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From:   Michal Suchanek <msuchanek@suse.de>
To:     linuxppc-dev@lists.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Peter Zijlstra <peterz@infradead.org>,
        Michal Suchanek <msuchanek@suse.de>,
        Kate Stewart <kstewart@linuxfoundation.org>,
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        =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@kaod.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH RFC 3/8] powerpc/64: Use barrier_nospec in syscall entry
Date:   Tue, 13 Mar 2018 19:33:01 +0100
Message-Id: <7121fe11b8ecbc0dd041819d8d331324df58c0e0.1520965380.git.msuchanek@suse.de>
In-Reply-To: <cover.1520965380.git.msuchanek@suse.de>
References: <cover.1520965380.git.msuchanek@suse.de>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kernel/entry_64.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2cb5109a7ea3..7bfc4cf48af2 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -36,6 +36,7 @@
 #include <asm/context_tracking.h>
 #include <asm/tm.h>
 #include <asm/ppc-opcode.h>
+#include <asm/barrier.h>
 #include <asm/export.h>
 #ifdef CONFIG_PPC_BOOK3S
 #include <asm/exception-64s.h>
@@ -159,6 +160,7 @@ system_call:			/* label this so stack traces look sane */
 	andi.	r11,r10,_TIF_SYSCALL_DOTRACE
 	bne	.Lsyscall_dotrace		/* does not return */
 	cmpldi	0,r0,NR_syscalls
+	barrier_nospec
 	bge-	.Lsyscall_enosys
 
 .Lsyscall:
@@ -319,6 +321,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 	ld	r10,TI_FLAGS(r10)
 
 	cmpldi	r0,NR_syscalls
+	barrier_nospec
 	blt+	.Lsyscall
 
 	/* Return code is already in r3 thanks to do_syscall_trace_enter() */
-- 
2.13.6