From: David Miller <davem@davemloft.net>
To: dave.hansen@linux.intel.com
Cc: khalid.aziz@oracle.com, corbet@lwn.net, arnd@arndb.de,
akpm@linux-foundation.org, hpa@zytor.com,
viro@zeniv.linux.org.uk, nitin.m.gupta@oracle.com,
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sowmini.varadhan@oracle.com, mike.kravetz@oracle.com,
adam.buchbinder@gmail.com, minchan@kernel.org, hughd@google.com,
kirill.shutemov@linux.intel.com, keescook@chromium.org,
allen.pais@oracle.com, aryabinin@virtuozzo.com,
atish.patra@oracle.com, joe@perches.com, pmladek@suse.com,
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linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
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Subject: Re: [PATCH v4 0/4] Application Data Integrity feature introduced by SPARC M7
Date: Mon, 16 Jan 2017 23:42:13 -0500 (EST) [thread overview]
Message-ID: <20170116.234213.651609572218128435.davem@davemloft.net> (raw)
In-Reply-To: <621cfed0-3e56-13e6-689a-0637bce164fe@linux.intel.com>
From: Dave Hansen <dave.hansen@linux.intel.com>
Date: Wed, 11 Jan 2017 08:33:30 -0800
> Is there a cost in the hardware associated with doing this "ADI
> checking"? For instance, instead of having this new mprotect()
> interface, why not just always set TTE.mcd on all PTEs?
If we did this then for every page mapped into userspace we'd have
to explicitly set all of the tags to zero, otherwise we'd get TAG
mismatch exceptions.
That would be like clearing the every mapped anonymous page twice, or
worse.
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prev parent reply other threads:[~2017-01-17 4:42 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-11 16:12 Khalid Aziz
2017-01-11 16:12 ` [PATCH v4 2/4] mm: Add function to support extra actions on swap in/out Khalid Aziz
2017-01-11 16:56 ` Dave Hansen
2017-01-11 17:15 ` Khalid Aziz
2017-01-11 16:12 ` [PATCH v4 4/4] sparc64: Add support for ADI (Application Data Integrity) Khalid Aziz
2017-01-17 4:39 ` David Miller
2017-01-17 19:32 ` Khalid Aziz
2017-01-17 19:42 ` David Miller
2017-01-17 20:12 ` Khalid Aziz
2017-01-18 0:14 ` Khalid Aziz
2017-01-11 16:33 ` [PATCH v4 0/4] Application Data Integrity feature introduced by SPARC M7 Dave Hansen
2017-01-11 16:56 ` Khalid Aziz
2017-01-11 18:13 ` Dave Hansen
2017-01-11 18:50 ` Khalid Aziz
2017-01-11 19:11 ` Dave Hansen
2017-01-12 0:22 ` Khalid Aziz
2017-01-12 0:49 ` Dave Hansen
2017-01-12 16:50 ` Khalid Aziz
2017-01-12 17:53 ` Dave Hansen
2017-01-13 0:22 ` Khalid Aziz
2017-01-13 1:31 ` Rob Gardner
2017-01-13 14:48 ` Khalid Aziz
2017-01-13 15:29 ` Rob Gardner
2017-01-13 15:59 ` Khalid Aziz
2017-01-13 16:08 ` Dave Hansen
2017-01-13 17:36 ` Rob Gardner
2017-01-17 4:47 ` David Miller
2017-01-17 21:43 ` Khalid Aziz
2017-01-17 4:42 ` David Miller [this message]
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