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KVM: MMU: introduce is_last_spte helper

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Hiding some of the last largepage / level interaction (which is useful
for gbpages and for zero based levels).

Also merge the PT_PAGE_TABLE_LEVEL clearing loop in unlink_children.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-06-10 12:27:03 -03:00 committed by Avi Kivity
parent 3f5d18a965
commit 776e663336
1 changed files with 13 additions and 13 deletions
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26
arch/x86/kvm/mmu.c
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@ -250,6 +250,15 @@ static int is_rmap_spte(u64 pte)
return is_shadow_present_pte(pte);
}
static int is_last_spte(u64 pte, int level)
{
if (level == PT_PAGE_TABLE_LEVEL)
return 1;
if (level == PT_DIRECTORY_LEVEL && is_large_pte(pte))
return 1;
return 0;
}
static pfn_t spte_to_pfn(u64 pte)
{
return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
@ -1313,25 +1322,17 @@ static void kvm_mmu_page_unlink_children(struct kvm *kvm,
pt = sp->spt;
if (sp->role.level == PT_PAGE_TABLE_LEVEL) {
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
if (is_shadow_present_pte(pt[i]))
rmap_remove(kvm, &pt[i]);
pt[i] = shadow_trap_nonpresent_pte;
}
return;
}
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
ent = pt[i];
if (is_shadow_present_pte(ent)) {
if (!is_large_pte(ent)) {
if (!is_last_spte(ent, sp->role.level)) {
ent &= PT64_BASE_ADDR_MASK;
mmu_page_remove_parent_pte(page_header(ent),
&pt[i]);
} else {
--kvm->stat.lpages;
if (is_large_pte(ent))
--kvm->stat.lpages;
rmap_remove(kvm, &pt[i]);
}
}
@ -2381,8 +2382,7 @@ static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
pte = *spte;
if (is_shadow_present_pte(pte)) {
if (sp->role.level == PT_PAGE_TABLE_LEVEL ||
is_large_pte(pte))
if (is_last_spte(pte, sp->role.level))
rmap_remove(vcpu->kvm, spte);
else {
child = page_header(pte & PT64_BASE_ADDR_MASK);