linux-kernel - Re: [PATCH v8 -tip 13/26] kernel/entry: Add support for core-wide protection of kernel-mode

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Message-ID: <13fac0b7-37cb-7313-efb6-ebe166121f8f@infradead.org>
Date:   Mon, 19 Oct 2020 20:41:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, torvalds@...ux-foundation.org,
        fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com,
        Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>, vineeth@...byteword.org,
        Chen Yu <yu.c.chen@...el.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Agata Gruza <agata.gruza@...el.com>,
        Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
        graf@...zon.com, konrad.wilk@...cle.com, dfaggioli@...e.com,
        pjt@...gle.com, rostedt@...dmis.org, derkling@...gle.com,
        benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Junaid Shahid <junaids@...gle.com>, jsbarnes@...gle.com,
        chris.hyser@...cle.com, Aubrey Li <aubrey.li@...ux.intel.com>,
        Tim Chen <tim.c.chen@...el.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH v8 -tip 13/26] kernel/entry: Add support for core-wide
 protection of kernel-mode

On 10/19/20 6:43 PM, Joel Fernandes (Google) wrote:
> 
> ---
>   .../admin-guide/kernel-parameters.txt         |   7 +
>   include/linux/entry-common.h                  |   2 +-
>   include/linux/sched.h                         |  12 +
>   kernel/entry/common.c                         |  25 +-
>   kernel/sched/core.c                           | 229 ++++++++++++++++++
>   kernel/sched/sched.h                          |   3 +
>   6 files changed, 275 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 3236427e2215..48567110f709 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4678,6 +4678,13 @@
>   
>   	sbni=		[NET] Granch SBNI12 leased line adapter
>   
> +	sched_core_protect_kernel=

Needs a list of possible values after '=', along with telling us
what the default value/setting is.


> +			[SCHED_CORE] Pause SMT siblings of a core running in
> +			user mode, if at least one of the siblings of the core
> +			is running in kernel mode. This is to guarantee that
> +			kernel data is not leaked to tasks which are not trusted
> +			by the kernel.
> +


thanks.