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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/arch/x86/mm/pgtable.c
....@@ -3,7 +3,6 @@
33 #include <linux/gfp.h>
44 #include <linux/hugetlb.h>
55 #include <asm/pgalloc.h>
6
-#include <asm/pgtable.h>
76 #include <asm/tlb.h>
87 #include <asm/fixmap.h>
98 #include <asm/mtrr.h>
....@@ -13,33 +12,25 @@
1312 EXPORT_SYMBOL(physical_mask);
1413 #endif
1514 
16
-#define PGALLOC_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
17
-
1815 #ifdef CONFIG_HIGHPTE
19
-#define PGALLOC_USER_GFP __GFP_HIGHMEM
16
+#define PGTABLE_HIGHMEM __GFP_HIGHMEM
2017 #else
21
-#define PGALLOC_USER_GFP 0
18
+#define PGTABLE_HIGHMEM 0
2219 #endif
2320 
24
-gfp_t __userpte_alloc_gfp = PGALLOC_GFP | PGALLOC_USER_GFP;
25
-
26
-pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
21
+#ifndef CONFIG_PARAVIRT
22
+static inline
23
+void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
2724 {
28
-	return (pte_t *)__get_free_page(PGALLOC_GFP & ~__GFP_ACCOUNT);
25
+	tlb_remove_page(tlb, table);
2926 }
27
+#endif
3028 
31
-pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
29
+gfp_t __userpte_alloc_gfp = GFP_PGTABLE_USER | PGTABLE_HIGHMEM;
30
+
31
+pgtable_t pte_alloc_one(struct mm_struct *mm)
3232 {
33
-	struct page *pte;
34
-
35
-	pte = alloc_pages(__userpte_alloc_gfp, 0);
36
-	if (!pte)
37
-		return NULL;
38
-	if (!pgtable_page_ctor(pte)) {
39
-		__free_page(pte);
40
-		return NULL;
41
-	}
42
-	return pte;
33
+	return __pte_alloc_one(mm, __userpte_alloc_gfp);
4334 }
4435 
4536 static int __init setup_userpte(char *arg)
....@@ -61,7 +52,7 @@
6152 
6253 void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
6354 {
64
-	pgtable_page_dtor(pte);
55
+	pgtable_pte_page_dtor(pte);
6556 	paravirt_release_pte(page_to_pfn(pte));
6657 	paravirt_tlb_remove_table(tlb, pte);
6758 }
....@@ -190,7 +181,7 @@
190181  * when PTI is enabled. We need them to map the per-process LDT into the
191182  * user-space page-table.
192183  */
193
-#define PREALLOCATED_USER_PMDS	 (static_cpu_has(X86_FEATURE_PTI) ? \
184
+#define PREALLOCATED_USER_PMDS	 (boot_cpu_has(X86_FEATURE_PTI) ? \
194185 					KERNEL_PGD_PTRS : 0)
195186 #define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS
196187 
....@@ -235,7 +226,7 @@
235226 {
236227 	int i;
237228 	bool failed = false;
238
-	gfp_t gfp = PGALLOC_GFP;
229
+	gfp_t gfp = GFP_PGTABLE_USER;
239230 
240231 	if (mm == &init_mm)
241232 		gfp &= ~__GFP_ACCOUNT;
....@@ -292,7 +283,7 @@
292283 
293284 #ifdef CONFIG_PAGE_TABLE_ISOLATION
294285 
295
-	if (!static_cpu_has(X86_FEATURE_PTI))
286
+	if (!boot_cpu_has(X86_FEATURE_PTI))
296287 		return;
297288 
298289 	pgdp = kernel_to_user_pgdp(pgdp);
....@@ -373,14 +364,14 @@
373364 
374365 static struct kmem_cache *pgd_cache;
375366 
376
-static int __init pgd_cache_init(void)
367
+void __init pgtable_cache_init(void)
377368 {
378369 	/*
379370 	 * When PAE kernel is running as a Xen domain, it does not use
380371 	 * shared kernel pmd. And this requires a whole page for pgd.
381372 	 */
382373 	if (!SHARED_KERNEL_PMD)
383
-		return 0;
374
+		return;
384375 
385376 	/*
386377 	 * when PAE kernel is not running as a Xen domain, it uses
....@@ -390,9 +381,7 @@
390381 	 */
391382 	pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_ALIGN,
392383 				      SLAB_PANIC, NULL);
393
-	return 0;
394384 }
395
-core_initcall(pgd_cache_init);
396385 
397386 static inline pgd_t *_pgd_alloc(void)
398387 {
....@@ -401,14 +390,14 @@
401390 	 * We allocate one page for pgd.
402391 	 */
403392 	if (!SHARED_KERNEL_PMD)
404
-		return (pgd_t *)__get_free_pages(PGALLOC_GFP,
393
+		return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
405394 						 PGD_ALLOCATION_ORDER);
406395 
407396 	/*
408397 	 * Now PAE kernel is not running as a Xen domain. We can allocate
409398 	 * a 32-byte slab for pgd to save memory space.
410399 	 */
411
-	return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
400
+	return kmem_cache_alloc(pgd_cache, GFP_PGTABLE_USER);
412401 }
413402 
414403 static inline void _pgd_free(pgd_t *pgd)
....@@ -422,7 +411,8 @@
422411 
423412 static inline pgd_t *_pgd_alloc(void)
424413 {
425
-	return (pgd_t *)__get_free_pages(PGALLOC_GFP, PGD_ALLOCATION_ORDER);
414
+	return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
415
+					 PGD_ALLOCATION_ORDER);
426416 }
427417 
428418 static inline void _pgd_free(pgd_t *pgd)
....@@ -723,11 +713,9 @@
723713 	if (pud_present(*pud) && !pud_huge(*pud))
724714 		return 0;
725715 
726
-	prot = pgprot_4k_2_large(prot);
727
-
728716 	set_pte((pte_t *)pud, pfn_pte(
729717 		(u64)addr >> PAGE_SHIFT,
730
-		__pgprot(pgprot_val(prot) | _PAGE_PSE)));
718
+		__pgprot(protval_4k_2_large(pgprot_val(prot)) | _PAGE_PSE)));
731719 
732720 	return 1;
733721 }
....@@ -755,11 +743,9 @@
755743 	if (pmd_present(*pmd) && !pmd_huge(*pmd))
756744 		return 0;
757745 
758
-	prot = pgprot_4k_2_large(prot);
759
-
760746 	set_pte((pte_t *)pmd, pfn_pte(
761747 		(u64)addr >> PAGE_SHIFT,
762
-		__pgprot(pgprot_val(prot) | _PAGE_PSE)));
748
+		__pgprot(protval_4k_2_large(pgprot_val(prot)) | _PAGE_PSE)));
763749 
764750 	return 1;
765751 }
....@@ -794,6 +780,14 @@
794780 	return 0;
795781 }
796782 
783
+/*
784
+ * Until we support 512GB pages, skip them in the vmap area.
785
+ */
786
+int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
787
+{
788
+	return 0;
789
+}
790
+
797791 #ifdef CONFIG_X86_64
798792 /**
799793  * pud_free_pmd_page - Clear pud entry and free pmd page.
....@@ -810,9 +804,6 @@
810804 	pmd_t *pmd, *pmd_sv;
811805 	pte_t *pte;
812806 	int i;
813
-
814
-	if (pud_none(*pud))
815
-		return 1;
816807 
817808 	pmd = (pmd_t *)pud_page_vaddr(*pud);
818809 	pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
....@@ -856,9 +847,6 @@
856847 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
857848 {
858849 	pte_t *pte;
859
-
860
-	if (pmd_none(*pmd))
861
-		return 1;
862850 
863851 	pte = (pte_t *)pmd_page_vaddr(*pmd);
864852 	pmd_clear(pmd);