static int tdp_root_level __read_mostly;
static int max_tdp_level __read_mostly;
-enum {
- AUDIT_PRE_PAGE_FAULT,
- AUDIT_POST_PAGE_FAULT,
- AUDIT_PRE_PTE_WRITE,
- AUDIT_POST_PTE_WRITE,
- AUDIT_PRE_SYNC,
- AUDIT_POST_SYNC
-};
-
#ifdef MMU_DEBUG
bool dbg = 0;
module_param(dbg, bool, 0644);
return true;
}
-#ifdef CONFIG_KVM_MMU_AUDIT
-#include "mmu_audit.c"
-#else
-static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { }
-static void mmu_audit_disable(void) { }
-#endif
-
static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
{
if (sp->role.invalid)
return;
write_lock(&vcpu->kvm->mmu_lock);
- kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
-
mmu_sync_children(vcpu, sp, true);
-
- kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
write_unlock(&vcpu->kvm->mmu_lock);
return;
}
write_lock(&vcpu->kvm->mmu_lock);
- kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
for (i = 0; i < 4; ++i) {
hpa_t root = vcpu->arch.mmu->pae_root[i];
}
}
- kvm_mmu_audit(vcpu, AUDIT_POST_SYNC);
write_unlock(&vcpu->kvm->mmu_lock);
}
gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, &bytes);
++vcpu->kvm->stat.mmu_pte_write;
- kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE);
for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) {
if (detect_write_misaligned(sp, gpa, bytes) ||
}
}
kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, flush);
- kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE);
write_unlock(&vcpu->kvm->mmu_lock);
}
mmu_destroy_caches();
percpu_counter_destroy(&kvm_total_used_mmu_pages);
unregister_shrinker(&mmu_shrinker);
- mmu_audit_disable();
}
/*
+++ /dev/null
-// 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:
- */
-
-#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 = to_shadow_page(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 = to_shadow_page(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 (IS_VALID_PAE_ROOT(root)) {
- root &= PT64_BASE_ADDR_MASK;
- sp = to_shadow_page(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 = sptep_to_sp(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 = sptep_to_sp(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)
-{
- struct kvm_mmu_page *sp = sptep_to_sp(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);
-}
-
-static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
-{
- mmu_spte_walk(vcpu, audit_spte);
-}
-
-static bool mmu_audit;
-static DEFINE_STATIC_KEY_FALSE(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_branch_unlikely((&mmu_audit_key)))
- __kvm_mmu_audit(vcpu, point);
-}
-
-static void mmu_audit_enable(void)
-{
- if (mmu_audit)
- return;
-
- static_branch_inc(&mmu_audit_key);
- mmu_audit = true;
-}
-
-static void mmu_audit_disable(void)
-{
- if (!mmu_audit)
- return;
-
- static_branch_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);
projects / linux.git / commitdiff