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KVM: MMU: check rmap for every spte 

The read-only spte also has reverse mapping, so fix the code to check them,
also modify the function name to fit its doing

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-08-28 19:20:47 +08:00 committed by Avi Kivity
parent 9ad17b1001
commit 0beb8d6604
1 changed files with 26 additions and 31 deletions
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57
arch/x86/kvm/mmu.c
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@ -3644,40 +3644,38 @@ void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
struct kvm_mmu_page *rev_sp;
gfn_t gfn;
if (is_writable_pte(*sptep)) {
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();
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;
}
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();
}
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_writable_sptes_have_rmaps(struct kvm_vcpu *vcpu)
void audit_sptes_have_rmaps(struct kvm_vcpu *vcpu)
{
mmu_spte_walk(vcpu, inspect_spte_has_rmap);
}
static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
static void check_mappings_rmap(struct kvm_vcpu *vcpu)
{
struct kvm_mmu_page *sp;
int i;
@ -3689,12 +3687,9 @@ static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
continue;
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
u64 ent = pt[i];
if (!is_rmap_spte(pt[i]))
continue;
if (!(ent & PT_PRESENT_MASK))
continue;
if (!is_writable_pte(ent))
continue;
inspect_spte_has_rmap(vcpu->kvm, &pt[i]);
}
}
@ -3703,7 +3698,7 @@ static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
static void audit_rmap(struct kvm_vcpu *vcpu)
{
check_writable_mappings_rmap(vcpu);
check_mappings_rmap(vcpu);
count_rmaps(vcpu);
}
@ -3746,7 +3741,7 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
audit_write_protection(vcpu);
if (strcmp("pre pte write", audit_msg) != 0)
audit_mappings(vcpu);
audit_writable_sptes_have_rmaps(vcpu);
audit_sptes_have_rmaps(vcpu);
dbg = olddbg;
}