[linux-2.6-block.git] / arch / s390 / mm / pageattr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2011
 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
 */
#include <linux/hugetlb.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
#include <asm/facility.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/set_memory.h>

static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
{
	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
		     : [addr] "+a" (addr) : [skey] "d" (skey));
	return addr;
}

void __storage_key_init_range(unsigned long start, unsigned long end)
{
	unsigned long boundary, size;

	if (!PAGE_DEFAULT_KEY)
		return;
	while (start < end) {
		if (MACHINE_HAS_EDAT1) {
			/* set storage keys for a 1MB frame */
			size = 1UL << 20;
			boundary = (start + size) & ~(size - 1);
			if (boundary <= end) {
				do {
					start = sske_frame(start, PAGE_DEFAULT_KEY);
				} while (start < boundary);
				continue;
			}
		}
		page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
		start += PAGE_SIZE;
	}
}

#ifdef CONFIG_PROC_FS
atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];

void arch_report_meminfo(struct seq_file *m)
{
	seq_printf(m, "DirectMap4k:    %8lu kB\n",
		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
	seq_printf(m, "DirectMap1M:    %8lu kB\n",
		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
	seq_printf(m, "DirectMap2G:    %8lu kB\n",
		   atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
}
#endif /* CONFIG_PROC_FS */

static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
		    unsigned long dtt)
{
	unsigned long table, mask;

	mask = 0;
	if (MACHINE_HAS_EDAT2) {
		switch (dtt) {
		case CRDTE_DTT_REGION3:
			mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
			break;
		case CRDTE_DTT_SEGMENT:
			mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
			break;
		case CRDTE_DTT_PAGE:
			mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
			break;
		}
		table = (unsigned long)old & mask;
		crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
	} else if (MACHINE_HAS_IDTE) {
		cspg(old, *old, new);
	} else {
		csp((unsigned int *)old + 1, *old, new);
	}
}

static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
			  unsigned long flags)
{
	pte_t *ptep, new;

	ptep = pte_offset(pmdp, addr);
	do {
		new = *ptep;
		if (pte_none(new))
			return -EINVAL;
		if (flags & SET_MEMORY_RO)
			new = pte_wrprotect(new);
		else if (flags & SET_MEMORY_RW)
			new = pte_mkwrite(pte_mkdirty(new));
		if (flags & SET_MEMORY_NX)
			pte_val(new) |= _PAGE_NOEXEC;
		else if (flags & SET_MEMORY_X)
			pte_val(new) &= ~_PAGE_NOEXEC;
		pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
		ptep++;
		addr += PAGE_SIZE;
		cond_resched();
	} while (addr < end);
	return 0;
}

static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
{
	unsigned long pte_addr, prot;
	pte_t *pt_dir, *ptep;
	pmd_t new;
	int i, ro, nx;

	pt_dir = vmem_pte_alloc();
	if (!pt_dir)
		return -ENOMEM;
	pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
	ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
	nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
	prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
	if (!nx)
		prot &= ~_PAGE_NOEXEC;
	ptep = pt_dir;
	for (i = 0; i < PTRS_PER_PTE; i++) {
		pte_val(*ptep) = pte_addr | prot;
		pte_addr += PAGE_SIZE;
		ptep++;
	}
	pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
	update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
	update_page_count(PG_DIRECT_MAP_1M, -1);
	return 0;
}

static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
			    unsigned long flags)
{
	pmd_t new = *pmdp;

	if (flags & SET_MEMORY_RO)
		new = pmd_wrprotect(new);
	else if (flags & SET_MEMORY_RW)
		new = pmd_mkwrite(pmd_mkdirty(new));
	if (flags & SET_MEMORY_NX)
		pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
	else if (flags & SET_MEMORY_X)
		pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
}

static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
			  unsigned long flags)
{
	unsigned long next;
	pmd_t *pmdp;
	int rc = 0;

	pmdp = pmd_offset(pudp, addr);
	do {
		if (pmd_none(*pmdp))
			return -EINVAL;
		next = pmd_addr_end(addr, end);
		if (pmd_large(*pmdp)) {
			if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
				rc = split_pmd_page(pmdp, addr);
				if (rc)
					return rc;
				continue;
			}
			modify_pmd_page(pmdp, addr, flags);
		} else {
			rc = walk_pte_level(pmdp, addr, next, flags);
			if (rc)
				return rc;
		}
		pmdp++;
		addr = next;
		cond_resched();
	} while (addr < end);
	return rc;
}

static int split_pud_page(pud_t *pudp, unsigned long addr)
{
	unsigned long pmd_addr, prot;
	pmd_t *pm_dir, *pmdp;
	pud_t new;
	int i, ro, nx;

	pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
	if (!pm_dir)
		return -ENOMEM;
	pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
	ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
	nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
	prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
	if (!nx)
		prot &= ~_SEGMENT_ENTRY_NOEXEC;
	pmdp = pm_dir;
	for (i = 0; i < PTRS_PER_PMD; i++) {
		pmd_val(*pmdp) = pmd_addr | prot;
		pmd_addr += PMD_SIZE;
		pmdp++;
	}
	pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
	update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
	update_page_count(PG_DIRECT_MAP_2G, -1);
	return 0;
}

static void modify_pud_page(pud_t *pudp, unsigned long addr,
			    unsigned long flags)
{
	pud_t new = *pudp;

	if (flags & SET_MEMORY_RO)
		new = pud_wrprotect(new);
	else if (flags & SET_MEMORY_RW)
		new = pud_mkwrite(pud_mkdirty(new));
	if (flags & SET_MEMORY_NX)
		pud_val(new) |= _REGION_ENTRY_NOEXEC;
	else if (flags & SET_MEMORY_X)
		pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
}

static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
			  unsigned long flags)
{
	unsigned long next;
	pud_t *pudp;
	int rc = 0;

	pudp = pud_offset(p4d, addr);
	do {
		if (pud_none(*pudp))
			return -EINVAL;
		next = pud_addr_end(addr, end);
		if (pud_large(*pudp)) {
			if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
				rc = split_pud_page(pudp, addr);
				if (rc)
					break;
				continue;
			}
			modify_pud_page(pudp, addr, flags);
		} else {
			rc = walk_pmd_level(pudp, addr, next, flags);
		}
		pudp++;
		addr = next;
		cond_resched();
	} while (addr < end && !rc);
	return rc;
}

static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
			  unsigned long flags)
{
	unsigned long next;
	p4d_t *p4dp;
	int rc = 0;

	p4dp = p4d_offset(pgd, addr);
	do {
		if (p4d_none(*p4dp))
			return -EINVAL;
		next = p4d_addr_end(addr, end);
		rc = walk_pud_level(p4dp, addr, next, flags);
		p4dp++;
		addr = next;
		cond_resched();
	} while (addr < end && !rc);
	return rc;
}

static DEFINE_MUTEX(cpa_mutex);

static int change_page_attr(unsigned long addr, unsigned long end,
			    unsigned long flags)
{
	unsigned long next;
	int rc = -EINVAL;
	pgd_t *pgdp;

	if (addr == end)
		return 0;
	if (end >= MODULES_END)
		return -EINVAL;
	mutex_lock(&cpa_mutex);
	pgdp = pgd_offset_k(addr);
	do {
		if (pgd_none(*pgdp))
			break;
		next = pgd_addr_end(addr, end);
		rc = walk_p4d_level(pgdp, addr, next, flags);
		if (rc)
			break;
		cond_resched();
	} while (pgdp++, addr = next, addr < end && !rc);
	mutex_unlock(&cpa_mutex);
	return rc;
}

int __set_memory(unsigned long addr, int numpages, unsigned long flags)
{
	if (!MACHINE_HAS_NX)
		flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
	if (!flags)
		return 0;
	addr &= PAGE_MASK;
	return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
}

#ifdef CONFIG_DEBUG_PAGEALLOC

static void ipte_range(pte_t *pte, unsigned long address, int nr)
{
	int i;

	if (test_facility(13)) {
		__ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
		return;
	}
	for (i = 0; i < nr; i++) {
		__ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
		address += PAGE_SIZE;
		pte++;
	}
}

void __kernel_map_pages(struct page *page, int numpages, int enable)
{
	unsigned long address;
	int nr, i, j;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	for (i = 0; i < numpages;) {
		address = page_to_phys(page + i);
		pgd = pgd_offset_k(address);
		p4d = p4d_offset(pgd, address);
		pud = pud_offset(p4d, address);
		pmd = pmd_offset(pud, address);
		pte = pte_offset_kernel(pmd, address);
		nr = (unsigned long)pte >> ilog2(sizeof(long));
		nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
		nr = min(numpages - i, nr);
		if (enable) {
			for (j = 0; j < nr; j++) {
				pte_val(*pte) &= ~_PAGE_INVALID;
				address += PAGE_SIZE;
				pte++;
			}
		} else {
			ipte_range(pte, address, nr);
		}
		i += nr;
	}
}

#ifdef CONFIG_HIBERNATION
bool kernel_page_present(struct page *page)
{
	unsigned long addr;
	int cc;

	addr = page_to_phys(page);
	asm volatile(
		"	lra	%1,0(%1)\n"
		"	ipm	%0\n"
		"	srl	%0,28"
		: "=d" (cc), "+a" (addr) : : "cc");
	return cc == 0;
}
#endif /* CONFIG_HIBERNATION */

#endif /* CONFIG_DEBUG_PAGEALLOC */
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
305b1523 JG	2	/*
	3	* Copyright IBM Corp. 2011
	4	* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
	5	*/
6b70a920	6	#include <linux/hugetlb.h>
305b1523	7	#include <linux/mm.h>
638ad34a	8	#include <asm/cacheflush.h>
cfb0b241	9	#include <asm/facility.h>
305b1523	10	#include <asm/pgtable.h>
a01ef308	11	#include <asm/pgalloc.h>
6b70a920	12	#include <asm/page.h>
e6c7c630	13	#include <asm/set_memory.h>
6b70a920	14
f7f8d7e5 HC	15	static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
	16	{
	17	asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
	18	: [addr] "+a" (addr) : [skey] "d" (skey));
	19	return addr;
	20	}
	21
127c1fef	22	void __storage_key_init_range(unsigned long start, unsigned long end)
6b70a920	23	{
f7f8d7e5	24	unsigned long boundary, size;
6b70a920	25
de3fa841 HC	26	if (!PAGE_DEFAULT_KEY)
de3fa841 HC	27	return;
6b70a920	28	while (start < end) {
6b70a920 HC	29	if (MACHINE_HAS_EDAT1) {
6b70a920 HC	30	/* set storage keys for a 1MB frame */
6b70a920 HC	31	size = 1UL << 20;
	32	boundary = (start + size) & ~(size - 1);
	33	if (boundary <= end) {
	34	do {
f7f8d7e5	35	start = sske_frame(start, PAGE_DEFAULT_KEY);
6b70a920 HC	36	} while (start < boundary);
	37	continue;
	38	}
	39	}
	40	page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
	41	start += PAGE_SIZE;
	42	}
	43	}
305b1523	44
37cd944c HC	45	#ifdef CONFIG_PROC_FS
	46	atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
	47
	48	void arch_report_meminfo(struct seq_file *m)
	49	{
	50	seq_printf(m, "DirectMap4k: %8lu kB\n",
	51	atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
	52	seq_printf(m, "DirectMap1M: %8lu kB\n",
	53	atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
	54	seq_printf(m, "DirectMap2G: %8lu kB\n",
	55	atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
	56	}
	57	#endif /* CONFIG_PROC_FS */
	58
e8a97e42 HC	59	static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
e8a97e42 HC	60	unsigned long dtt)
5b1ba9e3	61	{
e8a97e42 HC	62	unsigned long table, mask;
	63
	64	mask = 0;
	65	if (MACHINE_HAS_EDAT2) {
	66	switch (dtt) {
	67	case CRDTE_DTT_REGION3:
	68	mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
	69	break;
	70	case CRDTE_DTT_SEGMENT:
	71	mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
	72	break;
	73	case CRDTE_DTT_PAGE:
	74	mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
	75	break;
	76	}
	77	table = (unsigned long)old & mask;
	78	crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
	79	} else if (MACHINE_HAS_IDTE) {
	80	cspg(old, *old, new);
	81	} else {
	82	csp((unsigned int )old + 1, old, new);
	83	}
	84	}
	85
e8a97e42	86	static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
57d7f939	87	unsigned long flags)
e8a97e42 HC	88	{
	89	pte_t *ptep, new;
	90
	91	ptep = pte_offset(pmdp, addr);
	92	do {
57d7f939 MS	93	new = *ptep;
57d7f939 MS	94	if (pte_none(new))
e8a97e42	95	return -EINVAL;
57d7f939 MS	96	if (flags & SET_MEMORY_RO)
	97	new = pte_wrprotect(new);
	98	else if (flags & SET_MEMORY_RW)
	99	new = pte_mkwrite(pte_mkdirty(new));
1366def3	100	if (flags & SET_MEMORY_NX)
57d7f939 MS	101	pte_val(new) \|= _PAGE_NOEXEC;
	102	else if (flags & SET_MEMORY_X)
	103	pte_val(new) &= ~_PAGE_NOEXEC;
e8a97e42 HC	104	pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
	105	ptep++;
	106	addr += PAGE_SIZE;
	107	cond_resched();
	108	} while (addr < end);
	109	return 0;
	110	}
	111
	112	static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
	113	{
	114	unsigned long pte_addr, prot;
	115	pte_t pt_dir, ptep;
	116	pmd_t new;
57d7f939	117	int i, ro, nx;
e8a97e42 HC	118
	119	pt_dir = vmem_pte_alloc();
	120	if (!pt_dir)
	121	return -ENOMEM;
	122	pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
	123	ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
57d7f939	124	nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
e8a97e42	125	prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
57d7f939 MS	126	if (!nx)
57d7f939 MS	127	prot &= ~_PAGE_NOEXEC;
e8a97e42 HC	128	ptep = pt_dir;
	129	for (i = 0; i < PTRS_PER_PTE; i++) {
	130	pte_val(*ptep) = pte_addr \| prot;
	131	pte_addr += PAGE_SIZE;
	132	ptep++;
	133	}
	134	pmd_val(new) = __pa(pt_dir) \| _SEGMENT_ENTRY;
	135	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
37cd944c HC	136	update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
37cd944c HC	137	update_page_count(PG_DIRECT_MAP_1M, -1);
e8a97e42 HC	138	return 0;
	139	}
	140
57d7f939 MS	141	static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
57d7f939 MS	142	unsigned long flags)
e8a97e42	143	{
57d7f939 MS	144	pmd_t new = *pmdp;
	145
	146	if (flags & SET_MEMORY_RO)
	147	new = pmd_wrprotect(new);
	148	else if (flags & SET_MEMORY_RW)
	149	new = pmd_mkwrite(pmd_mkdirty(new));
1366def3	150	if (flags & SET_MEMORY_NX)
57d7f939 MS	151	pmd_val(new) \|= _SEGMENT_ENTRY_NOEXEC;
	152	else if (flags & SET_MEMORY_X)
	153	pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
e8a97e42 HC	154	pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
	155	}
	156
	157	static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
57d7f939	158	unsigned long flags)
e8a97e42 HC	159	{
e8a97e42 HC	160	unsigned long next;
5b1ba9e3	161	pmd_t *pmdp;
e8a97e42	162	int rc = 0;
5b1ba9e3	163
5b1ba9e3	164	pmdp = pmd_offset(pudp, addr);
e8a97e42 HC	165	do {
	166	if (pmd_none(*pmdp))
	167	return -EINVAL;
	168	next = pmd_addr_end(addr, end);
	169	if (pmd_large(*pmdp)) {
	170	if (addr & ~PMD_MASK \|\| addr + PMD_SIZE > next) {
	171	rc = split_pmd_page(pmdp, addr);
	172	if (rc)
	173	return rc;
	174	continue;
	175	}
57d7f939	176	modify_pmd_page(pmdp, addr, flags);
e8a97e42	177	} else {
57d7f939	178	rc = walk_pte_level(pmdp, addr, next, flags);
e8a97e42 HC	179	if (rc)
	180	return rc;
	181	}
	182	pmdp++;
	183	addr = next;
	184	cond_resched();
	185	} while (addr < end);
	186	return rc;
5b1ba9e3 HC	187	}
5b1ba9e3 HC	188
e8a97e42	189	static int split_pud_page(pud_t *pudp, unsigned long addr)
305b1523	190	{
e8a97e42 HC	191	unsigned long pmd_addr, prot;
	192	pmd_t pm_dir, pmdp;
	193	pud_t new;
57d7f939	194	int i, ro, nx;
305b1523	195
a01ef308	196	pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
e8a97e42 HC	197	if (!pm_dir)
	198	return -ENOMEM;
	199	pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
	200	ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
57d7f939	201	nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
e8a97e42	202	prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
57d7f939 MS	203	if (!nx)
57d7f939 MS	204	prot &= ~_SEGMENT_ENTRY_NOEXEC;
e8a97e42 HC	205	pmdp = pm_dir;
	206	for (i = 0; i < PTRS_PER_PMD; i++) {
	207	pmd_val(*pmdp) = pmd_addr \| prot;
	208	pmd_addr += PMD_SIZE;
	209	pmdp++;
305b1523	210	}
e8a97e42 HC	211	pud_val(new) = __pa(pm_dir) \| _REGION3_ENTRY;
e8a97e42 HC	212	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
37cd944c HC	213	update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
37cd944c HC	214	update_page_count(PG_DIRECT_MAP_2G, -1);
e8a97e42 HC	215	return 0;
	216	}
	217
57d7f939 MS	218	static void modify_pud_page(pud_t *pudp, unsigned long addr,
57d7f939 MS	219	unsigned long flags)
e8a97e42	220	{
57d7f939 MS	221	pud_t new = *pudp;
	222
	223	if (flags & SET_MEMORY_RO)
	224	new = pud_wrprotect(new);
	225	else if (flags & SET_MEMORY_RW)
	226	new = pud_mkwrite(pud_mkdirty(new));
1366def3	227	if (flags & SET_MEMORY_NX)
57d7f939 MS	228	pud_val(new) \|= _REGION_ENTRY_NOEXEC;
	229	else if (flags & SET_MEMORY_X)
	230	pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
e8a97e42 HC	231	pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
	232	}
	233
1aea9b3f	234	static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
57d7f939	235	unsigned long flags)
e8a97e42 HC	236	{
	237	unsigned long next;
	238	pud_t *pudp;
	239	int rc = 0;
	240
1aea9b3f	241	pudp = pud_offset(p4d, addr);
e8a97e42 HC	242	do {
	243	if (pud_none(*pudp))
	244	return -EINVAL;
	245	next = pud_addr_end(addr, end);
	246	if (pud_large(*pudp)) {
	247	if (addr & ~PUD_MASK \|\| addr + PUD_SIZE > next) {
	248	rc = split_pud_page(pudp, addr);
	249	if (rc)
	250	break;
	251	continue;
	252	}
57d7f939	253	modify_pud_page(pudp, addr, flags);
e8a97e42	254	} else {
57d7f939	255	rc = walk_pmd_level(pudp, addr, next, flags);
e8a97e42 HC	256	}
	257	pudp++;
	258	addr = next;
	259	cond_resched();
	260	} while (addr < end && !rc);
	261	return rc;
	262	}
	263
1aea9b3f MS	264	static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
	265	unsigned long flags)
	266	{
	267	unsigned long next;
	268	p4d_t *p4dp;
	269	int rc = 0;
	270
	271	p4dp = p4d_offset(pgd, addr);
	272	do {
	273	if (p4d_none(*p4dp))
	274	return -EINVAL;
	275	next = p4d_addr_end(addr, end);
	276	rc = walk_pud_level(p4dp, addr, next, flags);
	277	p4dp++;
	278	addr = next;
	279	cond_resched();
	280	} while (addr < end && !rc);
	281	return rc;
	282	}
	283
e8a97e42 HC	284	static DEFINE_MUTEX(cpa_mutex);
	285
	286	static int change_page_attr(unsigned long addr, unsigned long end,
57d7f939	287	unsigned long flags)
e8a97e42 HC	288	{
	289	unsigned long next;
	290	int rc = -EINVAL;
	291	pgd_t *pgdp;
	292
4d81aaa5 HC	293	if (addr == end)
4d81aaa5 HC	294	return 0;
e8a97e42 HC	295	if (end >= MODULES_END)
	296	return -EINVAL;
	297	mutex_lock(&cpa_mutex);
	298	pgdp = pgd_offset_k(addr);
	299	do {
	300	if (pgd_none(*pgdp))
	301	break;
	302	next = pgd_addr_end(addr, end);
1aea9b3f	303	rc = walk_p4d_level(pgdp, addr, next, flags);
e8a97e42 HC	304	if (rc)
	305	break;
	306	cond_resched();
	307	} while (pgdp++, addr = next, addr < end && !rc);
	308	mutex_unlock(&cpa_mutex);
	309	return rc;
305b1523 JG	310	}
305b1523 JG	311
57d7f939	312	int __set_memory(unsigned long addr, int numpages, unsigned long flags)
305b1523	313	{
1366def3 HC	314	if (!MACHINE_HAS_NX)
	315	flags &= ~(SET_MEMORY_NX \| SET_MEMORY_X);
	316	if (!flags)
	317	return 0;
e8a97e42	318	addr &= PAGE_MASK;
57d7f939	319	return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
448694a1	320	}
0a4ccc99 HC	321
0a4ccc99 HC	322	#ifdef CONFIG_DEBUG_PAGEALLOC
cfb0b241 HC	323
	324	static void ipte_range(pte_t *pte, unsigned long address, int nr)
	325	{
	326	int i;
	327
5a79859a	328	if (test_facility(13)) {
34eeaf37	329	__ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
cfb0b241 HC	330	return;
	331	}
	332	for (i = 0; i < nr; i++) {
28c807e5	333	__ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
cfb0b241 HC	334	address += PAGE_SIZE;
	335	pte++;
	336	}
	337	}
	338
031bc574	339	void __kernel_map_pages(struct page *page, int numpages, int enable)
0a4ccc99 HC	340	{
0a4ccc99 HC	341	unsigned long address;
cfb0b241	342	int nr, i, j;
0a4ccc99	343	pgd_t *pgd;
1aea9b3f	344	p4d_t *p4d;
0a4ccc99 HC	345	pud_t *pud;
	346	pmd_t *pmd;
	347	pte_t *pte;
0a4ccc99	348
cfb0b241	349	for (i = 0; i < numpages;) {
0a4ccc99 HC	350	address = page_to_phys(page + i);
0a4ccc99 HC	351	pgd = pgd_offset_k(address);
1aea9b3f MS	352	p4d = p4d_offset(pgd, address);
1aea9b3f MS	353	pud = pud_offset(p4d, address);
0a4ccc99 HC	354	pmd = pmd_offset(pud, address);
0a4ccc99 HC	355	pte = pte_offset_kernel(pmd, address);
cfb0b241 HC	356	nr = (unsigned long)pte >> ilog2(sizeof(long));
	357	nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
	358	nr = min(numpages - i, nr);
	359	if (enable) {
	360	for (j = 0; j < nr; j++) {
57d7f939	361	pte_val(*pte) &= ~_PAGE_INVALID;
cfb0b241 HC	362	address += PAGE_SIZE;
	363	pte++;
	364	}
	365	} else {
	366	ipte_range(pte, address, nr);
0a4ccc99	367	}
cfb0b241	368	i += nr;
0a4ccc99 HC	369	}
	370	}
	371
	372	#ifdef CONFIG_HIBERNATION
	373	bool kernel_page_present(struct page *page)
	374	{
	375	unsigned long addr;
	376	int cc;
	377
	378	addr = page_to_phys(page);
	379	asm volatile(
	380	" lra %1,0(%1)\n"
	381	" ipm %0\n"
	382	" srl %0,28"
	383	: "=d" (cc), "+a" (addr) : : "cc");
	384	return cc == 0;
	385	}
	386	#endif /* CONFIG_HIBERNATION */
	387
	388	#endif /* CONFIG_DEBUG_PAGEALLOC */