KVM: x86/tdp_mmu: Merge prefetch and access checks for spurious faults

Combine prefetch and is_access_allowed() checks into a unified path to
detect spurious faults, since both cases now share identical logic.

No functional changes.

Signed-off-by: Yan Zhao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: yanzhao56

arch/x86/kvm/mmu/tdp_mmu.c

@@ -1153,12 +1153,8 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
 	if (WARN_ON_ONCE(sp->role.level != fault->goal_level))
 		return RET_PF_RETRY;
 
-	if (fault->prefetch && is_shadow_present_pte(iter->old_spte) &&
-	    is_last_spte(iter->old_spte, iter->level))
-		return RET_PF_SPURIOUS;
-
 	if (is_shadow_present_pte(iter->old_spte) &&
-	    is_access_allowed(fault, iter->old_spte) &&
+	    (fault->prefetch || is_access_allowed(fault, iter->old_spte)) &&
 	    is_last_spte(iter->old_spte, iter->level))
 		return RET_PF_SPURIOUS;