KVM: MMU: remove the redundant get_written_sptes

get_written_sptes is called twice in kvm_mmu_pte_write, one of them can be
removed

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9270e0d93c31..34da43086952 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3551,7 +3551,7 @@ static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa,
  * If we're seeing too many writes to a page, it may no longer be a page table,
  * or we may be forking, in which case it is better to unmap the page.
  */
-static bool detect_write_flooding(struct kvm_mmu_page *sp, u64 *spte)
+static bool detect_write_flooding(struct kvm_mmu_page *sp)
 {
         /*
          * Skip write-flooding detected for the sp whose level is 1, because
@@ -3660,10 +3660,8 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
 
         mask.cr0_wp = mask.cr4_pae = mask.nxe = 1;
         for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) {
-                spte = get_written_sptes(sp, gpa, &npte);
-
                 if (detect_write_misaligned(sp, gpa, bytes) ||
-                      detect_write_flooding(sp, spte)) {
+                      detect_write_flooding(sp)) {
                         zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp,
                                                      &invalid_list);
                         ++vcpu->kvm->stat.mmu_flooded;