linux-kernel - Re: [PATCH 1/4] x86/cpufeatures: Add Intel feature bits for Speculation Control

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180120202917.wl3ifriy2iyfti4u@pd.tnic>
Date:   Sat, 20 Jan 2018 21:29:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     arjan@...ux.intel.com, tglx@...utronix.de, karahmed@...zon.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        tim.c.chen@...ux.intel.com, peterz@...radead.org,
        pbonzini@...hat.com, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, gregkh@...ux-foundation.org
Subject: Re: [PATCH 1/4] x86/cpufeatures: Add Intel feature bits for
 Speculation Control

On Sat, Jan 20, 2018 at 12:03:30PM +0000, David Woodhouse wrote:
> Add three feature bits exposed by new microcode on Intel CPUs for
> speculation control. We would now be up to five bits in CPUID(7).RDX
> so take them out of the 'scattered' features and make a proper word
> for them instead.

... as that leaf is a pure feature bits leaf.

> 
> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
> ---
>  arch/x86/include/asm/cpufeature.h        |  7 +++++--
>  arch/x86/include/asm/cpufeatures.h       | 12 +++++++++---
>  arch/x86/include/asm/disabled-features.h |  3 ++-
>  arch/x86/include/asm/required-features.h |  3 ++-
>  arch/x86/kernel/cpu/common.c             |  1 +
>  arch/x86/kernel/cpu/scattered.c          |  2 --
>  6 files changed, 19 insertions(+), 9 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.