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From:   Jeremy Linton <jeremy.linton@arm.com>
To:     linux-arm-kernel@lists.infradead.org
Cc:     catalin.marinas@arm.com, will.deacon@arm.com, marc.zyngier@arm.com,
        suzuki.poulose@arm.com, dave.martin@arm.com,
        shankerd@codeaurora.org, mark.rutland@arm.com,
        linux-kernel@vger.kernel.org, ykaukab@suse.de,
        julien.thierry@arm.com, mlangsdo@redhat.com, steven.price@arm.com,
        Jeremy Linton <jeremy.linton@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Borislav Petkov <bp@alien8.de>,
        David Woodhouse <dwmw@amazon.co.uk>
Subject: [PATCH v2 1/7] sysfs/cpu: Add "Unknown" vulnerability state
Date:   Wed,  2 Jan 2019 18:49:15 -0600
Message-Id: <20190103004921.1928921-2-jeremy.linton@arm.com>
In-Reply-To: <20190103004921.1928921-1-jeremy.linton@arm.com>
References: <20190103004921.1928921-1-jeremy.linton@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

There is a lot of variation in the Arm ecosystem. Because of this,
there exist possible cases where the kernel cannot authoritatively
determine if a machine is vulnerable.

Rather than guess the vulnerability status in cases where
the mitigation is disabled or the firmware isn't responding
correctly, we need to display an "Unknown" state.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
---
 Documentation/ABI/testing/sysfs-devices-system-cpu | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 9605dbd4b5b5..876103fddfa4 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -495,6 +495,7 @@ Description:	Information about CPU vulnerabilities
 		"Not affected"	  CPU is not affected by the vulnerability
 		"Vulnerable"	  CPU is affected and no mitigation in effect
 		"Mitigation: $M"  CPU is affected and mitigation $M is in effect
+		"Unknown"    	  The kernel is unable to make a determination
 
 		Details about the l1tf file can be found in
 		Documentation/admin-guide/l1tf.rst
-- 
2.17.2