From: "Russell King (Oracle)" <rmk+kernel@xxxxxxxxxxxxxxx>
Add a struct definition for the level zero page table group (the
optional trampoline page tables, reserved page tables, and swapper page
tables).
Add a symbol and extern declaration for the node 0 page table group.
Add an array of pointers to per-node page tables, which will default to
using the node 0 page table group.
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/pgtable.h | 14 ++++++++++++++
arch/arm64/kernel/vmlinux.lds.S | 3 +++
arch/arm64/mm/ktext.c | 4 ++++
3 files changed, 21 insertions(+)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 97d2127d64eb..0eb71b2b1bd2 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -623,6 +623,20 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
extern pgd_t tramp_pg_dir[PTRS_PER_PGD];
extern pgd_t reserved_pg_dir[PTRS_PER_PGD];
+struct pgtables {
+#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
+ pgd_t tramp_pg_dir[PTRS_PER_PGD];
+#endif
+ pgd_t reserved_pg_dir[PTRS_PER_PGD];
+ pgd_t swapper_pg_dir[PTRS_PER_PGD];
+};
+
+extern struct pgtables pgtable_node0;
+
+#ifdef CONFIG_REPLICATE_KTEXT
+extern struct pgtables *pgtables[MAX_NUMNODES];
+#endif
+
extern void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd);
static inline bool in_swapper_pgdir(void *addr)
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 3cd7e76cc562..d3c7ed76adbf 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -212,6 +212,9 @@ SECTIONS
idmap_pg_dir = .;
. += PAGE_SIZE;
+ /* pgtable struct - covers the tramp, reserved and swapper pgdirs */
+ pgtable_node0 = .;
+
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
tramp_pg_dir = .;
. += PAGE_SIZE;
diff --git a/arch/arm64/mm/ktext.c b/arch/arm64/mm/ktext.c
index 04b5ceddae4e..48d7943d6907 100644
--- a/arch/arm64/mm/ktext.c
+++ b/arch/arm64/mm/ktext.c
@@ -15,6 +15,10 @@
#include <asm/ktext.h>
#include <asm/memory.h>
+struct pgtables *pgtables[MAX_NUMNODES] = {
+ [0 ... MAX_NUMNODES - 1] = &pgtable_node0,
+};
+
static void *kernel_texts[MAX_NUMNODES];
void __kprobes ktext_replication_patch(u32 *tp, __le32 insn)
--
2.20.1
