cleanup(void);
-#else
-static inline
-int kvm_trace_ioctl(unsigned int ioctl, unsigned long arg)
-{
-        return -EINVAL;
-}
-#define kvm_trace_cleanup() ((void)0)
-#endif
-
 #ifdef KVM_ARCH_WANT_MMU_NOTIFIER
 static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
 {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f1e2e8c373c6..bbb4029d7c4d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2398,7 +2398,7 @@ static long kvm_dev_ioctl(struct file *filp,
         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 @@ EXPORT_SYMBOL_GPL(kvm_init);
 
 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 f59874446440..000000000000
--- 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;
-}