Subject: [PATCH v2 5/5] arm64: Enable and document ARM errata 1319367 and 1319537

From: Marc Zyngier <[email-masked]>
Date: Sat, 19 Oct 2019 10:55:21 +0100

Now that everything is in place, let's get the ball rolling
by allowing the corresponding config option to be selected.
Also add the required information to silicon_errata.rst.

Acked-by: Catalin Marinas <[email-masked]>
Signed-off-by: Marc Zyngier <[email-masked]>
---
 Documentation/arm64/silicon-errata.rst |  4 ++++
 arch/arm64/Kconfig                     | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 17ea3fecddaa..0808be134fce 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -70,8 +70,12 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Cortex-A57      | #834220         | ARM64_ERRATUM_834220        |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Cortex-A57      | #1319537        | ARM64_ERRATUM_1319367       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Cortex-A72      | #853709         | N/A                         |
 +----------------+-----------------+-----------------+-----------------------------+
+| ARM            | Cortex-A72      | #1319367        | ARM64_ERRATUM_1319367       |
++----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Cortex-A73      | #858921         | ARM64_ERRATUM_858921        |
 +----------------+-----------------+-----------------+-----------------------------+
 | ARM            | Cortex-A55      | #1024718        | ARM64_ERRATUM_1024718       |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 950a56b71ff0..b2877ed09307 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -538,6 +538,16 @@ config ARM64_ERRATUM_1286807
 	  invalidated has been observed by other observers. The
 	  workaround repeats the TLBI+DSB operation.
 
+config ARM64_ERRATUM_1319367
+	bool "Cortex-A57/A72: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
+	default y
+	help
+	  This option adds work arounds for ARM Cortex-A57 erratum 1319537
+	  and A72 erratum 1319367
+
+	  Cortex-A57 and A72 cores could end-up with corrupted TLBs by
+	  speculating an AT instruction during a guest context switch.
+
 	  If unsure, say Y.
 
 config ARM64_ERRATUM_1463225
-- 
2.20.1

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