linux-kernel - Re: [PATCH] x86/speculation: Fix incorrect MDS/TAA mitigation status

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Date:   Fri, 15 Nov 2019 09:40:56 -0500
From:   Waiman Long <longman@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] x86/speculation: Fix incorrect MDS/TAA mitigation status

On 11/14/19 5:09 PM, Borislav Petkov wrote:
> On Thu, Nov 14, 2019 at 04:58:24PM -0500, Waiman Long wrote:
>>> Maybe delay MDS mitigation print till TAA is evaluated.
>> I will see what can be done about that. However, this is not a critical
>> issue and I may not change it if there is no easy solution.
> Swapping the two mitigation selection calls in check_bugs() might
> work...

Not really. If taa_select_mitigation() goes first and with
"tsx_async_abort=off" only, the mds file is correct, but the taa file
will be wrong.

Cheers,
Longman