KVM: x86/mmu: Fold all of make_spte()'s writable handling into one if-else

Now that make_spte() no longer uses a funky goto to bail out for a special
case of its unsync handling, combine all of the unsync vs. writable logic
into a single if-else statement.

No functional change intended.

Link: https://lore.kernel.org/r/20241011021051.1557902-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/mmu/spte.c

@@ -217,8 +217,6 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	spte |= (u64)pfn << PAGE_SHIFT;
 
 	if (pte_access & ACC_WRITE_MASK) {
-		spte |= PT_WRITABLE_MASK | shadow_mmu_writable_mask;
-
 		/*
 		 * Unsync shadow pages that are reachable by the new, writable
 		 * SPTE.  Write-protect the SPTE if the page can't be unsync'd,
@@ -233,16 +231,13 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 		 * guaranteed by both the shadow MMU and the TDP MMU.
 		 */
 		if ((!is_last_spte(old_spte, level) || !is_writable_pte(old_spte)) &&
-		    mmu_try_to_unsync_pages(vcpu->kvm, slot, gfn, synchronizing, prefetch)) {
+		    mmu_try_to_unsync_pages(vcpu->kvm, slot, gfn, synchronizing, prefetch))
 			wrprot = true;
-			pte_access &= ~ACC_WRITE_MASK;
-			spte &= ~(PT_WRITABLE_MASK | shadow_mmu_writable_mask);
-		}
+		else
+			spte |= PT_WRITABLE_MASK | shadow_mmu_writable_mask |
+				spte_shadow_dirty_mask(spte);
 	}
 
-	if (pte_access & ACC_WRITE_MASK)
-		spte |= spte_shadow_dirty_mask(spte);
-
 	if (prefetch && !synchronizing)
 		spte = mark_spte_for_access_track(spte);