Commit 2f4f3372 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity

KVM: MMU: move audit to a separate file

Move the audit code from arch/x86/kvm/mmu.c to arch/x86/kvm/mmu_audit.c
Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 8b1fe17c
...@@ -3490,282 +3490,5 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) ...@@ -3490,282 +3490,5 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy);
#ifdef CONFIG_KVM_MMU_AUDIT #ifdef CONFIG_KVM_MMU_AUDIT
static const char *audit_msg; #include "mmu_audit.c"
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, int audit_point)
{
audit_msg = audit_point_name[audit_point];
audit_rmap(vcpu);
audit_write_protection(vcpu);
if (strcmp("pre pte write", audit_msg) != 0)
audit_mappings(vcpu);
audit_sptes_have_rmaps(vcpu);
}
static bool mmu_audit;
static void mmu_audit_enable(void)
{
int ret;
if (mmu_audit)
return;
ret = register_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
WARN_ON(ret);
mmu_audit = true;
}
static void mmu_audit_disable(void)
{
if (!mmu_audit)
return;
unregister_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
tracepoint_synchronize_unregister();
mmu_audit = false;
}
static int mmu_audit_set(const char *val, const struct kernel_param *kp)
{
int ret;
unsigned long enable;
ret = strict_strtoul(val, 10, &enable);
if (ret < 0)
return -EINVAL;
switch (enable) {
case 0:
mmu_audit_disable();
break;
case 1:
mmu_audit_enable();
break;
default:
return -EINVAL;
}
return 0;
}
static struct kernel_param_ops audit_param_ops = {
.set = mmu_audit_set,
.get = param_get_bool,
};
module_param_cb(mmu_audit, &audit_param_ops, &mmu_audit, 0644);
#endif #endif
/*
* mmu_audit.c:
*
* Audit code for KVM MMU
*
* Copyright (C) 2006 Qumranet, Inc.
* Copyright 2010 Red Hat, Inc. and/or its affilates.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
* Avi Kivity <avi@qumranet.com>
* Marcelo Tosatti <mtosatti@redhat.com>
* Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
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, int audit_point)
{
audit_msg = audit_point_name[audit_point];
audit_rmap(vcpu);
audit_write_protection(vcpu);
if (strcmp("pre pte write", audit_msg) != 0)
audit_mappings(vcpu);
audit_sptes_have_rmaps(vcpu);
}
static bool mmu_audit;
static void mmu_audit_enable(void)
{
int ret;
if (mmu_audit)
return;
ret = register_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
WARN_ON(ret);
mmu_audit = true;
}
static void mmu_audit_disable(void)
{
if (!mmu_audit)
return;
unregister_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
tracepoint_synchronize_unregister();
mmu_audit = false;
}
static int mmu_audit_set(const char *val, const struct kernel_param *kp)
{
int ret;
unsigned long enable;
ret = strict_strtoul(val, 10, &enable);
if (ret < 0)
return -EINVAL;
switch (enable) {
case 0:
mmu_audit_disable();
break;
case 1:
mmu_audit_enable();
break;
default:
return -EINVAL;
}
return 0;
}
static struct kernel_param_ops audit_param_ops = {
.set = mmu_audit_set,
.get = param_get_bool,
};
module_param_cb(mmu_audit, &audit_param_ops, &mmu_audit, 0644);
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