linux-kernel - [PATCH 5.7 085/166] powerpc/64s/exception: Fix 0x1500 interrupt handler crash

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Date:   Tue, 14 Jul 2020 20:44:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paul Menzel <pmenzel@...gen.mpg.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 085/166] powerpc/64s/exception: Fix 0x1500 interrupt handler crash

From: Nicholas Piggin <npiggin@...il.com>

[ Upstream commit 4557ac6b344b8cdf948ff8b007e8e1de34832f2e ]

A typo caused the interrupt handler to branch immediately to the
common "unknown interrupt" handler and skip the special case test for
denormal cause.

This does not affect KVM softpatch handling (e.g., for POWER9 TM
assist) because the KVM test was moved to common code by commit
9600f261acaa ("powerpc/64s/exception: Move KVM test to common code")
just before this bug was introduced.

Fixes: 3f7fbd97d07d ("powerpc/64s/exception: Clean up SRR specifiers")
Reported-by: Paul Menzel <pmenzel@...gen.mpg.de>
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
Tested-by: Paul Menzel <pmenzel@...gen.mpg.de>
[mpe: Split selftest into a separate patch]
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200708074942.1713396-1-npiggin@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/kernel/exceptions-64s.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index d9ddce40bed89..fd99d4feec7a4 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2547,7 +2547,7 @@ EXC_VIRT_NONE(0x5400, 0x100)
 INT_DEFINE_BEGIN(denorm_exception)
 	IVEC=0x1500
 	IHSRR=1
-	IBRANCH_COMMON=0
+	IBRANCH_TO_COMMON=0
 	IKVM_REAL=1
 INT_DEFINE_END(denorm_exception)
 
-- 
2.25.1