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KVM: MMU: improve active sp audit 

Both audit_rmap() and audit_write_protection() need to walk all active sp, so
we can do these checking in a sp walking

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-08-30 18:25:03 +08:00 committed by Avi Kivity
parent 2f4f337248
commit 49edf87806
1 changed files with 38 additions and 36 deletions
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74
arch/x86/kvm/mmu_audit.c
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@ -65,6 +65,16 @@ static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
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_page(struct kvm_vcpu *vcpu, u64 page_pte,
gva_t va, int level)
{
@ -175,67 +185,59 @@ 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)
static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
{
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)
return;
if (sp->role.level != PT_PAGE_TABLE_LEVEL)
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
if (!is_rmap_spte(sp->spt[i]))
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]);
}
inspect_spte_has_rmap(kvm, sp->spt + i);
}
return;
}
static void audit_rmap(struct kvm_vcpu *vcpu)
void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
{
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;
if (sp->role.direct || sp->unsync || sp->role.invalid)
return;
slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
slot = gfn_to_memslot(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 "
spte = rmap_next(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);
}
spte = rmap_next(kvm, rmapp, spte);
}
}
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 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);
audit_all_active_sps(vcpu->kvm);
if (strcmp("pre pte write", audit_msg) != 0)
audit_mappings(vcpu);
audit_sptes_have_rmaps(vcpu);