KVM: MMU: remove the redundant get_written_sptes
Xiao Guangrong [Fri, 16 Dec 2011 10:18:10 +0000 (18:18 +0800)]
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>

arch/x86/kvm/mmu.c

index 9270e0d..34da430 100644 (file)
@@ -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;