Commit 311da497 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 

Pull ARM updates from Russell King:

 - Initial round of Spectre variant 1 and variant 2 fixes for 32-bit ARM

 - Clang support improvements

 - nommu updates for v8 MPU

 - enable ARM_MODULE_PLTS by default to avoid problems loading modules
   with larger kernels

 - vmlinux.lds and dma-mapping cleanups

* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (31 commits)
  ARM: spectre-v1: fix syscall entry
  ARM: spectre-v1: add array_index_mask_nospec() implementation
  ARM: spectre-v1: add speculation barrier (csdb) macros
  ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1
  ARM: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling
  ARM: spectre-v2: KVM: invalidate icache on guest exit for Brahma B15
  ARM: KVM: invalidate icache on guest exit for Cortex-A15
  ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17
  ARM: spectre-v2: warn about incorrect context switching functions
  ARM: spectre-v2: add firmware based hardening
  ARM: spectre-v2: harden user aborts in kernel space
  ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit
  ARM: spectre-v2: harden branch predictor on context switches
  ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre
  ARM: bugs: add support for per-processor bug checking
  ARM: bugs: hook processor bug checking into SMP and suspend paths
  ARM: bugs: prepare processor bug infrastructure
  ARM: add more CPU part numbers for Cortex and Brahma B15 CPUs
  ARM: 8774/1: remove no-op macro VMLINUX_SYMBOL()
  ARM: 8773/1: amba: Export amba_bustype
  ...
parents ca95bf62 0ac000e8

arch/arm/Kconfig

+3 −1
Original line number Diff line number Diff line
@@ -1698,6 +1698,7 @@ config ARCH_WANT_GENERAL_HUGETLB 
config ARM_MODULE_PLTS

	bool "Use PLTs to allow module memory to spill over into vmalloc area"

	depends on MODULES

	default y

	help

	  Allocate PLTs when loading modules so that jumps and calls whose

	  targets are too far away for their relative offsets to be encoded
@@ -1708,7 +1709,8 @@ config ARM_MODULE_PLTS 
	  rounding up to page size, the actual memory footprint is usually

	  the same.



	  Say y if you are getting out of memory errors while loading modules

	  Disabling this is usually safe for small single-platform

	  configurations. If unsure, say y.



source "mm/Kconfig"

arch/arm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -106,7 +106,7 @@ tune-$(CONFIG_CPU_V6K) =$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm) 
tune-y := $(tune-y)



ifeq ($(CONFIG_AEABI),y)

CFLAGS_ABI	:=-mabi=aapcs-linux -mno-thumb-interwork -mfpu=vfp

CFLAGS_ABI	:=-mabi=aapcs-linux -mfpu=vfp

else

CFLAGS_ABI	:=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)

endif

arch/arm/boot/compressed/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -113,7 +113,7 @@ CFLAGS_fdt_ro.o := $(nossp_flags) 
CFLAGS_fdt_rw.o := $(nossp_flags)

CFLAGS_fdt_wip.o := $(nossp_flags)



ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)

ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin -I$(obj)

asflags-y := -DZIMAGE



# Supply kernel BSS size to the decompressor via a linker symbol.

arch/arm/include/asm/assembler.h

+8 −0
Original line number Diff line number Diff line
@@ -447,6 +447,14 @@ THUMB( orr \reg , \reg , #PSR_T_BIT ) 
	.size \name , . - \name

	.endm



	.macro	csdb

#ifdef CONFIG_THUMB2_KERNEL

	.inst.w	0xf3af8014

#else

	.inst	0xe320f014

#endif

	.endm



	.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req

#ifndef CONFIG_CPU_USE_DOMAINS

	adds	\tmp, \addr, #\size - 1

arch/arm/include/asm/barrier.h

+32 −0
Original line number Diff line number Diff line
@@ -17,6 +17,12 @@ 
#define isb(option) __asm__ __volatile__ ("isb " #option : : : "memory")

#define dsb(option) __asm__ __volatile__ ("dsb " #option : : : "memory")

#define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")

#ifdef CONFIG_THUMB2_KERNEL

#define CSDB	".inst.w 0xf3af8014"

#else

#define CSDB	".inst	0xe320f014"

#endif

#define csdb() __asm__ __volatile__(CSDB : : : "memory")

#elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6

#define isb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \

				    : : "r" (0) : "memory")
@@ -37,6 +43,13 @@ 
#define dmb(x) __asm__ __volatile__ ("" : : : "memory")

#endif



#ifndef CSDB

#define CSDB

#endif

#ifndef csdb

#define csdb()

#endif



#ifdef CONFIG_ARM_HEAVY_MB

extern void (*soc_mb)(void);

extern void arm_heavy_mb(void);
@@ -63,6 +76,25 @@ extern void arm_heavy_mb(void); 
#define __smp_rmb()	__smp_mb()

#define __smp_wmb()	dmb(ishst)



#ifdef CONFIG_CPU_SPECTRE

static inline unsigned long array_index_mask_nospec(unsigned long idx,

						    unsigned long sz)

{

	unsigned long mask;



	asm volatile(

		"cmp	%1, %2\n"

	"	sbc	%0, %1, %1\n"

	CSDB

	: "=r" (mask)

	: "r" (idx), "Ir" (sz)

	: "cc");



	return mask;

}

#define array_index_mask_nospec array_index_mask_nospec

#endif



#include <asm-generic/barrier.h>



#endif /* !__ASSEMBLY__ */

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