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Subject[PATCH v9 02/18] arm64: hibernate: move page handling function to new trans_pgd.c
Date
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>
---
arch/arm64/Kconfig | 4 +
arch/arm64/include/asm/trans_pgd.h | 21 +++
arch/arm64/kernel/hibernate.c | 199 +-------------------------
arch/arm64/mm/Makefile | 1 +
arch/arm64/mm/trans_pgd.c | 219 +++++++++++++++++++++++++++++
5 files changed, 246 insertions(+), 198 deletions(-)
create mode 100644 arch/arm64/include/asm/trans_pgd.h
create mode 100644 arch/arm64/mm/trans_pgd.c

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0b30e884e088..63e0e1db6b2e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1107,6 +1107,10 @@ config CRASH_DUMP

For more details see Documentation/admin-guide/kdump/kdump.rst

+config TRANS_TABLE
+ def_bool y
+ depends on HIBERNATION
+
config XEN_DOM0
def_bool y
depends on XEN
diff --git a/arch/arm64/include/asm/trans_pgd.h b/arch/arm64/include/asm/trans_pgd.h
new file mode 100644
index 000000000000..23153c13d1ce
--- /dev/null
+++ b/arch/arm64/include/asm/trans_pgd.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Copyright (c) 2020, Microsoft Corporation.
+ * Pavel Tatashin <pasha.tatashin@soleen.com>
+ */
+
+#ifndef _ASM_TRANS_TABLE_H
+#define _ASM_TRANS_TABLE_H
+
+#include <linux/bits.h>
+#include <linux/types.h>
+#include <asm/pgtable-types.h>
+
+int trans_pgd_create_copy(pgd_t **dst_pgdp, unsigned long start,
+ unsigned long end);
+
+int trans_pgd_map_page(pgd_t *trans_pgd, void *page, unsigned long dst_addr,
+ pgprot_t pgprot);
+
+#endif /* _ASM_TRANS_TABLE_H */
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 590963c9c609..3d6f0fd73591 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -16,7 +16,6 @@
#define pr_fmt(x) "hibernate: " x
#include <linux/cpu.h>
#include <linux/kvm_host.h>
-#include <linux/mm.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/suspend.h>
@@ -31,14 +30,12 @@
#include <asm/kexec.h>
#include <asm/memory.h>
#include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/pgtable-hwdef.h>
#include <asm/sections.h>
#include <asm/smp.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>
#include <asm/sysreg.h>
+#include <asm/trans_pgd.h>
#include <asm/virt.h>

/*
@@ -182,45 +179,6 @@ int arch_hibernation_header_restore(void *addr)
}
EXPORT_SYMBOL(arch_hibernation_header_restore);

-static int trans_pgd_map_page(pgd_t *trans_pgd, void *page,
- unsigned long dst_addr,
- pgprot_t pgprot)
-{
- pgd_t *pgdp;
- pud_t *pudp;
- pmd_t *pmdp;
- pte_t *ptep;
-
- pgdp = pgd_offset_raw(trans_pgd, dst_addr);
- if (pgd_none(READ_ONCE(*pgdp))) {
- pudp = (void *)get_safe_page(GFP_ATOMIC);
- if (!pudp)
- return -ENOMEM;
- pgd_populate(&init_mm, pgdp, pudp);
- }
-
- pudp = pud_offset(pgdp, 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;
-}
-
/*
* Copies length bytes, starting at src_start into an new page,
* perform cache maintenance, then maps it at the specified address low
@@ -339,161 +297,6 @@ int swsusp_arch_suspend(void)
return ret;
}

-static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
-{
- pte_t pte = READ_ONCE(*src_ptep);
-
- if (pte_valid(pte)) {
- /*
- * Resume will overwrite areas that may be marked
- * read only (code, rodata). Clear the RDONLY bit from
- * the temporary mappings we use during restore.
- */
- set_pte(dst_ptep, pte_mkwrite(pte));
- } else if (debug_pagealloc_enabled() && !pte_none(pte)) {
- /*
- * debug_pagealloc will removed the PTE_VALID bit if
- * the page isn't in use by the resume kernel. It may have
- * been in use by the original kernel, in which case we need
- * to put it back in our copy to do the restore.
- *
- * Before marking this entry valid, check the pfn should
- * be mapped.
- */
- BUG_ON(!pfn_valid(pte_pfn(pte)));
-
- set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
- }
-}
-
-static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
- unsigned long end)
-{
- pte_t *src_ptep;
- pte_t *dst_ptep;
- unsigned long addr = start;
-
- dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_ptep)
- return -ENOMEM;
- pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
- dst_ptep = pte_offset_kernel(dst_pmdp, start);
-
- src_ptep = pte_offset_kernel(src_pmdp, start);
- do {
- _copy_pte(dst_ptep, src_ptep, addr);
- } while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
-
- return 0;
-}
-
-static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
- unsigned long end)
-{
- pmd_t *src_pmdp;
- pmd_t *dst_pmdp;
- unsigned long next;
- unsigned long addr = start;
-
- if (pud_none(READ_ONCE(*dst_pudp))) {
- dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_pmdp)
- return -ENOMEM;
- pud_populate(&init_mm, dst_pudp, dst_pmdp);
- }
- dst_pmdp = pmd_offset(dst_pudp, start);
-
- src_pmdp = pmd_offset(src_pudp, start);
- do {
- pmd_t pmd = READ_ONCE(*src_pmdp);
-
- next = pmd_addr_end(addr, end);
- if (pmd_none(pmd))
- continue;
- if (pmd_table(pmd)) {
- if (copy_pte(dst_pmdp, src_pmdp, addr, next))
- return -ENOMEM;
- } else {
- set_pmd(dst_pmdp,
- __pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
- }
- } while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
-
- return 0;
-}
-
-static int copy_pud(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
- unsigned long end)
-{
- pud_t *dst_pudp;
- pud_t *src_pudp;
- unsigned long next;
- unsigned long addr = start;
-
- if (pgd_none(READ_ONCE(*dst_pgdp))) {
- dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
- if (!dst_pudp)
- return -ENOMEM;
- pgd_populate(&init_mm, dst_pgdp, dst_pudp);
- }
- dst_pudp = pud_offset(dst_pgdp, start);
-
- src_pudp = pud_offset(src_pgdp, start);
- do {
- pud_t pud = READ_ONCE(*src_pudp);
-
- next = pud_addr_end(addr, end);
- if (pud_none(pud))
- continue;
- if (pud_table(pud)) {
- if (copy_pmd(dst_pudp, src_pudp, addr, next))
- return -ENOMEM;
- } else {
- 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_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_raw(dst_pgdp, start);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none(READ_ONCE(*src_pgdp)))
- continue;
- if (copy_pud(dst_pgdp, src_pgdp, addr, next))
- return -ENOMEM;
- } while (dst_pgdp++, src_pgdp++, addr = next, addr != end);
-
- return 0;
-}
-
-static 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;
-}
-
/*
* Setup then Resume from the hibernate image using swsusp_arch_suspend_exit().
*
diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
index d91030f0ffee..bdad6ff0d72c 100644
--- a/arch/arm64/mm/Makefile
+++ b/arch/arm64/mm/Makefile
@@ -6,6 +6,7 @@ obj-y := dma-mapping.o extable.o fault.o init.o \
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_PTDUMP_CORE) += dump.o
obj-$(CONFIG_PTDUMP_DEBUGFS) += ptdump_debugfs.o
+obj-$(CONFIG_TRANS_TABLE) += trans_pgd.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o
KASAN_SANITIZE_physaddr.o += n
diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c
new file mode 100644
index 000000000000..d20e48520cef
--- /dev/null
+++ b/arch/arm64/mm/trans_pgd.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Transitional page tables for kexec and hibernate
+ *
+ * This file derived from: arch/arm64/kernel/hibernate.c
+ *
+ * Copyright (c) 2020, Microsoft Corporation.
+ * Pavel Tatashin <pasha.tatashin@soleen.com>
+ *
+ */
+
+/*
+ * Transitional tables are used during system transferring from one world to
+ * another: such as during hibernate restore, and kexec reboots. During these
+ * phases one cannot rely on page table not being overwritten. This is because
+ * hibernate and kexec can overwrite the current page tables during transition.
+ */
+
+#include <asm/trans_pgd.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <linux/suspend.h>
+#include <linux/bug.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+
+static void _copy_pte(pte_t *dst_ptep, pte_t *src_ptep, unsigned long addr)
+{
+ pte_t pte = READ_ONCE(*src_ptep);
+
+ if (pte_valid(pte)) {
+ /*
+ * Resume will overwrite areas that may be marked
+ * read only (code, rodata). Clear the RDONLY bit from
+ * the temporary mappings we use during restore.
+ */
+ set_pte(dst_ptep, pte_mkwrite(pte));
+ } else if (debug_pagealloc_enabled() && !pte_none(pte)) {
+ /*
+ * debug_pagealloc will removed the PTE_VALID bit if
+ * the page isn't in use by the resume kernel. It may have
+ * been in use by the original kernel, in which case we need
+ * to put it back in our copy to do the restore.
+ *
+ * Before marking this entry valid, check the pfn should
+ * be mapped.
+ */
+ BUG_ON(!pfn_valid(pte_pfn(pte)));
+
+ set_pte(dst_ptep, pte_mkpresent(pte_mkwrite(pte)));
+ }
+}
+
+static int copy_pte(pmd_t *dst_pmdp, pmd_t *src_pmdp, unsigned long start,
+ unsigned long end)
+{
+ pte_t *src_ptep;
+ pte_t *dst_ptep;
+ unsigned long addr = start;
+
+ dst_ptep = (pte_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_ptep)
+ return -ENOMEM;
+ pmd_populate_kernel(&init_mm, dst_pmdp, dst_ptep);
+ dst_ptep = pte_offset_kernel(dst_pmdp, start);
+
+ src_ptep = pte_offset_kernel(src_pmdp, start);
+ do {
+ _copy_pte(dst_ptep, src_ptep, addr);
+ } while (dst_ptep++, src_ptep++, addr += PAGE_SIZE, addr != end);
+
+ return 0;
+}
+
+static int copy_pmd(pud_t *dst_pudp, pud_t *src_pudp, unsigned long start,
+ unsigned long end)
+{
+ pmd_t *src_pmdp;
+ pmd_t *dst_pmdp;
+ unsigned long next;
+ unsigned long addr = start;
+
+ if (pud_none(READ_ONCE(*dst_pudp))) {
+ dst_pmdp = (pmd_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_pmdp)
+ return -ENOMEM;
+ pud_populate(&init_mm, dst_pudp, dst_pmdp);
+ }
+ dst_pmdp = pmd_offset(dst_pudp, start);
+
+ src_pmdp = pmd_offset(src_pudp, start);
+ do {
+ pmd_t pmd = READ_ONCE(*src_pmdp);
+
+ next = pmd_addr_end(addr, end);
+ if (pmd_none(pmd))
+ continue;
+ if (pmd_table(pmd)) {
+ if (copy_pte(dst_pmdp, src_pmdp, addr, next))
+ return -ENOMEM;
+ } else {
+ set_pmd(dst_pmdp,
+ __pmd(pmd_val(pmd) & ~PMD_SECT_RDONLY));
+ }
+ } while (dst_pmdp++, src_pmdp++, addr = next, addr != end);
+
+ return 0;
+}
+
+static int copy_pud(pgd_t *dst_pgdp, pgd_t *src_pgdp, unsigned long start,
+ unsigned long end)
+{
+ pud_t *dst_pudp;
+ pud_t *src_pudp;
+ unsigned long next;
+ unsigned long addr = start;
+
+ if (pgd_none(READ_ONCE(*dst_pgdp))) {
+ dst_pudp = (pud_t *)get_safe_page(GFP_ATOMIC);
+ if (!dst_pudp)
+ return -ENOMEM;
+ pgd_populate(&init_mm, dst_pgdp, dst_pudp);
+ }
+ dst_pudp = pud_offset(dst_pgdp, start);
+
+ src_pudp = pud_offset(src_pgdp, start);
+ do {
+ pud_t pud = READ_ONCE(*src_pudp);
+
+ next = pud_addr_end(addr, end);
+ if (pud_none(pud))
+ continue;
+ if (pud_table(pud)) {
+ if (copy_pmd(dst_pudp, src_pudp, addr, next))
+ return -ENOMEM;
+ } else {
+ 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_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_raw(dst_pgdp, start);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none(READ_ONCE(*src_pgdp)))
+ continue;
+ if (copy_pud(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;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+
+ pgdp = pgd_offset_raw(trans_pgd, dst_addr);
+ if (pgd_none(READ_ONCE(*pgdp))) {
+ pudp = (void *)get_safe_page(GFP_ATOMIC);
+ if (!pudp)
+ return -ENOMEM;
+ pgd_populate(&init_mm, pgdp, pudp);
+ }
+
+ pudp = pud_offset(pgdp, 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;
+}
--
2.17.1
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