linux-kernel - Re: [PATCH 3/3] x86/efi: Use efi_switch_mm() rather than manually twiddling with cr3

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Message-ID: <20170816125715.GB3384@codeblueprint.co.uk>
Date:   Wed, 16 Aug 2017 13:57:15 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        joeyli <jlee@...e.com>, Borislav Petkov <bp@...en8.de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Neri, Ricardo" <ricardo.neri@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Subject: Re: [PATCH 3/3] x86/efi: Use efi_switch_mm() rather than manually
 twiddling with cr3

On Wed, 16 Aug, at 12:03:22PM, Mark Rutland wrote:
> 
> I'd expect we'd abort at a higher level, not taking any sample. i.e.
> we'd have the core overflow handler check in_funny_mm(), and if so, skip
> the sample, as with the skid case.

FYI, this is my preferred solution for x86 too.