arm64: add alternative runtime patching

With a blatant copy of some x86 bits we introduce the alternative
runtime patching "framework" to arm64.
This is quite basic for now and we only provide the functions we need
at this time.
This is connected to the newly introduced feature bits.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

7 files changed, 139 insertions, 1 deletions

diff --git a/arch/arm64/include/asm/alternative-asm.h b/arch/arm64/include/asm/alternative-asm.h
new file mode 100644
index 000000000000..5ee9340459b8
--- /dev/null
+++ b/arch/arm64/include/asm/alternative-asm.h
@@ -0,0 +1,16 @@
+#ifndef __ASM_ALTERNATIVE_ASM_H
+#define __ASM_ALTERNATIVE_ASM_H
+
+#ifdef __ASSEMBLY__
+
+.macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len
+        .word \orig_offset - .
+        .word \alt_offset - .
+        .hword \feature
+        .byte \orig_len
+        .byte \alt_len
+.endm
+
+#endif  /*  __ASSEMBLY__  */
+
+#endif /* __ASM_ALTERNATIVE_ASM_H */
diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
new file mode 100644
index 000000000000..f6d206e7f9e9
--- /dev/null
+++ b/arch/arm64/include/asm/alternative.h
@@ -0,0 +1,43 @@
+#ifndef __ASM_ALTERNATIVE_H
+#define __ASM_ALTERNATIVE_H
+
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/stringify.h>
+
+struct alt_instr {
+        s32 orig_offset;        /* offset to original instruction */
+        s32 alt_offset;         /* offset to replacement instruction */
+        u16 cpufeature;         /* cpufeature bit set for replacement */
+        u8  orig_len;           /* size of original instruction(s) */
+        u8  alt_len;            /* size of new instruction(s), <= orig_len */
+};
+
+void apply_alternatives(void);
+void free_alternatives_memory(void);
+
+#define ALTINSTR_ENTRY(feature)                                               \
+        " .word 661b - .\n"                             /* label           */ \
+        " .word 663f - .\n"                             /* new instruction */ \
+        " .hword " __stringify(feature) "\n"            /* feature bit     */ \
+        " .byte 662b-661b\n"                            /* source len      */ \
+        " .byte 664f-663f\n"                            /* replacement len */
+
+/* alternative assembly primitive: */
+#define ALTERNATIVE(oldinstr, newinstr, feature)                        \
+        "661:\n\t"                                                      \
+        oldinstr "\n"                                                   \
+        "662:\n"                                                        \
+        ".pushsection .altinstructions,\"a\"\n"                         \
+        ALTINSTR_ENTRY(feature)                                         \
+        ".popsection\n"                                                 \
+        ".pushsection .altinstr_replacement, \"a\"\n"                   \
+        "663:\n\t"                                                      \
+        newinstr "\n"                                                   \
+        "664:\n\t"                                                      \
+        ".popsection\n\t"                                               \
+        ".if ((664b-663b) != (662b-661b))\n\t"                          \
+        "       .error \"Alternatives instruction length mismatch\"\n\t"\
+        ".endif\n"
+
+#endif /* __ASM_ALTERNATIVE_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index b36ebd0aacbb..591a65dc5c9b 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -16,7 +16,7 @@ arm64-obj-y		:= cputable.o debug-monitors.o entry.o irq.o fpsimd.o	\
                            entry-fpsimd.o process.o ptrace.o setup.o signal.o   \
                            sys.o stacktrace.o time.o traps.o io.o vdso.o        \
                            hyp-stub.o psci.o cpu_ops.o insn.o return_address.o  \
-                           cpuinfo.o
+                           cpuinfo.o alternative.o
 
 arm64-obj-$(CONFIG_COMPAT)              += sys32.o kuser32.o signal32.o         \
                                            sys_compat.o                         \
diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c
new file mode 100644
index 000000000000..1a3badab800a
--- /dev/null
+++ b/arch/arm64/kernel/alternative.c
@@ -0,0 +1,64 @@
+/*
+ * alternative runtime patching
+ * inspired by the x86 version
+ *
+ * Copyright (C) 2014 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define pr_fmt(fmt) "alternatives: " fmt
+
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <asm/cacheflush.h>
+#include <asm/alternative.h>
+#include <asm/cpufeature.h>
+#include <linux/stop_machine.h>
+
+extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
+
+static int __apply_alternatives(void *dummy)
+{
+        struct alt_instr *alt;
+        u8 *origptr, *replptr;
+
+        for (alt = __alt_instructions; alt < __alt_instructions_end; alt++) {
+                if (!cpus_have_cap(alt->cpufeature))
+                        continue;
+
+                BUG_ON(alt->alt_len > alt->orig_len);
+
+                pr_info_once("patching kernel code\n");
+
+                origptr = (u8 *)&alt->orig_offset + alt->orig_offset;
+                replptr = (u8 *)&alt->alt_offset + alt->alt_offset;
+                memcpy(origptr, replptr, alt->alt_len);
+                flush_icache_range((uintptr_t)origptr,
+                                   (uintptr_t)(origptr + alt->alt_len));
+        }
+
+        return 0;
+}
+
+void apply_alternatives(void)
+{
+        /* better not try code patching on a live SMP system */
+        stop_machine(__apply_alternatives, NULL, NULL);
+}
+
+void free_alternatives_memory(void)
+{
+        free_reserved_area(__alt_instructions, __alt_instructions_end,
+                           0, "alternatives");
+}
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index b06d1d90ee8c..0ef87896e4ae 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -37,6 +37,7 @@
 #include <linux/of.h>
 #include <linux/irq_work.h>
 
+#include <asm/alternative.h>
 #include <asm/atomic.h>
 #include <asm/cacheflush.h>
 #include <asm/cpu.h>
@@ -309,6 +310,7 @@ void cpu_die(void)
 void __init smp_cpus_done(unsigned int max_cpus)
 {
         pr_info("SMP: Total of %d processors activated.\n", num_online_cpus());
+        apply_alternatives();
 }
 
 void __init smp_prepare_boot_cpu(void)
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 4596f46d0244..3236727be2b9 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -116,6 +116,17 @@ SECTIONS
         . = ALIGN(PAGE_SIZE);
         __init_end = .;
 
+        . = ALIGN(4);
+        .altinstructions : {
+                __alt_instructions = .;
+                *(.altinstructions)
+                __alt_instructions_end = .;
+        }
+        .altinstr_replacement : {
+                *(.altinstr_replacement)
+        }
+
+        . = ALIGN(PAGE_SIZE);
         _data = .;
         _sdata = .;
         RW_DATA_SECTION(64, PAGE_SIZE, THREAD_SIZE)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 494297c698ca..bac492c12fcc 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -39,6 +39,7 @@
 #include <asm/setup.h>
 #include <asm/sizes.h>
 #include <asm/tlb.h>
+#include <asm/alternative.h>
 
 #include "mm.h"
 
@@ -325,6 +326,7 @@ void __init mem_init(void)
 void free_initmem(void)
 {
         free_initmem_default(0);
+        free_alternatives_memory();
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD