linux-kernel - Re: [RFC v5 00/38] powerpc: Memory Protection Keys

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Message-ID: <1499808649.2865.31.camel@kernel.crashing.org>
Date:   Wed, 12 Jul 2017 07:30:49 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Ram Pai <linuxram@...ibm.com>, Michal Hocko <mhocko@...nel.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        paulus@...ba.org, mpe@...erman.id.au, khandual@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        dave.hansen@...el.com, hbabu@...ibm.com, arnd@...db.de,
        akpm@...ux-foundation.org, corbet@....net, mingo@...hat.com
Subject: Re: [RFC v5 00/38] powerpc: Memory Protection Keys

On Tue, 2017-07-11 at 12:32 -0700, Ram Pai wrote:
> Ideally the MMU looks at the PTE for keys, in order to enforce
> protection. This is the case with x86 and is the case with power9 Radix
> page table. Hence the keys have to be programmed into the PTE.

POWER9 radix doesn't currently support keys.

Cheers,
Ben.