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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>
This commit is contained in:
Xiao Guangrong 2011-12-16 18:18:10 +08:00 committed by Avi Kivity
parent 6addd1aa2c
commit a138fe7535
1 changed files with 2 additions and 4 deletions
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6
arch/x86/kvm/mmu.c
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@ -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;