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Date:   Thu, 3 Jan 2019 20:30:06 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@i2se.com>
To:     Jeremy Linton <jeremy.linton@arm.com>,
        Dave Martin <Dave.Martin@arm.com>
Cc:     mark.rutland@arm.com, julien.thierry@arm.com, mlangsdo@redhat.com,
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        suzuki.poulose@arm.com, marc.zyngier@arm.com,
        catalin.marinas@arm.com,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        will.deacon@arm.com, linux-kernel@vger.kernel.org,
        steven.price@arm.com, shankerd@codeaurora.org,
        Dave Hansen <dave.hansen@intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@alien8.de>,
        David Woodhouse <dwmw@amazon.co.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        ykaukab@suse.de, Thomas Gleixner <tglx@linutronix.de>,
        linux-arm-kernel@lists.infradead.org
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In-Reply-To: <db5968e6-609b-1a1f-464d-436327dd1738@arm.com>
References: <20190103004921.1928921-1-jeremy.linton@arm.com>
 <20190103004921.1928921-2-jeremy.linton@arm.com>
 <20190103163740.GC3529@e103592.cambridge.arm.com>
 <db5968e6-609b-1a1f-464d-436327dd1738@arm.com>
Subject: Re: [PATCH v2 1/7] sysfs/cpu: Add "Unknown" vulnerability state
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Hi Jeremy,

> Jeremy Linton <jeremy.linton@arm.com> hat am 3. Januar 2019 um 17:46 geschrieben:
> 
> 
> Hi,
> 
> On 01/03/2019 10:37 AM, Dave Martin wrote:
> > On Wed, Jan 02, 2019 at 06:49:15PM -0600, Jeremy Linton wrote:
> >> 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.
> >>

i applied your patch series on linux-next-20190103. On my Raspberry Pi 3B+ (defconfig) i'm getting this from sysfs:

l1tf:Not affected
meltdown:Not affected
spec_store_bypass:Unknown
spectre_v1:Mitigation: __user pointer sanitization
spectre_v2:Unknown

AFAIK it has 4 Cortex-A53 cores (no PSCI firmware), so shouldn't be affected.

How can this be fixed?

Thanks
Stefan