[PATCH v2 02/22] KVM: MMU: do not update slot bitmap if spte is nonpresent

[Xiao Guangrong]

Set slot bitmap only if the spte is present

Signed-off-by: Xiao Guangrong <xiaoguangr...@cn.fujitsu.com>
---
 arch/x86/kvm/mmu.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f474e93..8316c2d 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -743,9 +743,6 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t 
gfn)
        struct kvm_mmu_page *sp;
        unsigned long *rmapp;
 
-       if (!is_rmap_spte(*spte))
-               return 0;
-
        sp = page_header(__pa(spte));
        kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
        rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
@@ -2087,11 +2084,13 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 
*sptep,
        if (!was_rmapped && is_large_pte(*sptep))
                ++vcpu->kvm->stat.lpages;
 
-       page_header_update_slot(vcpu->kvm, sptep, gfn);
-       if (!was_rmapped) {
-               rmap_count = rmap_add(vcpu, sptep, gfn);
-               if (rmap_count > RMAP_RECYCLE_THRESHOLD)
-                       rmap_recycle(vcpu, sptep, gfn);
+       if (is_shadow_present_pte(*sptep)) {
+               page_header_update_slot(vcpu->kvm, sptep, gfn);
+               if (!was_rmapped) {
+                       rmap_count = rmap_add(vcpu, sptep, gfn);
+                       if (rmap_count > RMAP_RECYCLE_THRESHOLD)
+                               rmap_recycle(vcpu, sptep, gfn);
+               }
        }
        kvm_release_pfn_clean(pfn);
        if (speculative) {
-- 
1.7.5.4

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