KVM: s390: Use kvm_release_page_dirty() to unpin "struct page" memory

Use kvm_release_page_dirty() when unpinning guest pages, as the pfn was
retrieved via pin_guest_page(), i.e. is guaranteed to be backed by struct
page memory.  This will allow dropping kvm_release_pfn_dirty() and
friends.

Signed-off-by: Sean Christopherson <[email protected]>
Tested-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Message-ID: <[email protected]>

Author: sean-jc

arch/s390/kvm/vsie.c

@@ -670,7 +670,7 @@ static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
 /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
 static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
 {
-	kvm_release_pfn_dirty(hpa >> PAGE_SHIFT);
+	kvm_release_page_dirty(pfn_to_page(hpa >> PAGE_SHIFT));
 	/* mark the page always as dirty for migration */
 	mark_page_dirty(kvm, gpa_to_gfn(gpa));
 }