RISC-V updates for v6.19-rc5

- Fix CONFIG_RELOCATABLE=y boots by building Image files from vmlinux,
   rather than vmlinux.unstripped, now that the .modinfo section is
   included in vmlinux.unstripped.
 
 - Prevent branch predictor poisoning microarchitectural attacks that
   use the syscall index as a vector by using array_index_nospec() to
   clamp the index after the bounds check (as x86 and ARM64 already
   do).
 
 - Fix a crash in test_kprobes when building with Clang.
 
 - Fix a deadlock possible when tracing is enabled for SBI ecalls.
 
 - Fix the definition of the Zk standard RISC-V ISA extension bundle,
   which was missing the Zknh extension.
 
 - A few other miscellaneous non-functional cleanups, removing unused
   macros, fixing an out-of-date path in code comments, resolving a
   compile-time warning for a type mismatch in a pr_crit(), and removing
   an unnecessary header file inclusion.
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Merge tag 'riscv-for-linus-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Paul Walmsley:
 "Notable changes include a fix to close one common microarchitectural
  attack vector for out-of-order cores. Another patch exposed an
  omission in my boot test coverage, which is currently missing
  relocatable kernels. Otherwise, the fixes seem to be settling down for
  us.

   - Fix CONFIG_RELOCATABLE=y boots by building Image files from
     vmlinux, rather than vmlinux.unstripped, now that the .modinfo
     section is included in vmlinux.unstripped

   - Prevent branch predictor poisoning microarchitectural attacks that
     use the syscall index as a vector by using array_index_nospec() to
     clamp the index after the bounds check (as x86 and ARM64 already
     do)

   - Fix a crash in test_kprobes when building with Clang

   - Fix a deadlock possible when tracing is enabled for SBI ecalls

   - Fix the definition of the Zk standard RISC-V ISA extension bundle,
     which was missing the Zknh extension

   - A few other miscellaneous non-functional cleanups, removing unused
     macros, fixing an out-of-date path in code comments, resolving a
     compile-time warning for a type mismatch in a pr_crit(), and
     removing an unnecessary header file inclusion"

* tag 'riscv-for-linus-6.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: trace: fix snapshot deadlock with sbi ecall
  riscv: remove irqflags.h inclusion in asm/bitops.h
  riscv: cpu_ops_sbi: smp_processor_id() returns int, not unsigned int
  riscv: configs: Clean up references to non-existing configs
  riscv: kexec_image: Fix dead link to boot-image-header.rst
  riscv: pgtable: Cleanup useless VA_USER_XXX definitions
  riscv: cpufeature: Fix Zk bundled extension missing Zknh
  riscv: fix KUnit test_kprobes crash when building with Clang
  riscv: Sanitize syscall table indexing under speculation
  riscv: boot: Always make Image from vmlinux, not vmlinux.unstripped

arch/riscv/boot/Makefile

@@ -31,11 +31,7 @@ $(obj)/xipImage: vmlinux FORCE
 
 endif
 
-ifdef CONFIG_RELOCATABLE
-$(obj)/Image: vmlinux.unstripped FORCE
-else
 $(obj)/Image: vmlinux FORCE
-endif
 	$(call if_changed,objcopy)
 
 $(obj)/Image.gz: $(obj)/Image FORCE

arch/riscv/configs/nommu_k210_defconfig

@@ -55,7 +55,6 @@ CONFIG_DEVTMPFS_MOUNT=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_DEVMEM is not set
 CONFIG_I2C=y
-# CONFIG_I2C_COMPAT is not set
 CONFIG_I2C_CHARDEV=y
 # CONFIG_I2C_HELPER_AUTO is not set
 CONFIG_I2C_DESIGNWARE_CORE=y
@@ -89,7 +88,6 @@ CONFIG_PRINTK_TIME=y
 # CONFIG_FRAME_POINTER is not set
 # CONFIG_DEBUG_MISC is not set
 CONFIG_PANIC_ON_OOPS=y
-# CONFIG_SCHED_DEBUG is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_FTRACE is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set

arch/riscv/configs/nommu_k210_sdcard_defconfig

@@ -86,7 +86,6 @@ CONFIG_PRINTK_TIME=y
 # CONFIG_FRAME_POINTER is not set
 # CONFIG_DEBUG_MISC is not set
 CONFIG_PANIC_ON_OOPS=y
-# CONFIG_SCHED_DEBUG is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_FTRACE is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set

arch/riscv/configs/nommu_virt_defconfig

@@ -66,7 +66,6 @@ CONFIG_EXT2_FS=y
 # CONFIG_MISC_FILESYSTEMS is not set
 CONFIG_LSM="[]"
 CONFIG_PRINTK_TIME=y
-# CONFIG_SCHED_DEBUG is not set
 # CONFIG_RCU_TRACE is not set
 # CONFIG_FTRACE is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set

arch/riscv/include/asm/bitops.h

@@ -11,7 +11,6 @@
 #endif /* _LINUX_BITOPS_H */
 
 #include <linux/compiler.h>
-#include <linux/irqflags.h>
 #include <asm/barrier.h>
 #include <asm/bitsperlong.h>
 

arch/riscv/include/asm/pgtable.h

@@ -124,10 +124,6 @@
 #ifdef CONFIG_64BIT
 #include <asm/pgtable-64.h>
 
-#define VA_USER_SV39 (UL(1) << (VA_BITS_SV39 - 1))
-#define VA_USER_SV48 (UL(1) << (VA_BITS_SV48 - 1))
-#define VA_USER_SV57 (UL(1) << (VA_BITS_SV57 - 1))
-
 #define MMAP_VA_BITS_64 ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS)
 #define MMAP_MIN_VA_BITS_64 (VA_BITS_SV39)
 #define MMAP_VA_BITS (is_compat_task() ? VA_BITS_SV32 : MMAP_VA_BITS_64)

arch/riscv/kernel/Makefile

@@ -3,12 +3,6 @@
 # Makefile for the RISC-V Linux kernel
 #
 
-ifdef CONFIG_FTRACE
-CFLAGS_REMOVE_ftrace.o	= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_patch.o	= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_sbi.o	= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_return_address.o	= $(CC_FLAGS_FTRACE)
-endif
 CFLAGS_syscall_table.o	+= $(call cc-disable-warning, override-init)
 CFLAGS_compat_syscall_table.o += $(call cc-disable-warning, override-init)
 
@@ -24,7 +18,6 @@ CFLAGS_sbi_ecall.o := -mcmodel=medany
 ifdef CONFIG_FTRACE
 CFLAGS_REMOVE_alternative.o = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_cpufeature.o = $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_sbi_ecall.o = $(CC_FLAGS_FTRACE)
 endif
 ifdef CONFIG_RELOCATABLE
 CFLAGS_alternative.o += -fno-pie
@@ -43,6 +36,14 @@ CFLAGS_sbi_ecall.o += -D__NO_FORTIFY
 endif
 endif
 
+ifdef CONFIG_FTRACE
+CFLAGS_REMOVE_ftrace.o	= $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_patch.o	= $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_sbi.o	= $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_return_address.o	= $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_sbi_ecall.o = $(CC_FLAGS_FTRACE)
+endif
+
 always-$(KBUILD_BUILTIN) += vmlinux.lds
 
 obj-y	+= head.o

arch/riscv/kernel/cpu_ops_sbi.c

@@ -85,7 +85,7 @@ static void sbi_cpu_stop(void)
 	int ret;
 
 	ret = sbi_hsm_hart_stop();
-	pr_crit("Unable to stop the cpu %u (%d)\n", smp_processor_id(), ret);
+	pr_crit("Unable to stop the cpu %d (%d)\n", smp_processor_id(), ret);
 }
 
 static int sbi_cpu_is_stopped(unsigned int cpuid)

arch/riscv/kernel/cpufeature.c

@@ -301,23 +301,22 @@ static const unsigned int riscv_a_exts[] = {
 	RISCV_ISA_EXT_ZALRSC,
 };
 
+#define RISCV_ISA_EXT_ZKN	\
+	RISCV_ISA_EXT_ZBKB,	\
+	RISCV_ISA_EXT_ZBKC,	\
+	RISCV_ISA_EXT_ZBKX,	\
+	RISCV_ISA_EXT_ZKND,	\
+	RISCV_ISA_EXT_ZKNE,	\
+	RISCV_ISA_EXT_ZKNH
+
 static const unsigned int riscv_zk_bundled_exts[] = {
-	RISCV_ISA_EXT_ZBKB,
-	RISCV_ISA_EXT_ZBKC,
-	RISCV_ISA_EXT_ZBKX,
-	RISCV_ISA_EXT_ZKND,
-	RISCV_ISA_EXT_ZKNE,
+	RISCV_ISA_EXT_ZKN,
 	RISCV_ISA_EXT_ZKR,
-	RISCV_ISA_EXT_ZKT,
+	RISCV_ISA_EXT_ZKT
 };
 
 static const unsigned int riscv_zkn_bundled_exts[] = {
-	RISCV_ISA_EXT_ZBKB,
-	RISCV_ISA_EXT_ZBKC,
-	RISCV_ISA_EXT_ZBKX,
-	RISCV_ISA_EXT_ZKND,
-	RISCV_ISA_EXT_ZKNE,
-	RISCV_ISA_EXT_ZKNH,
+	RISCV_ISA_EXT_ZKN
 };
 
 static const unsigned int riscv_zks_bundled_exts[] = {

arch/riscv/kernel/kexec_image.c

@@ -22,7 +22,7 @@ static int image_probe(const char *kernel_buf, unsigned long kernel_len)
 	if (!h || kernel_len < sizeof(*h))
 		return -EINVAL;
 
-	/* According to Documentation/riscv/boot-image-header.rst,
+	/* According to Documentation/arch/riscv/boot-image-header.rst,
 	 * use "magic2" field to check when version >= 0.2.
 	 */
 

arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S

@@ -181,6 +181,7 @@ SYM_FUNC_END(test_kprobes_c_bnez)
 
 #endif /* CONFIG_RISCV_ISA_C */
 
+.section .rodata
 SYM_DATA_START(test_kprobes_addresses)
 	RISCV_PTR test_kprobes_add_addr1
 	RISCV_PTR test_kprobes_add_addr2
@@ -212,6 +213,7 @@ SYM_DATA_START(test_kprobes_addresses)
 	RISCV_PTR 0
 SYM_DATA_END(test_kprobes_addresses)
 
+.section .rodata
 SYM_DATA_START(test_kprobes_functions)
 	RISCV_PTR test_kprobes_add
 	RISCV_PTR test_kprobes_jal

arch/riscv/kernel/traps.c

@@ -339,8 +339,10 @@ void do_trap_ecall_u(struct pt_regs *regs)
 
 		add_random_kstack_offset();
 
-		if (syscall >= 0 && syscall < NR_syscalls)
+		if (syscall >= 0 && syscall < NR_syscalls) {
+			syscall = array_index_nospec(syscall, NR_syscalls);
 			syscall_handler(regs, syscall);
+		}
 
 		/*
 		 * Ultimately, this value will get limited by KSTACK_OFFSET_MAX(),