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From: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
To: Dave Hansen <dave-gkUM19QKKo4@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 28/34] x86: wire up mprotect_key() system call
Date: Tue, 8 Dec 2015 19:44:59 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.11.1512081943270.3595@nanos> (raw)
In-Reply-To: <20151204011503.2A095839-LXbPSdftPKxrdx17CPfAsdBPR1lH4CV8@public.gmane.org>

On Thu, 3 Dec 2015, Dave Hansen wrote:
>  #include <asm-generic/mman.h>
> diff -puN mm/Kconfig~pkeys-16-x86-mprotect_key mm/Kconfig
> --- a/mm/Kconfig~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.114920208 -0800
> +++ b/mm/Kconfig	2015-12-03 16:21:31.119920435 -0800
> @@ -679,4 +679,5 @@ config NR_PROTECTION_KEYS
>  	# Everything supports a _single_ key, so allow folks to
>  	# at least call APIs that take keys, but require that the
>  	# key be 0.
> +	default 16 if X86_INTEL_MEMORY_PROTECTION_KEYS
>  	default 1

What happens if I set that to 42?

I think we want to make this a runtime evaluated thingy. If pkeys are
compiled in, but the machine does not support it then we don't support
16 keys, or do we?

Thanks,

	tglx

  parent reply	other threads:[~2015-12-08 18:44 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-04  1:14 [PATCH 00/34] x86: Memory Protection Keys (v5) Dave Hansen
2015-12-04  1:14 ` [PATCH 24/34] mm, multi-arch: pass a protection key in to calc_vm_flag_bits() Dave Hansen
2015-12-04  1:15 ` [PATCH 26/34] mm: implement new mprotect_key() system call Dave Hansen
     [not found]   ` <20151204011500.69487A6C-LXbPSdftPKxrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2015-12-05  6:50     ` Michael Kerrisk (man-pages)
     [not found]       ` <5662894B.7090903-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-12-07 16:44         ` Dave Hansen
2015-12-09 11:08           ` Michael Kerrisk (man-pages)
2015-12-09 15:48             ` Dave Hansen
     [not found]               ` <56684D3B.5050805-gkUM19QKKo4@public.gmane.org>
2015-12-09 16:45                 ` Michael Kerrisk (man-pages)
     [not found]                   ` <CAKgNAkiZHny4amNcamN+q6pxdanG9aMMA4H_pekA7+RDuoUvEA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-09 17:05                     ` Dave Hansen
2015-12-11 20:13                       ` Michael Kerrisk (man-pages)
2015-12-04  1:15 ` [PATCH 28/34] x86: wire up " Dave Hansen
     [not found]   ` <20151204011503.2A095839-LXbPSdftPKxrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2015-12-08 18:44     ` Thomas Gleixner [this message]
2015-12-08 19:06       ` Dave Hansen
     [not found]         ` <56672A50.4010801-gkUM19QKKo4@public.gmane.org>
2015-12-08 20:38           ` Thomas Gleixner
2015-12-04  1:15 ` [PATCH 31/34] x86, pkeys: allocation/free syscalls Dave Hansen
2015-12-04  1:15 ` [PATCH 32/34] x86, pkeys: add pkey set/get syscalls Dave Hansen
2015-12-04 23:31 ` [PATCH 00/34] x86: Memory Protection Keys (v5) Andy Lutomirski
     [not found]   ` <CALCETrXwVb99hAvqR2o54aPwtpr8oubROtiRt45SiYRfUTAxCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-04 23:38     ` Dave Hansen
     [not found]       ` <56622401.20001-gkUM19QKKo4@public.gmane.org>
2015-12-11 20:16         ` Andy Lutomirski

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