KVM: Drop APIs that manipulate "struct page" via pfns

Remove all kvm_{release,set}_pfn_*() APIs now that all users are gone.

No functional change intended.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-85-seanjc@google.com>

Author: sean-jc

include/linux/kvm_host.h

@@ -1274,11 +1274,6 @@ static inline kvm_pfn_t kvm_faultin_pfn(struct kvm_vcpu *vcpu, gfn_t gfn,
 				 write ? FOLL_WRITE : 0, writable, refcounted_page);
 }
 
-void kvm_release_pfn_clean(kvm_pfn_t pfn);
-void kvm_release_pfn_dirty(kvm_pfn_t pfn);
-void kvm_set_pfn_dirty(kvm_pfn_t pfn);
-void kvm_set_pfn_accessed(kvm_pfn_t pfn);
-
 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 			int len);
 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);

virt/kvm/kvm_main.c

@@ -3164,61 +3164,6 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map)
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
 
-void kvm_release_pfn_clean(kvm_pfn_t pfn)
-{
-	struct page *page;
-
-	if (is_error_noslot_pfn(pfn))
-		return;
-
-	page = kvm_pfn_to_refcounted_page(pfn);
-	if (!page)
-		return;
-
-	kvm_release_page_clean(page);
-}
-EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
-
-void kvm_release_pfn_dirty(kvm_pfn_t pfn)
-{
-	struct page *page;
-
-	if (is_error_noslot_pfn(pfn))
-		return;
-
-	page = kvm_pfn_to_refcounted_page(pfn);
-	if (!page)
-		return;
-
-	kvm_release_page_dirty(page);
-}
-EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
-
-/*
- * Note, checking for an error/noslot pfn is the caller's responsibility when
- * directly marking a page dirty/accessed.  Unlike the "release" helpers, the
- * "set" helpers are not to be used when the pfn might point at garbage.
- */
-void kvm_set_pfn_dirty(kvm_pfn_t pfn)
-{
-	if (WARN_ON(is_error_noslot_pfn(pfn)))
-		return;
-
-	if (pfn_valid(pfn))
-		kvm_set_page_dirty(pfn_to_page(pfn));
-}
-EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
-
-void kvm_set_pfn_accessed(kvm_pfn_t pfn)
-{
-	if (WARN_ON(is_error_noslot_pfn(pfn)))
-		return;
-
-	if (pfn_valid(pfn))
-		kvm_set_page_accessed(pfn_to_page(pfn));
-}
-EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
-
 static int next_segment(unsigned long len, int offset)
 {
 	if (len > PAGE_SIZE - offset)