x86: implement the new page table range API

Add PFN_PTE_SHIFT and a noop update_mmu_cache_range().

Link: https://lkml.kernel.org/r/20230802151406.3735276-29-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Matthew Wilcox (Oracle)

arch/x86/include/asm/pgtable.h

@@ -185,6 +185,8 @@ static inline int pte_special(pte_t pte)
 
 static inline u64 protnone_mask(u64 val);
 
+#define PFN_PTE_SHIFT	PAGE_SHIFT
+
 static inline unsigned long pte_pfn(pte_t pte)
 {
 	phys_addr_t pfn = pte_val(pte);
@@ -1020,13 +1022,6 @@ static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
 	return res;
 }
 
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
-			      pte_t *ptep, pte_t pte)
-{
-	page_table_check_ptes_set(mm, ptep, pte, 1);
-	set_pte(ptep, pte);
-}
-
 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 			      pmd_t *pmdp, pmd_t pmd)
 {
@@ -1292,6 +1287,11 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
 		unsigned long addr, pte_t *ptep)
 {
 }
+static inline void update_mmu_cache_range(struct vm_fault *vmf,
+		struct vm_area_struct *vma, unsigned long addr,
+		pte_t *ptep, unsigned int nr)
+{
+}
 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmd)
 {