linux-kernel - Re: [PATCH V7 14/18] memremap_pages: Add memremap.pks_fault

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Message-ID: <2bbd7ce2-8d16-8724-5505-96a4731c3c45@infradead.org>
Date:   Tue, 3 Aug 2021 21:57:31 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     ira.weiny@...el.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-mm@...ck.org
Subject: Re: [PATCH V7 14/18] memremap_pages: Add memremap.pks_fault_mode

On 8/3/21 9:32 PM, ira.weiny@...el.com wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index bdb22006f713..7902fce7f1da 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4081,6 +4081,20 @@
>   	pirq=		[SMP,APIC] Manual mp-table setup
>   			See Documentation/x86/i386/IO-APIC.rst.
>   
> +	memremap.pks_fault_mode=	[X86] Control the behavior of page map
> +			protection violations.  Violations may not be an actual
> +			use of the memory but simply an attempt to map it in an
> +			incompatible way.
> +			(depends on CONFIG_DEVMAP_ACCESS_PROTECTION

Missing closing ')' above.

> +
> +			Format: { relaxed | strict }
> +
> +			relaxed - Print a warning, disable the protection and
> +				  continue execution.
> +			strict - Stop kernel execution via BUG_ON or fault
> +
> +			default: relaxed
> +


-- 
~Randy