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From: Michael Ellerman <mpe@ellerman.id.au>
To: Ram Pai <linuxram@us.ibm.com>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org,
	linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc: benh@kernel.crashing.org, paulus@samba.org,
	khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
	bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com,
	linuxram@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org,
	corbet@lwn.net, mingo@redhat.com
Subject: Re: [RFC v4 17/17] procfs: display the protection-key number associated with a vma
Date: Wed, 28 Jun 2017 11:50:13 +1000	[thread overview]
Message-ID: <87d19odgoa.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <1498558319-32466-18-git-send-email-linuxram@us.ibm.com>

Ram Pai <linuxram@us.ibm.com> writes:

> Display the pkey number associated with the vma in smaps of a task.
> The key will be seen as below:
>
> VmFlags: rd wr mr mw me dw ac key=0

Why wouldn't we just emit a "ProtectionKey:" line like x86 does?

See their arch_show_smap().

You should probably also do what x86 does, which is to not display the
key on CPUs that don't support keys.

cheers

  reply	other threads:[~2017-06-28  1:50 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-27 10:11 [RFC v4 00/17] powerpc: Memory Protection Keys Ram Pai
2017-06-27 10:11 ` [RFC v4 01/17] mm: introduce an additional vma bit for powerpc pkey Ram Pai
2017-06-27 10:54   ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 02/17] mm: ability to disable execute permission on a key at creation Ram Pai
2017-06-27 11:32   ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 03/17] x86: key creation with PKEY_DISABLE_EXECUTE disallowed Ram Pai
2017-06-27 11:32   ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 04/17] powerpc: Implement sys_pkey_alloc and sys_pkey_free system call Ram Pai
2017-06-27 10:11 ` [RFC v4 05/17] powerpc: store and restore the pkey state across context switches Ram Pai
2017-06-27 10:11 ` [RFC v4 06/17] powerpc: Implementation for sys_mprotect_pkey() system call Ram Pai
2017-06-27 10:11 ` [RFC v4 07/17] powerpc: make the hash functions protection-key aware Ram Pai
2017-06-27 10:11 ` [RFC v4 08/17] powerpc: Program HPTE key protection bits Ram Pai
2017-06-27 10:11 ` [RFC v4 09/17] powerpc: call the hash functions with the correct pkey value Ram Pai
2017-06-27 15:24   ` Aneesh Kumar K.V
2017-06-28  7:12     ` Ram Pai
2017-06-27 10:11 ` [RFC v4 10/17] powerpc: Macro the mask used for checking DSI exception Ram Pai
2017-06-27 10:11 ` [RFC v4 11/17] powerpc: Handle exceptions caused by pkey violation Ram Pai
2017-06-27 10:11 ` [RFC v4 12/17] powerpc: Deliver SEGV signal on " Ram Pai
2017-06-27 10:11 ` [RFC v4 13/17] selftest: Move protecton key selftest to arch neutral directory Ram Pai
2017-06-27 10:11 ` [RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys Ram Pai
2017-06-27 10:11 ` [RFC v4 15/17] Documentation: Move protecton key documentation to arch neutral directory Ram Pai
2017-06-27 10:11 ` [RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys Ram Pai
2017-06-27 10:11 ` [RFC v4 17/17] procfs: display the protection-key number associated with a vma Ram Pai
2017-06-28  1:50   ` Michael Ellerman [this message]
2017-06-27 10:46 ` [RFC v4 00/17] powerpc: Memory Protection Keys Balbir Singh

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