[PATCH 1/4] KVM: MMU: support disable/enable mmu audit dynamicly

From: Xiao Guangrong
Date: Sat Aug 28 2010 - 07:56:41 EST

Add the debugfs file named 'mmu-debug', we can disable/enable mmu audit by
this file:

enable:
echo 1 > debugfs/kvm/mmu-debug

disable:
echo 0 > debugfs/kvm/mmu-debug

This patch not change the logic

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
---
arch/x86/kvm/Kconfig | 6 +
arch/x86/kvm/mmu.c | 250 ++--------------------------------
arch/x86/kvm/mmu_debug.c | 329 ++++++++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/mmu_debug.h | 12 ++
arch/x86/kvm/mmutrace.h | 19 +++
arch/x86/kvm/paging_tmpl.h | 4 +-
virt/kvm/kvm_main.c | 6 +-
7 files changed, 380 insertions(+), 246 deletions(-)
create mode 100644 arch/x86/kvm/mmu_debug.c
create mode 100644 arch/x86/kvm/mmu_debug.h

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 970bbd4..67a941d 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -64,6 +64,12 @@ config KVM_AMD
To compile this as a module, choose M here: the module
will be called kvm-amd.

+config KVM_MMU_DEBUG
+ bool "Debug KVM MMU"
+ depends on KVM && TRACEPOINTS
+ ---help---
+ This feature allows debug KVM MMU at runtime.
+
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source drivers/vhost/Kconfig
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 0bff4d5..8609249 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -19,6 +19,7 @@
*/

#include "mmu.h"
+#include "mmu_debug.h"
#include "x86.h"
#include "kvm_cache_regs.h"

@@ -51,14 +52,6 @@ bool tdp_enabled = false;

#undef MMU_DEBUG

-#undef AUDIT
-
-#ifdef AUDIT
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg);
-#else
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {}
-#endif
-
#ifdef MMU_DEBUG

#define pgprintk(x...) do { if (dbg) printk(x); } while (0)
@@ -71,7 +64,7 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {}

#endif

-#if defined(MMU_DEBUG) || defined(AUDIT)
+#if defined MMU_DEBUG
static int dbg = 0;
module_param(dbg, bool, 0644);
#endif
@@ -2964,7 +2957,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
kvm_mmu_access_page(vcpu, gfn);
kvm_mmu_free_some_pages(vcpu);
++vcpu->kvm->stat.mmu_pte_write;
- kvm_mmu_audit(vcpu, "pre pte write");
+ trace_kvm_mmu_audit(vcpu, "pre pte write");
if (guest_initiated) {
if (gfn == vcpu->arch.last_pt_write_gfn
&& !last_updated_pte_accessed(vcpu)) {
@@ -3037,7 +3030,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush);
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
- kvm_mmu_audit(vcpu, "post pte write");
+ trace_kvm_mmu_audit(vcpu, "post pte write");
spin_unlock(&vcpu->kvm->mmu_lock);
if (!is_error_pfn(vcpu->arch.update_pte.pfn)) {
kvm_release_pfn_clean(vcpu->arch.update_pte.pfn);
@@ -3289,6 +3282,7 @@ void kvm_mmu_module_exit(void)
mmu_destroy_caches();
percpu_counter_destroy(&kvm_total_used_mmu_pages);
unregister_shrinker(&mmu_shrinker);
+ mmu_debug_cleanup();
}

int kvm_mmu_module_init(void)
@@ -3315,6 +3309,8 @@ int kvm_mmu_module_init(void)

register_shrinker(&mmu_shrinker);

+ mmu_debug_init();
+
return 0;

nomem:
@@ -3483,234 +3479,6 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
}
EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy);

-#ifdef AUDIT
-
-static const char *audit_msg;
-
-typedef void (*inspect_spte_fn) (struct kvm *kvm, u64 *sptep);
-
-static void __mmu_spte_walk(struct kvm *kvm, struct kvm_mmu_page *sp,
- inspect_spte_fn fn)
-{
- int i;
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- u64 ent = sp->spt[i];
-
- if (is_shadow_present_pte(ent)) {
- if (!is_last_spte(ent, sp->role.level)) {
- struct kvm_mmu_page *child;
- child = page_header(ent & PT64_BASE_ADDR_MASK);
- __mmu_spte_walk(kvm, child, fn);
- } else
- fn(kvm, &sp->spt[i]);
- }
- }
-}
-
-static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
-{
- int i;
- struct kvm_mmu_page *sp;
-
- if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
- return;
- if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
- hpa_t root = vcpu->arch.mmu.root_hpa;
- sp = page_header(root);
- __mmu_spte_walk(vcpu->kvm, sp, fn);
- return;
- }
- for (i = 0; i < 4; ++i) {
- hpa_t root = vcpu->arch.mmu.pae_root[i];
-
- if (root && VALID_PAGE(root)) {
- root &= PT64_BASE_ADDR_MASK;
- sp = page_header(root);
- __mmu_spte_walk(vcpu->kvm, sp, fn);
- }
- }
- return;
-}
-
-static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
- gva_t va, int level)
-{
- u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK);
- int i;
- gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1));
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
- u64 *sptep = pt + i;
- struct kvm_mmu_page *sp;
- gfn_t gfn;
- pfn_t pfn;
- hpa_t hpa;
-
- sp = page_header(__pa(sptep));
-
- if (sp->unsync) {
- if (level != PT_PAGE_TABLE_LEVEL) {
- printk(KERN_ERR "audit: (%s) error: unsync sp: %p level = %d\n",
- audit_msg, sp, level);
- return;
- }
-
- if (*sptep == shadow_notrap_nonpresent_pte) {
- printk(KERN_ERR "audit: (%s) error: notrap spte in unsync sp: %p\n",
- audit_msg, sp);
- return;
- }
- }
-
- if (sp->role.direct && *sptep == shadow_notrap_nonpresent_pte) {
- printk(KERN_ERR "audit: (%s) error: notrap spte in direct sp: %p\n",
- audit_msg, sp);
- return;
- }
-
- if (!is_shadow_present_pte(*sptep) ||
- !is_last_spte(*sptep, level))
- return;
-
- gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
- pfn = gfn_to_pfn_atomic(vcpu->kvm, gfn);
-
- if (is_error_pfn(pfn)) {
- kvm_release_pfn_clean(pfn);
- return;
- }
-
- hpa = pfn << PAGE_SHIFT;
-
- if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)
- printk(KERN_ERR "xx audit error: (%s) levels %d"
- " gva %lx pfn %llx hpa %llx ent %llxn",
- audit_msg, vcpu->arch.mmu.root_level,
- va, pfn, hpa, *sptep);
- }
-}
-
-static void audit_mappings(struct kvm_vcpu *vcpu)
-{
- unsigned i;
-
- if (vcpu->arch.mmu.root_level == 4)
- audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4);
- else
- for (i = 0; i < 4; ++i)
- if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK)
- audit_mappings_page(vcpu,
- vcpu->arch.mmu.pae_root[i],
- i << 30,
- 2);
-}
-
-void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
-{
- unsigned long *rmapp;
- struct kvm_mmu_page *rev_sp;
- gfn_t gfn;
-
-
- rev_sp = page_header(__pa(sptep));
- gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
-
- if (!gfn_to_memslot(kvm, gfn)) {
- if (!printk_ratelimit())
- return;
- printk(KERN_ERR "%s: no memslot for gfn %llx\n",
- audit_msg, gfn);
- printk(KERN_ERR "%s: index %ld of sp (gfn=%llx)\n",
- audit_msg, (long int)(sptep - rev_sp->spt),
- rev_sp->gfn);
- dump_stack();
- return;
- }
-
- rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);
- if (!*rmapp) {
- if (!printk_ratelimit())
- return;
- printk(KERN_ERR "%s: no rmap for writable spte %llx\n",
- audit_msg, *sptep);
- dump_stack();
- }
-}
-
-void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu)
-{
- mmu_spte_walk(vcpu, inspect_spte_has_rmap);
-}
-
-static void check_mappings_rmap(struct kvm_vcpu *vcpu)
-{
- struct kvm_mmu_page *sp;
- int i;
-
- list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
- u64 *pt = sp->spt;
-
- if (sp->role.level != PT_PAGE_TABLE_LEVEL)
- continue;
-
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- if (!is_rmap_spte(pt[i]))
- continue;
-
- inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
- }
- }
- return;
-}
-
-static void audit_rmap(struct kvm_vcpu *vcpu)
-{
- check_mappings_rmap(vcpu);
-}
-
-static void audit_write_protection(struct kvm_vcpu *vcpu)
-{
- struct kvm_mmu_page *sp;
- struct kvm_memory_slot *slot;
- unsigned long *rmapp;
- u64 *spte;
-
- list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
- if (sp->role.direct)
- continue;
- if (sp->unsync)
- continue;
- if (sp->role.invalid)
- continue;
-
- slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
- rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
-
- spte = rmap_next(vcpu->kvm, rmapp, NULL);
- while (spte) {
- if (is_writable_pte(*spte))
- printk(KERN_ERR "%s: (%s) shadow page has "
- "writable mappings: gfn %llx role %x\n",
- __func__, audit_msg, sp->gfn,
- sp->role.word);
- spte = rmap_next(vcpu->kvm, rmapp, spte);
- }
- }
-}
-
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
-{
- int olddbg = dbg;
-
- dbg = 0;
- audit_msg = msg;
- audit_rmap(vcpu);
- audit_write_protection(vcpu);
- if (strcmp("pre pte write", audit_msg) != 0)
- audit_mappings(vcpu);
- audit_sptes_have_rmaps(vcpu);
- dbg = olddbg;
-}
-
+#ifdef CONFIG_KVM_MMU_DEBUG
+#include "mmu_debug.c"
#endif
diff --git a/arch/x86/kvm/mmu_debug.c b/arch/x86/kvm/mmu_debug.c
new file mode 100644
index 0000000..d2c0048
--- /dev/null
+++ b/arch/x86/kvm/mmu_debug.c
@@ -0,0 +1,329 @@
+/*
+ * mmu_debug.c:
+ *
+ * Debug code for KVM MMU
+ *
+ * Copyright (C) 2006 Qumranet, Inc.
+ * Copyright 2010 Red Hat, Inc. and/or its affilates.
+ *
+ * Authors:
+ * Yaniv Kamay <yaniv@xxxxxxxxxxxx>
+ * Avi Kivity <avi@xxxxxxxxxxxx>
+ * Marcelo Tosatti <mtosatti@xxxxxxxxxx>
+ * Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/debugfs.h>
+
+static struct dentry *debugfs_file;
+static bool mmu_debug;
+
+static const char *audit_msg;
+
+typedef void (*inspect_spte_fn) (struct kvm *kvm, u64 *sptep);
+
+static void __mmu_spte_walk(struct kvm *kvm, struct kvm_mmu_page *sp,
+ inspect_spte_fn fn)
+{
+ int i;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ u64 ent = sp->spt[i];
+
+ if (is_shadow_present_pte(ent)) {
+ if (!is_last_spte(ent, sp->role.level)) {
+ struct kvm_mmu_page *child;
+ child = page_header(ent & PT64_BASE_ADDR_MASK);
+ __mmu_spte_walk(kvm, child, fn);
+ } else
+ fn(kvm, &sp->spt[i]);
+ }
+ }
+}
+
+static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
+{
+ int i;
+ struct kvm_mmu_page *sp;
+
+ if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
+ return;
+ if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+ hpa_t root = vcpu->arch.mmu.root_hpa;
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu->kvm, sp, fn);
+ return;
+ }
+ for (i = 0; i < 4; ++i) {
+ hpa_t root = vcpu->arch.mmu.pae_root[i];
+
+ if (root && VALID_PAGE(root)) {
+ root &= PT64_BASE_ADDR_MASK;
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu->kvm, sp, fn);
+ }
+ }
+ return;
+}
+
+static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
+ gva_t va, int level)
+{
+ u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK);
+ int i;
+ gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1));
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
+ u64 *sptep = pt + i;
+ struct kvm_mmu_page *sp;
+ gfn_t gfn;
+ pfn_t pfn;
+ hpa_t hpa;
+
+ sp = page_header(__pa(sptep));
+
+ if (sp->unsync) {
+ if (level != PT_PAGE_TABLE_LEVEL) {
+ printk(KERN_ERR "audit: (%s) error: unsync sp: %p level = %d\n",
+ audit_msg, sp, level);
+ return;
+ }
+
+ if (*sptep == shadow_notrap_nonpresent_pte) {
+ printk(KERN_ERR "audit: (%s) error: notrap spte in unsync sp: %p\n",
+ audit_msg, sp);
+ return;
+ }
+ }
+
+ if (sp->role.direct && *sptep == shadow_notrap_nonpresent_pte) {
+ printk(KERN_ERR "audit: (%s) error: notrap spte in direct sp: %p\n",
+ audit_msg, sp);
+ return;
+ }
+
+ if (!is_shadow_present_pte(*sptep) ||
+ !is_last_spte(*sptep, level))
+ return;
+
+ gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
+ pfn = gfn_to_pfn_atomic(vcpu->kvm, gfn);
+
+ if (is_error_pfn(pfn)) {
+ kvm_release_pfn_clean(pfn);
+ return;
+ }
+
+ hpa = pfn << PAGE_SHIFT;
+
+ if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)
+ printk(KERN_ERR "xx audit error: (%s) levels %d"
+ " gva %lx pfn %llx hpa %llx ent %llxn",
+ audit_msg, vcpu->arch.mmu.root_level,
+ va, pfn, hpa, *sptep);
+ }
+}
+
+static void audit_mappings(struct kvm_vcpu *vcpu)
+{
+ unsigned i;
+
+ if (vcpu->arch.mmu.root_level == 4)
+ audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4);
+ else
+ for (i = 0; i < 4; ++i)
+ if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK)
+ audit_mappings_page(vcpu,
+ vcpu->arch.mmu.pae_root[i],
+ i << 30,
+ 2);
+}
+
+void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
+{
+ unsigned long *rmapp;
+ struct kvm_mmu_page *rev_sp;
+ gfn_t gfn;
+
+
+ rev_sp = page_header(__pa(sptep));
+ gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
+
+ if (!gfn_to_memslot(kvm, gfn)) {
+ if (!printk_ratelimit())
+ return;
+ printk(KERN_ERR "%s: no memslot for gfn %llx\n",
+ audit_msg, gfn);
+ printk(KERN_ERR "%s: index %ld of sp (gfn=%llx)\n",
+ audit_msg, (long int)(sptep - rev_sp->spt),
+ rev_sp->gfn);
+ dump_stack();
+ return;
+ }
+
+ rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);
+ if (!*rmapp) {
+ if (!printk_ratelimit())
+ return;
+ printk(KERN_ERR "%s: no rmap for writable spte %llx\n",
+ audit_msg, *sptep);
+ dump_stack();
+ }
+}
+
+void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu)
+{
+ mmu_spte_walk(vcpu, inspect_spte_has_rmap);
+}
+
+static void check_mappings_rmap(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu_page *sp;
+ int i;
+
+ list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
+ u64 *pt = sp->spt;
+
+ if (sp->role.level != PT_PAGE_TABLE_LEVEL)
+ continue;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ if (!is_rmap_spte(pt[i]))
+ continue;
+
+ inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
+ }
+ }
+ return;
+}
+
+static void audit_rmap(struct kvm_vcpu *vcpu)
+{
+ check_mappings_rmap(vcpu);
+}
+
+static void audit_write_protection(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu_page *sp;
+ struct kvm_memory_slot *slot;
+ unsigned long *rmapp;
+ u64 *spte;
+
+ list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
+ if (sp->role.direct)
+ continue;
+ if (sp->unsync)
+ continue;
+ if (sp->role.invalid)
+ continue;
+
+ slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
+ rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
+
+ spte = rmap_next(vcpu->kvm, rmapp, NULL);
+ while (spte) {
+ if (is_writable_pte(*spte))
+ printk(KERN_ERR "%s: (%s) shadow page has "
+ "writable mappings: gfn %llx role %x\n",
+ __func__, audit_msg, sp->gfn,
+ sp->role.word);
+ spte = rmap_next(vcpu->kvm, rmapp, spte);
+ }
+ }
+}
+
+static void kvm_mmu_audit(void *ignore, struct kvm_vcpu *vcpu, const char *msg)
+{
+ audit_msg = msg;
+ audit_rmap(vcpu);
+ audit_write_protection(vcpu);
+ if (strcmp("pre pte write", audit_msg) != 0)
+ audit_mappings(vcpu);
+ audit_sptes_have_rmaps(vcpu);
+}
+
+static void mmu_debug_enable(void)
+{
+ int ret;
+
+ if (mmu_debug)
+ return;
+
+ ret = register_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
+ WARN_ON(ret);
+
+ mmu_debug = true;
+}
+
+static void mmu_debug_disable(void)
+{
+ if (!mmu_debug)
+ return;
+
+ unregister_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
+ tracepoint_synchronize_unregister();
+ mmu_debug = false;
+}
+
+static ssize_t mmu_debug_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64];
+ unsigned long val;
+ int ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ switch (val) {
+ case 0:
+ mmu_debug_disable();
+ break;
+ case 1:
+ mmu_debug_enable();
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return cnt;
+}
+
+static ssize_t mmu_debug_read(struct file *filp, char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ char buf[64];
+ int r;
+
+ r = sprintf(buf, "%d\n", mmu_debug);
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static const struct file_operations mmu_debug_ops = {
+ .write = mmu_debug_write,
+ .read = mmu_debug_read,
+};
+
+void mmu_debug_init(void)
+{
+ debugfs_file = debugfs_create_file("mmu-debug", 0644, kvm_debugfs_dir,
+ NULL, &mmu_debug_ops);
+}
+
+void mmu_debug_cleanup(void)
+{
+ debugfs_remove(debugfs_file);
+}
diff --git a/arch/x86/kvm/mmu_debug.h b/arch/x86/kvm/mmu_debug.h
new file mode 100644
index 0000000..23f634f
--- /dev/null
+++ b/arch/x86/kvm/mmu_debug.h
@@ -0,0 +1,12 @@
+#ifndef _LINUX_MMU_DEBUG_H
+#define _LINUX_MMU_DEBUG_H
+
+#ifdef CONFIG_KVM_MMU_DEBUG
+void mmu_debug_init(void);
+void mmu_debug_cleanup(void);
+#else
+static inline void mmu_debug_init(void) {};
+static inline void mmu_debug_cleanup(void) {};
+#endif
+
+#endif
diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 3aab0f0..28a0e1f 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -195,6 +195,25 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,

TP_ARGS(sp)
);
+
+TRACE_EVENT(
+ kvm_mmu_audit,
+ TP_PROTO(struct kvm_vcpu *vcpu, const char *msg),
+ TP_ARGS(vcpu, msg),
+
+ TP_STRUCT__entry(
+ __field(struct kvm_vcpu *, vcpu)
+ __field(const char *, msg)
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu = vcpu;
+ __entry->msg = msg;
+ ),
+
+ TP_printk("%s", __entry->msg)
+);
+
#endif /* _TRACE_KVMMMU_H */

#undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index a0f2feb..d6f348b 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -542,7 +542,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
if (mmu_notifier_retry(vcpu, mmu_seq))
goto out_unlock;

- kvm_mmu_audit(vcpu, "pre page fault");
+ trace_kvm_mmu_audit(vcpu, "pre page fault");
kvm_mmu_free_some_pages(vcpu);
sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
level, &write_pt, pfn);
@@ -554,7 +554,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */

++vcpu->stat.pf_fixed;
- kvm_mmu_audit(vcpu, "post page fault (fixed)");
+ trace_kvm_mmu_audit(vcpu, "post page fault (fixed)");
spin_unlock(&vcpu->kvm->mmu_lock);

return write_pt;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9a73b98..cc7b624 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2262,6 +2262,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
int r;
int cpu;

+ kvm_init_debug();
+
r = kvm_arch_init(opaque);
if (r)
goto out_fail;
@@ -2346,8 +2348,6 @@ 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();
-
return 0;

out_free:
@@ -2379,7 +2379,6 @@ EXPORT_SYMBOL_GPL(kvm_init);

void kvm_exit(void)
{
- kvm_exit_debug();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
sysdev_unregister(&kvm_sysdev);
@@ -2389,6 +2388,7 @@ void kvm_exit(void)
on_each_cpu(hardware_disable, NULL, 1);
kvm_arch_hardware_unsetup();
kvm_arch_exit();
+ kvm_exit_debug();
free_cpumask_var(cpus_hardware_enabled);
__free_page(hwpoison_page);
__free_page(bad_page);
--
1.7.0.4

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