Patch "arm64: errata: add workaround for cortex-a53 erratum #845719" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

arm64: errata: add workaround for cortex-a53 erratum #845719

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     arm64-errata-add-workaround-for-cortex-a53-erratum-845719.patch

and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Will Deacon <[email protected]>
Date: Mon, 23 Mar 2015 19:07:02 +0000
Subject: arm64: errata: add workaround for cortex-a53 erratum #845719

From: Will Deacon <[email protected]>

commit 905e8c5dcaa147163672b06fe9dcb5abaacbc711 upstream.

When running a compat (AArch32) userspace on Cortex-A53, a load at EL0 from a virtual address that matches the bottom 32 bits of the virtual address used by a recent load at (AArch64) EL1 might return incorrect data.

This patch works around the issue by writing to the contextidr_el1 register on the exception return path when returning to a 32-bit task. This workaround is patched in at runtime based on the MIDR value of the processor.

---
 arch/arm64/Kconfig                  |   21 +++++++++++++++++++++
 arch/arm64/include/asm/cpufeature.h |    3 ++-
 arch/arm64/kernel/cpu_errata.c      |    8 ++++++++
 arch/arm64/kernel/entry.S           |   20 ++++++++++++++++++++
 4 files changed, 51 insertions(+), 1 deletion(-)

@@ -361,6 +361,27 @@ config ARM64_ERRATUM_832075
 
 	  If unsure, say Y.
 
+config ARM64_ERRATUM_845719
+	bool "Cortex-A53: 845719: a load might read incorrect data"
+	depends on COMPAT
+	default y
+	help
+	  This option adds an alternative code sequence to work around ARM
+	  erratum 845719 on Cortex-A53 parts up to r0p4.
+
+	  When running a compat (AArch32) userspace on an affected Cortex-A53
+	  part, a load at EL0 from a virtual address that matches the bottom 32
+	  bits of the virtual address used by a recent load at (AArch64) EL1
+	  might return incorrect data.
+
+	  The workaround is to write the contextidr_el1 register on exception
+	  return to a 32-bit task.
+	  Please note that this does not necessarily enable the workaround,
+	  as it depends on the alternative framework, which will only patch
+	  the kernel if an affected CPU is detected.
+
+	  If unsure, say Y.
+
 endmenu
 
 

@@ -23,8 +23,9 @@
 
 #define ARM64_WORKAROUND_CLEAN_CACHE		0
 #define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE	1
+#define ARM64_WORKAROUND_845719			2
 
-#define ARM64_NCAPS				2
+#define ARM64_NCAPS				3
 
 #ifndef __ASSEMBLY__
 

@@ -92,6 +92,14 @@ struct arm64_cpu_capabilities arm64_erra
 			   (1 << MIDR_VARIANT_SHIFT) | 2),
 	},
 #endif
+#ifdef CONFIG_ARM64_ERRATUM_845719
+	{
+	/* Cortex-A53 r0p[01234] */
+		.desc = "ARM erratum 845719",
+		.capability = ARM64_WORKAROUND_845719,
+		MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x04),
+	},
+#endif
 	{
 	}
 };

@@ -21,8 +21,10 @@
 #include <linux/init.h>
 #include <linux/linkage.h>
 
+#include <asm/alternative-asm.h>
 #include <asm/assembler.h>
 #include <asm/asm-offsets.h>
+#include <asm/cpufeature.h>
 #include <asm/errno.h>
 #include <asm/esr.h>
 #include <asm/thread_info.h>

@@ -120,6 +122,24 @@
 	ct_user_enter
 	ldr	x23, [sp, #S_SP]		// load return stack pointer
 	msr	sp_el0, x23
+
+#ifdef CONFIG_ARM64_ERRATUM_845719
+	alternative_insn						\
+	"nop",								\
+	"tbz x22, #4, 1f",						\
+	ARM64_WORKAROUND_845719
+#ifdef CONFIG_PID_IN_CONTEXTIDR
+	alternative_insn						\
+	"nop; nop",							\
+	"mrs x29, contextidr_el1; msr contextidr_el1, x29; 1:",		\
+	ARM64_WORKAROUND_845719
+#else
+	alternative_insn						\
+	"nop",								\
+	"msr contextidr_el1, xzr; 1:",					\
+	ARM64_WORKAROUND_845719
+#endif
+#endif
 	.endif
 	msr	elr_el1, x21			// set up the return data
 	msr	spsr_el1, x22

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/arm64-head.s-ensure-visibility-of-page-tables.patch queue-4.0/arm64-adjust-efi-libstub-object-include-logic.patch queue-4.0/arm64-fix-midr-range-for-cortex-a57-erratum-832075.patch queue-4.0/arm64-apply-alternatives-for-smp-kernels.patch queue-4.0/powerpc-jump_label-include-linux-jump_label.h-to-get-have_jump_label-define.patch queue-4.0/arm64-errata-add-workaround-for-cortex-a53-erratum-845719.patch