linux-kernel - Re: Question on the five-level page table support patches

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Message-Id: <20170424.180948.1311847745777709716.davem@davemloft.net>
Date:   Mon, 24 Apr 2017 18:09:48 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     glaubitz@...sik.fu-berlin.de
Cc:     kirill@...temov.name, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        dave.hansen@...el.com, luto@...capital.net, mhocko@...e.com,
        linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Question on the five-level page table support patches

From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Date: Mon, 24 Apr 2017 22:37:40 +0200

> Would be really nice to able to have a canonical solution for this issue,
> it's been biting us on SPARC for quite a while now due to the fact that
> virtual address space has been 52 bits on SPARC for a while now.

It's going to break again with things like ADI which encode protection
keys in the high bits of the 64-bit virtual address.

Reallly, it would be nice if these tags were instead encoded in the
low bits of suitably aligned memory allocations but I am sure it's to
late to do that now.