arm64: hibernate: move page handling function to new trans_pgd.c
Now, that we abstracted the required functions move them to a new home. Later, we will generalize these function in order to be useful outside of hibernation. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: James Morse <james.morse@arm.com> Link: https://lore.kernel.org/r/20210125191923.1060122-4-pasha.tatashin@soleen.com Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pavel Tatashin
Will Deacon
parent
41f67d40a3
commit
072e3d96a7
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@ -1132,6 +1132,10 @@ config CRASH_DUMP
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For more details see Documentation/admin-guide/kdump/kdump.rst
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config TRANS_TABLE
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def_bool y
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depends on HIBERNATION
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config XEN_DOM0
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def_bool y
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depends on XEN
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@ -0,0 +1,21 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2020, Microsoft Corporation.
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* Pavel Tatashin <pasha.tatashin@soleen.com>
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*/
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#ifndef _ASM_TRANS_TABLE_H
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#define _ASM_TRANS_TABLE_H
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#include <linux/bits.h>
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#include <linux/types.h>
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#include <asm/pgtable-types.h>
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int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start,
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unsigned long end);
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int trans_pgd_map_page(pgd_t *trans_pgd, void *page, unsigned long dst_addr,
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pgprot_t pgprot);
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#endif /* _ASM_TRANS_TABLE_H */
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@ -16,7 +16,6 @@
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#define pr_fmt(x) "hibernate: " x
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#include <linux/cpu.h>
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#include <linux/kvm_host.h>
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#include <linux/mm.h>
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#include <linux/pm.h>
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#include <linux/sched.h>
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#include <linux/suspend.h>
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@ -31,13 +30,12 @@
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#include <asm/memory.h>
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#include <asm/mmu_context.h>
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#include <asm/mte.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/sections.h>
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#include <asm/smp.h>
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#include <asm/smp_plat.h>
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#include <asm/suspend.h>
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#include <asm/sysreg.h>
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#include <asm/trans_pgd.h>
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#include <asm/virt.h>
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/*
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@ -178,54 +176,6 @@ int arch_hibernation_header_restore(void *addr)
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}
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EXPORT_SYMBOL(arch_hibernation_header_restore);
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static int trans_pgd_map_page(pgd_t *trans_pgd, void *page,
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unsigned long dst_addr,
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pgprot_t pgprot)
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{
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pgd_t *pgdp;
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p4d_t *p4dp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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pgdp = pgd_offset_pgd(trans_pgd, dst_addr);
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if (pgd_none(READ_ONCE(*pgdp))) {
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p4dp = (void *)get_safe_page(GFP_ATOMIC);
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if (!pgdp)
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return -ENOMEM;
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pgd_populate(&init_mm, pgdp, p4dp);
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}
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p4dp = p4d_offset(pgdp, dst_addr);
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if (p4d_none(READ_ONCE(*p4dp))) {
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pudp = (void *)get_safe_page(GFP_ATOMIC);
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if (!pudp)
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return -ENOMEM;
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p4d_populate(&init_mm, p4dp, pudp);
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}
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pudp = pud_offset(p4dp, dst_addr);
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if (pud_none(READ_ONCE(*pudp))) {
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pmdp = (void *)get_safe_page(GFP_ATOMIC);
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if (!pmdp)
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return -ENOMEM;
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pud_populate(&init_mm, pudp, pmdp);
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}
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pmdp = pmd_offset(pudp, dst_addr);
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if (pmd_none(READ_ONCE(*pmdp))) {
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ptep = (void *)get_safe_page(GFP_ATOMIC);
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if (!ptep)
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return -ENOMEM;
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pmd_populate_kernel(&init_mm, pmdp, ptep);
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}
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ptep = pte_offset_kernel(pmdp, dst_addr);
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set_pte(ptep, pfn_pte(virt_to_pfn(page), PAGE_KERNEL_EXEC));
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return 0;
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}
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/*
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* Copies length bytes, starting at src_start into an new page,
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* perform cache maintenance, then maps it at the specified address low
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@ -462,182 +412,6 @@ int swsusp_arch_suspend(void)
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return ret;
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}
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static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
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{
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pte_t pte = READ_ONCE(*src_ptep);
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if (pte_valid(pte)) {
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/*
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* Resume will overwrite areas that may be marked
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* read only (code, rodata). Clear the RDONLY bit from
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* the temporary mappings we use during restore.
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*/
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set_pte(dst_ptep, pte_mkwrite(pte));
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} else if (debug_pagealloc_enabled() && !pte_none(pte)) {
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/*
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* debug_pagealloc will removed the PTE_VALID bit if
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* the page isn't in use by the resume kernel. It may have
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* been in use by the original kernel, in which case we need
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* to put it back in our copy to do the restore.
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*
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* Before marking this entry valid, check the pfn should
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* be mapped.
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*/
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BUG_ON(!pfn_valid(pte_pfn(pte)));
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set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
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}
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}
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static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
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unsigned long end)
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{
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pte_t *src_ptep;
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pte_t *dst_ptep;
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unsigned long addr = start;
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dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_ptep)
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return -ENOMEM;
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pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
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dst_ptep = pte_offset_kernel(dst_pmdp, start);
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src_ptep = pte_offset_kernel(src_pmdp, start);
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do {
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_copy_pte(dst_ptep, src_ptep, addr);
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} while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
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return 0;
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}
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static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
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unsigned long end)
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{
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pmd_t *src_pmdp;
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pmd_t *dst_pmdp;
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unsigned long next;
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unsigned long addr = start;
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if (pud_none(READ_ONCE(*dst_pudp))) {
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dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_pmdp)
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return -ENOMEM;
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pud_populate(&init_mm, dst_pudp, dst_pmdp);
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}
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dst_pmdp = pmd_offset(dst_pudp, start);
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src_pmdp = pmd_offset(src_pudp, start);
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do {
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pmd_t pmd = READ_ONCE(*src_pmdp);
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next = pmd_addr_end(addr, end);
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if (pmd_none(pmd))
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continue;
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if (pmd_table(pmd)) {
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if (copy_pte(dst_pmdp, src_pmdp, addr, next))
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return -ENOMEM;
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} else {
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set_pmd(dst_pmdp,
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__pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
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}
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} while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
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return 0;
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}
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static int copy_pud(p4d_t *dst_p4dp, p4d_t *src_p4dp, unsigned long start,
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unsigned long end)
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{
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pud_t *dst_pudp;
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pud_t *src_pudp;
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unsigned long next;
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unsigned long addr = start;
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if (p4d_none(READ_ONCE(*dst_p4dp))) {
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dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_pudp)
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return -ENOMEM;
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p4d_populate(&init_mm, dst_p4dp, dst_pudp);
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}
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dst_pudp = pud_offset(dst_p4dp, start);
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src_pudp = pud_offset(src_p4dp, start);
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do {
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pud_t pud = READ_ONCE(*src_pudp);
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next = pud_addr_end(addr, end);
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if (pud_none(pud))
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continue;
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if (pud_table(pud)) {
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if (copy_pmd(dst_pudp, src_pudp, addr, next))
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return -ENOMEM;
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} else {
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set_pud(dst_pudp,
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__pud(pud_val(pud) & ~PUD_SECT_RDONLY));
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}
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} while (dst_pudp++, src_pudp++, addr = next, addr != end);
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return 0;
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}
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static int copy_p4d(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
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unsigned long end)
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{
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p4d_t *dst_p4dp;
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p4d_t *src_p4dp;
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unsigned long next;
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unsigned long addr = start;
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dst_p4dp = p4d_offset(dst_pgdp, start);
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src_p4dp = p4d_offset(src_pgdp, start);
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do {
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next = p4d_addr_end(addr, end);
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if (p4d_none(READ_ONCE(*src_p4dp)))
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continue;
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if (copy_pud(dst_p4dp, src_p4dp, addr, next))
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return -ENOMEM;
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} while (dst_p4dp++, src_p4dp++, addr = next, addr != end);
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return 0;
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}
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static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start,
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unsigned long end)
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{
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unsigned long next;
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unsigned long addr = start;
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pgd_t *src_pgdp = pgd_offset_k(start);
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dst_pgdp = pgd_offset_pgd(dst_pgdp, start);
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do {
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next = pgd_addr_end(addr, end);
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if (pgd_none(READ_ONCE(*src_pgdp)))
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continue;
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if (copy_p4d(dst_pgdp, src_pgdp, addr, next))
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return -ENOMEM;
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} while (dst_pgdp++, src_pgdp++, addr = next, addr != end);
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return 0;
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}
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static int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start,
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unsigned long end)
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{
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int rc;
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pgd_t *trans_pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
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if (!trans_pgd) {
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pr_err("Failed to allocate memory for temporary page tables.\n");
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return -ENOMEM;
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}
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rc = copy_page_tables(trans_pgd, start, end);
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if (!rc)
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*dst_pgdp = trans_pgd;
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return rc;
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}
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/*
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* Setup then Resume from the hibernate image using swsusp_arch_suspend_exit().
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*
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@ -6,6 +6,7 @@ obj-y := dma-mapping.o extable.o fault.o init.o \
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obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
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obj-$(CONFIG_PTDUMP_CORE) += ptdump.o
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obj-$(CONFIG_PTDUMP_DEBUGFS) += ptdump_debugfs.o
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obj-$(CONFIG_TRANS_TABLE) += trans_pgd.o
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obj-$(CONFIG_NUMA) += numa.o
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obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o
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obj-$(CONFIG_ARM64_MTE) += mteswap.o
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@ -0,0 +1,250 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Transitional page tables for kexec and hibernate
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*
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* This file derived from: arch/arm64/kernel/hibernate.c
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*
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* Copyright (c) 2020, Microsoft Corporation.
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* Pavel Tatashin <pasha.tatashin@soleen.com>
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*
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*/
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/*
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* Transitional tables are used during system transferring from one world to
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* another: such as during hibernate restore, and kexec reboots. During these
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* phases one cannot rely on page table not being overwritten. This is because
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* hibernate and kexec can overwrite the current page tables during transition.
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*/
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#include <asm/trans_pgd.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <linux/suspend.h>
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#include <linux/bug.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
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{
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pte_t pte = READ_ONCE(*src_ptep);
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if (pte_valid(pte)) {
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/*
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* Resume will overwrite areas that may be marked
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* read only (code, rodata). Clear the RDONLY bit from
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* the temporary mappings we use during restore.
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*/
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set_pte(dst_ptep, pte_mkwrite(pte));
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} else if (debug_pagealloc_enabled() && !pte_none(pte)) {
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/*
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* debug_pagealloc will removed the PTE_VALID bit if
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* the page isn't in use by the resume kernel. It may have
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* been in use by the original kernel, in which case we need
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* to put it back in our copy to do the restore.
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*
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* Before marking this entry valid, check the pfn should
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* be mapped.
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*/
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BUG_ON(!pfn_valid(pte_pfn(pte)));
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set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
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}
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}
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static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
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unsigned long end)
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{
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pte_t *src_ptep;
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pte_t *dst_ptep;
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unsigned long addr = start;
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dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_ptep)
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return -ENOMEM;
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pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
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dst_ptep = pte_offset_kernel(dst_pmdp, start);
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src_ptep = pte_offset_kernel(src_pmdp, start);
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do {
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_copy_pte(dst_ptep, src_ptep, addr);
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} while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
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return 0;
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}
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static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
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unsigned long end)
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{
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pmd_t *src_pmdp;
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pmd_t *dst_pmdp;
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unsigned long next;
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unsigned long addr = start;
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if (pud_none(READ_ONCE(*dst_pudp))) {
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dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_pmdp)
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return -ENOMEM;
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pud_populate(&init_mm, dst_pudp, dst_pmdp);
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}
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dst_pmdp = pmd_offset(dst_pudp, start);
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src_pmdp = pmd_offset(src_pudp, start);
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do {
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pmd_t pmd = READ_ONCE(*src_pmdp);
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next = pmd_addr_end(addr, end);
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if (pmd_none(pmd))
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continue;
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if (pmd_table(pmd)) {
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if (copy_pte(dst_pmdp, src_pmdp, addr, next))
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return -ENOMEM;
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} else {
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set_pmd(dst_pmdp,
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__pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
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}
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} while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
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return 0;
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}
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static int copy_pud(p4d_t *dst_p4dp, p4d_t *src_p4dp, unsigned long start,
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unsigned long end)
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{
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pud_t *dst_pudp;
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pud_t *src_pudp;
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unsigned long next;
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unsigned long addr = start;
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if (p4d_none(READ_ONCE(*dst_p4dp))) {
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dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
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if (!dst_pudp)
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return -ENOMEM;
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p4d_populate(&init_mm, dst_p4dp, dst_pudp);
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}
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dst_pudp = pud_offset(dst_p4dp, start);
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src_pudp = pud_offset(src_p4dp, start);
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do {
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pud_t pud = READ_ONCE(*src_pudp);
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next = pud_addr_end(addr, end);
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if (pud_none(pud))
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continue;
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if (pud_table(pud)) {
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if (copy_pmd(dst_pudp, src_pudp, addr, next))
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return -ENOMEM;
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} else {
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set_pud(dst_pudp,
|
||||
__pud(pud_val(pud) & ~PUD_SECT_RDONLY));
|
||||
}
|
||||
} while (dst_pudp++, src_pudp++, addr = next, addr != end);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int copy_p4d(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
|
||||
unsigned long end)
|
||||
{
|
||||
p4d_t *dst_p4dp;
|
||||
p4d_t *src_p4dp;
|
||||
unsigned long next;
|
||||
unsigned long addr = start;
|
||||
|
||||
dst_p4dp = p4d_offset(dst_pgdp, start);
|
||||
src_p4dp = p4d_offset(src_pgdp, start);
|
||||
do {
|
||||
next = p4d_addr_end(addr, end);
|
||||
if (p4d_none(READ_ONCE(*src_p4dp)))
|
||||
continue;
|
||||
if (copy_pud(dst_p4dp, src_p4dp, addr, next))
|
||||
return -ENOMEM;
|
||||
} while (dst_p4dp++, src_p4dp++, addr = next, addr != end);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start,
|
||||
unsigned long end)
|
||||
{
|
||||
unsigned long next;
|
||||
unsigned long addr = start;
|
||||
pgd_t *src_pgdp = pgd_offset_k(start);
|
||||
|
||||
dst_pgdp = pgd_offset_pgd(dst_pgdp, start);
|
||||
do {
|
||||
next = pgd_addr_end(addr, end);
|
||||
if (pgd_none(READ_ONCE(*src_pgdp)))
|
||||
continue;
|
||||
if (copy_p4d(dst_pgdp, src_pgdp, addr, next))
|
||||
return -ENOMEM;
|
||||
} while (dst_pgdp++, src_pgdp++, addr = next, addr != end);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start,
|
||||
unsigned long end)
|
||||
{
|
||||
int rc;
|
||||
pgd_t *trans_pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
||||
|
||||
if (!trans_pgd) {
|
||||
pr_err("Failed to allocate memory for temporary page tables.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
rc = copy_page_tables(trans_pgd, start, end);
|
||||
if (!rc)
|
||||
*dst_pgdp = trans_pgd;
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int trans_pgd_map_page(pgd_t *trans_pgd, void *page,
|
||||
unsigned long dst_addr,
|
||||
pgprot_t pgprot)
|
||||
{
|
||||
pgd_t *pgdp;
|
||||
p4d_t *p4dp;
|
||||
pud_t *pudp;
|
||||
pmd_t *pmdp;
|
||||
pte_t *ptep;
|
||||
|
||||
pgdp = pgd_offset_pgd(trans_pgd, dst_addr);
|
||||
if (pgd_none(READ_ONCE(*pgdp))) {
|
||||
p4dp = (void *)get_safe_page(GFP_ATOMIC);
|
||||
if (!pgdp)
|
||||
return -ENOMEM;
|
||||
pgd_populate(&init_mm, pgdp, p4dp);
|
||||
}
|
||||
|
||||
p4dp = p4d_offset(pgdp, dst_addr);
|
||||
if (p4d_none(READ_ONCE(*p4dp))) {
|
||||
pudp = (void *)get_safe_page(GFP_ATOMIC);
|
||||
if (!pudp)
|
||||
return -ENOMEM;
|
||||
p4d_populate(&init_mm, p4dp, pudp);
|
||||
}
|
||||
|
||||
pudp = pud_offset(p4dp, dst_addr);
|
||||
if (pud_none(READ_ONCE(*pudp))) {
|
||||
pmdp = (void *)get_safe_page(GFP_ATOMIC);
|
||||
if (!pmdp)
|
||||
return -ENOMEM;
|
||||
pud_populate(&init_mm, pudp, pmdp);
|
||||
}
|
||||
|
||||
pmdp = pmd_offset(pudp, dst_addr);
|
||||
if (pmd_none(READ_ONCE(*pmdp))) {
|
||||
ptep = (void *)get_safe_page(GFP_ATOMIC);
|
||||
if (!ptep)
|
||||
return -ENOMEM;
|
||||
pmd_populate_kernel(&init_mm, pmdp, ptep);
|
||||
}
|
||||
|
||||
ptep = pte_offset_kernel(pmdp, dst_addr);
|
||||
set_pte(ptep, pfn_pte(virt_to_pfn(page), PAGE_KERNEL_EXEC));
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue