Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry@arm.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.1 088/141] arm64: assembler: Switch ESB-instruction with a vanilla nop if !ARM64_HAS_RAS
Date:   Fri, 19 Jul 2019 00:01:53 -0400
Message-Id: <20190719040246.15945-88-sashal@kernel.org>
In-Reply-To: <20190719040246.15945-1-sashal@kernel.org>
References: <20190719040246.15945-1-sashal@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: James Morse <james.morse@arm.com>

[ Upstream commit 2b68a2a963a157f024c67c0697b16f5f792c8a35 ]

The ESB-instruction is a nop on CPUs that don't implement the RAS
extensions. This lets us use it in places like the vectors without
having to use alternatives.

If someone disables CONFIG_ARM64_RAS_EXTN, this instruction still has
its RAS extensions behaviour, but we no longer read DISR_EL1 as this
register does depend on alternatives.

This could go wrong if we want to synchronize an SError from a KVM
guest. On a CPU that has the RAS extensions, but the KConfig option
was disabled, we consume the pending SError with no chance of ever
reading it.

Hide the ESB-instruction behind the CONFIG_ARM64_RAS_EXTN option,
outputting a regular nop if the feature has been disabled.

Reported-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/include/asm/assembler.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index c5308d01e228..9155ce473fa7 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -107,7 +107,11 @@
  * RAS Error Synchronization barrier
  */
 	.macro  esb
+#ifdef CONFIG_ARM64_RAS_EXTN
 	hint    #16
+#else
+	nop
+#endif
 	.endm
 
 /*
-- 
2.20.1