KVM: x86/mmu: Reduce gfn range of tlb flushing in tdp_mmu_map_handle_target_level()

Since the children SP is zapped, the gfn range of tlb flushing should be
the range covered by children SP not parent SP. Replace sp->gfn which is
the base gfn of parent SP with iter->gfn and use the correct size of gfn
range for children SP to reduce tlb flushing range.

Fixes: bb95dfb9e2df ("KVM: x86/mmu: Defer TLB flush to caller when freeing TDP MMU shadow pages")
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/528ab9c784a486e9ce05f61462ad9260796a8732.1665214747.git.houwenlong.hwl@antgroup.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index bba33ae..ce2f86f 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1080,8 +1080,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
                return RET_PF_RETRY;
        else if (is_shadow_present_pte(iter->old_spte) &&
                 !is_last_spte(iter->old_spte, iter->level))
-               kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
-                                                  KVM_PAGES_PER_HPAGE(iter->level + 1));
+               kvm_flush_remote_tlbs_gfn(vcpu->kvm, iter->gfn, iter->level);
 
        /*
         * If the page fault was caused by a write but the page is write