1 files changed, 0 insertions, 303 deletions
diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
deleted file mode 100644
index 9d2844f87f6d..000000000000
--- a/arch/x86/kvm/mmu_audit.c
+++ /dev/null
@@ -1,303 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * mmu_audit.c:
- *
- * Audit code for KVM MMU
- *
- * Copyright (C) 2006 Qumranet, Inc.
- * Copyright 2010 Red Hat, Inc. and/or its affiliates.
- *
- * Authors:
- *   Yaniv Kamay  <yaniv@qumranet.com>
- *   Avi Kivity   <avi@qumranet.com>
- *   Marcelo Tosatti <mtosatti@redhat.com>
- *   Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
- */
-
-#include <linux/ratelimit.h>
-
-static char const *audit_point_name[] = {
-	"pre page fault",
-	"post page fault",
-	"pre pte write",
-	"post pte write",
-	"pre sync",
-	"post sync"
-};
-
-#define audit_printk(kvm, fmt, args...)		\
-	printk(KERN_ERR "audit: (%s) error: "	\
-		fmt, audit_point_name[kvm->arch.audit_point], ##args)
-
-typedef void (*inspect_spte_fn) (struct kvm_vcpu *vcpu, u64 *sptep, int level);
-
-static void __mmu_spte_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
-			    inspect_spte_fn fn, int level)
-{
-	int i;
-
-	for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-		u64 *ent = sp->spt;
-
-		fn(vcpu, ent + i, level);
-
-		if (is_shadow_present_pte(ent[i]) &&
-		      !is_last_spte(ent[i], level)) {
-			struct kvm_mmu_page *child;
-
-			child = page_header(ent[i] & PT64_BASE_ADDR_MASK);
-			__mmu_spte_walk(vcpu, child, fn, level - 1);
-		}
-	}
-}
-
-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->root_level >= PT64_ROOT_4LEVEL) {
-		hpa_t root = vcpu->arch.mmu->root_hpa;
-
-		sp = page_header(root);
-		__mmu_spte_walk(vcpu, sp, fn, vcpu->arch.mmu->root_level);
-		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, sp, fn, 2);
-		}
-	}
-
-	return;
-}
-
-typedef void (*sp_handler) (struct kvm *kvm, struct kvm_mmu_page *sp);
-
-static void walk_all_active_sps(struct kvm *kvm, sp_handler fn)
-{
-	struct kvm_mmu_page *sp;
-
-	list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link)
-		fn(kvm, sp);
-}
-
-static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level)
-{
-	struct kvm_mmu_page *sp;
-	gfn_t gfn;
-	kvm_pfn_t pfn;
-	hpa_t hpa;
-
-	sp = page_header(__pa(sptep));
-
-	if (sp->unsync) {
-		if (level != PG_LEVEL_4K) {
-			audit_printk(vcpu->kvm, "unsync sp: %p "
-				     "level = %d\n", sp, level);
-			return;
-		}
-	}
-
-	if (!is_shadow_present_pte(*sptep) || !is_last_spte(*sptep, level))
-		return;
-
-	gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
-	pfn = kvm_vcpu_gfn_to_pfn_atomic(vcpu, gfn);
-
-	if (is_error_pfn(pfn))
-		return;
-
-	hpa =  pfn << PAGE_SHIFT;
-	if ((*sptep & PT64_BASE_ADDR_MASK) != hpa)
-		audit_printk(vcpu->kvm, "levels %d pfn %llx hpa %llx "
-			     "ent %llxn", vcpu->arch.mmu->root_level, pfn,
-			     hpa, *sptep);
-}
-
-static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
-{
-	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
-	struct kvm_rmap_head *rmap_head;
-	struct kvm_mmu_page *rev_sp;
-	struct kvm_memslots *slots;
-	struct kvm_memory_slot *slot;
-	gfn_t gfn;
-
-	rev_sp = page_header(__pa(sptep));
-	gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);
-
-	slots = kvm_memslots_for_spte_role(kvm, rev_sp->role);
-	slot = __gfn_to_memslot(slots, gfn);
-	if (!slot) {
-		if (!__ratelimit(&ratelimit_state))
-			return;
-		audit_printk(kvm, "no memslot for gfn %llx\n", gfn);
-		audit_printk(kvm, "index %ld of sp (gfn=%llx)\n",
-		       (long int)(sptep - rev_sp->spt), rev_sp->gfn);
-		dump_stack();
-		return;
-	}
-
-	rmap_head = __gfn_to_rmap(gfn, rev_sp->role.level, slot);
-	if (!rmap_head->val) {
-		if (!__ratelimit(&ratelimit_state))
-			return;
-		audit_printk(kvm, "no rmap for writable spte %llx\n",
-			     *sptep);
-		dump_stack();
-	}
-}
-
-static void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu, u64 *sptep, int level)
-{
-	if (is_shadow_present_pte(*sptep) && is_last_spte(*sptep, level))
-		inspect_spte_has_rmap(vcpu->kvm, sptep);
-}
-
-static void audit_spte_after_sync(struct kvm_vcpu *vcpu, u64 *sptep, int level)
-{
-	struct kvm_mmu_page *sp = page_header(__pa(sptep));
-
-	if (vcpu->kvm->arch.audit_point == AUDIT_POST_SYNC && sp->unsync)
-		audit_printk(vcpu->kvm, "meet unsync sp(%p) after sync "
-			     "root.\n", sp);
-}
-
-static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	int i;
-
-	if (sp->role.level != PG_LEVEL_4K)
-		return;
-
-	for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
-		if (!is_shadow_present_pte(sp->spt[i]))
-			continue;
-
-		inspect_spte_has_rmap(kvm, sp->spt + i);
-	}
-}
-
-static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	struct kvm_rmap_head *rmap_head;
-	u64 *sptep;
-	struct rmap_iterator iter;
-	struct kvm_memslots *slots;
-	struct kvm_memory_slot *slot;
-
-	if (sp->role.direct || sp->unsync || sp->role.invalid)
-		return;
-
-	slots = kvm_memslots_for_spte_role(kvm, sp->role);
-	slot = __gfn_to_memslot(slots, sp->gfn);
-	rmap_head = __gfn_to_rmap(sp->gfn, PG_LEVEL_4K, slot);
-
-	for_each_rmap_spte(rmap_head, &iter, sptep) {
-		if (is_writable_pte(*sptep))
-			audit_printk(kvm, "shadow page has writable "
-				     "mappings: gfn %llx role %x\n",
-				     sp->gfn, sp->role.word);
-	}
-}
-
-static void audit_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	check_mappings_rmap(kvm, sp);
-	audit_write_protection(kvm, sp);
-}
-
-static void audit_all_active_sps(struct kvm *kvm)
-{
-	walk_all_active_sps(kvm, audit_sp);
-}
-
-static void audit_spte(struct kvm_vcpu *vcpu, u64 *sptep, int level)
-{
-	audit_sptes_have_rmaps(vcpu, sptep, level);
-	audit_mappings(vcpu, sptep, level);
-	audit_spte_after_sync(vcpu, sptep, level);
-}
-
-static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
-{
-	mmu_spte_walk(vcpu, audit_spte);
-}
-
-static bool mmu_audit;
-static struct static_key mmu_audit_key;
-
-static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
-{
-	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
-
-	if (!__ratelimit(&ratelimit_state))
-		return;
-
-	vcpu->kvm->arch.audit_point = point;
-	audit_all_active_sps(vcpu->kvm);
-	audit_vcpu_spte(vcpu);
-}
-
-static inline void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
-{
-	if (static_key_false((&mmu_audit_key)))
-		__kvm_mmu_audit(vcpu, point);
-}
-
-static void mmu_audit_enable(void)
-{
-	if (mmu_audit)
-		return;
-
-	static_key_slow_inc(&mmu_audit_key);
-	mmu_audit = true;
-}
-
-static void mmu_audit_disable(void)
-{
-	if (!mmu_audit)
-		return;
-
-	static_key_slow_dec(&mmu_audit_key);
-	mmu_audit = false;
-}
-
-static int mmu_audit_set(const char *val, const struct kernel_param *kp)
-{
-	int ret;
-	unsigned long enable;
-
-	ret = kstrtoul(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 const struct kernel_param_ops audit_param_ops = {
-	.set = mmu_audit_set,
-	.get = param_get_bool,
-};
-
-arch_param_cb(mmu_audit, &audit_param_ops, &mmu_audit, 0644);