linux-kernel - Re: [PATCH v6 00/10] arm64: add system vulnerability sysfs entries

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Date:   Mon, 25 Mar 2019 12:22:47 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
        marc.zyngier@....com, suzuki.poulose@....com, Dave.Martin@....com,
        shankerd@...eaurora.org, julien.thierry@....com,
        mlangsdo@...hat.com, stefan.wahren@....com, Andre.Przywara@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/10] arm64: add system vulnerability sysfs entries

On Thu, Mar 21, 2019 at 06:05:47PM -0500, Jeremy Linton wrote:
> Arm64 machines should be displaying a human readable
> vulnerability status to speculative execution attacks in
> /sys/devices/system/cpu/vulnerabilities 
> 
> This series enables that behavior by providing the expected
> functions. Those functions expose the cpu errata and feature
> states, as well as whether firmware is responding appropriately
> to display the overall machine status. This means that in a
> heterogeneous machine we will only claim the machine is mitigated
> or safe if we are confident all booted cores are safe or
> mitigated.
> 
> v5->v6:
> 	Invert meltdown logic to display that a core is safe rather
> 	       than mitigated if the mitigation has been enabled on
> 	       machines that are safe. This can happen when the
> 	       mitigation was forced on via command line or KASLR.
> 	       This means that in order to detect if kpti is enabled
> 	       other methods must be used (look at dmesg) when the
> 	       machine isn't itself susceptible to meltdown.
> 	Trivial whitespace tweaks.

The v6 logic looks fine to me. For the whole series:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>