linux-kernel - Re: [PATCH v4 6/7] x86/cpufeature: Blacklist SPEC

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Date:   Thu, 25 Jan 2018 16:16:14 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, arjan@...ux.intel.com,
        karahmed@...zon.de, x86@...nel.org, linux-kernel@...r.kernel.org,
        tim.c.chen@...ux.intel.com, bp@...en8.de, peterz@...radead.org,
        pbonzini@...hat.com, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, gregkh@...ux-foundation.org,
        dave.hansen@...el.com, ashok.raj@...el.com, mingo@...nel.org
Subject: Re: [PATCH v4 6/7] x86/cpufeature: Blacklist SPEC_CTRL on early
 Spectre v2 microcodes

> Here's what I have now. I'm happy enough with this, so the main thing
> I'm looking for is an ack from Alan for patch #5 of the series, if I've
> got that sufficiently correct now.

You have my ACK for patch 5: Any further changes I'll submit as updates
once it's merged.

I am happy with patch 5 and I think for 64bit we are probably done for
the mainstream. VIA/Centaur data would be nice.

The microcode otoh I don't think makes sense - do you want to be secure
with a slightly higher risk of crashes or insecure ? Once you can point
at a newer ucode for each case then yes I personally at least think it
then makes sense to tell users they want the newer one.

Alan