linux-kernel - [PATCH 4.4 062/266] powerpc/fsl: Update Spectre v2 reporting

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Message-Id: <20190515090724.537118336@linuxfoundation.org>
Date:   Wed, 15 May 2019 12:52:49 +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, Diana Craciun <diana.craciun@....com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.4 062/266] powerpc/fsl: Update Spectre v2 reporting

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

commit dfa88658fb0583abb92e062c7a9cd5a5b94f2a46 upstream.

Report branch predictor state flush as a mitigation for
Spectre variant 2.

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/security.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -213,8 +213,11 @@ ssize_t cpu_show_spectre_v2(struct devic
 
 		if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW)
 			seq_buf_printf(&s, "(hardware accelerated)");
-	} else
+	} else if (btb_flush_enabled) {
+		seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
+	} else {
 		seq_buf_printf(&s, "Vulnerable");
+	}
 
 	seq_buf_printf(&s, "\n");