linux-kernel - [PATCH 4.4 079/266] powerpc/fsl: Enable runtime patching if nospectre

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Message-Id: <20190515090725.113850383@linuxfoundation.org>
Date:   Wed, 15 May 2019 12:53:06 +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,
        "linuxppc-dev@...abs.org, mpe@...erman.id.au, Diana Craciun" 
        <diana.craciun@....com>, Michael Ellerman <mpe@...erman.id.au>,
        Diana Craciun <diana.craciun@....com>
Subject: [PATCH 4.4 079/266] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used

From: Diana Craciun <diana.craciun@....com>

commit 3bc8ea8603ae4c1e09aca8de229ad38b8091fcb3 upstream.

If the user choses not to use the mitigations, replace
the code sequence with nops.

Signed-off-by: Diana Craciun <diana.craciun@....com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/kernel/setup_32.c |    1 +
 arch/powerpc/kernel/setup_64.c |    1 +
 2 files changed, 2 insertions(+)

--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -323,6 +323,7 @@ void __init setup_arch(char **cmdline_p)
 	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 
 	setup_barrier_nospec();
+	setup_spectre_v2();
 
 	paging_init();
 
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -737,6 +737,7 @@ void __init setup_arch(char **cmdline_p)
 		ppc_md.setup_arch();
 
 	setup_barrier_nospec();
+	setup_spectre_v2();
 
 	paging_init();