From: Rob Gardner <rob.gardner@oracle.com>
To: Khalid Aziz <khalid.aziz@oracle.com>, David Miller <davem@davemloft.net>
Cc: corbet@lwn.net, akpm@linux-foundation.org,
dingel@linux.vnet.ibm.com, bob.picco@oracle.com,
kirill.shutemov@linux.intel.com, aneesh.kumar@linux.vnet.ibm.com,
aarcange@redhat.com, arnd@arndb.de, sparclinux@vger.kernel.org,
mhocko@suse.cz, chris.hyser@oracle.com, richard@nod.at,
vbabka@suse.cz, koct9i@gmail.com, oleg@redhat.com,
gthelen@google.com, jack@suse.cz, xiexiuqi@huawei.com,
Vineet.Gupta1@synopsys.com, luto@kernel.org,
ebiederm@xmission.com, bsegall@google.com, geert@linux-m68k.org,
dave@stgolabs.net, adobriyan@gmail.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)
Date: Mon, 7 Mar 2016 15:12:03 -0800 [thread overview]
Message-ID: <56DE0AC3.9070503@oracle.com> (raw)
In-Reply-To: <56DDF3C4.7070701@oracle.com>
On 03/07/2016 01:33 PM, Khalid Aziz wrote:
>
> That is a possibility but limited in scope. An address range covered
> by a single TTE can have large number of tags. Version tags are set on
> cacheline. In extreme case, one could set a tag for each set of
> 64-bytes in a page. Also tags are set completely in userspace and no
> transition occurs to kernel space, so kernel has no idea of what tags
> have been set.
...
> I have not found a way to query the MMU on tags.
>
To query the tag for a cache line, you just read it back with ldxa and
ASI_MCD_PRIMARY (ie, asi 0x90), basically the same way you stored the
tag in the first place.
Rob
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next prev parent reply other threads:[~2016-03-07 23:14 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 20:39 [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Khalid Aziz
2016-03-02 23:08 ` Julian Calaby
2016-03-03 0:25 ` Khalid Aziz
2016-03-03 0:48 ` Julian Calaby
2016-03-03 17:28 ` Khalid Aziz
2016-03-06 4:07 ` David Miller
2016-03-07 15:07 ` Khalid Aziz
2016-03-07 15:30 ` Rob Gardner
2016-03-07 15:43 ` Andy Lutomirski
2016-03-07 16:06 ` Khalid Aziz
2016-03-07 17:46 ` Dave Hansen
2016-03-07 17:53 ` Andy Lutomirski
2016-03-07 18:12 ` Dave Hansen
2016-03-07 18:39 ` Khalid Aziz
2016-03-07 18:53 ` Andy Lutomirski
2016-03-07 19:22 ` David Miller
2016-03-07 19:46 ` Khalid Aziz
2016-03-07 22:40 ` Dave Hansen
2016-03-08 1:31 ` Rob Gardner
2016-03-07 21:06 ` Khalid Aziz
2016-03-08 19:57 ` David Miller
2016-03-08 20:16 ` Khalid Aziz
2016-03-08 20:27 ` David Miller
2016-03-08 20:59 ` Khalid Aziz
2016-03-07 15:45 ` Khalid Aziz
2016-03-07 16:45 ` David Miller
2016-03-07 17:51 ` Khalid Aziz
2016-03-07 16:56 ` David Miller
2016-03-07 18:04 ` Khalid Aziz
2016-03-07 18:08 ` Andy Lutomirski
2016-03-07 18:22 ` Khalid Aziz
2016-03-07 18:49 ` Andy Lutomirski
2016-03-07 19:19 ` David Miller
2016-03-07 19:44 ` Khalid Aziz
2016-03-07 19:54 ` Andy Lutomirski
2016-03-07 20:41 ` Khalid Aziz
2016-03-07 20:58 ` David Miller
2016-03-07 21:02 ` Andy Lutomirski
2016-03-07 21:09 ` Khalid Aziz
2016-03-07 23:34 ` James Morris
2016-03-07 23:48 ` James Morris
2016-03-08 9:33 ` James Morris
2016-03-07 18:09 ` Rob Gardner
2016-03-07 18:24 ` Khalid Aziz
2016-03-07 19:16 ` David Miller
2016-03-07 21:33 ` Khalid Aziz
2016-03-07 21:38 ` David Miller
2016-03-07 23:13 ` Rob Gardner
2016-03-08 4:13 ` David Miller
2016-03-07 23:12 ` Rob Gardner [this message]
2016-03-07 23:27 ` Khalid Aziz
2016-03-08 0:21 ` Khalid Aziz
2016-03-08 4:24 ` David Miller
2016-03-07 23:32 ` Rob Gardner
2016-03-07 19:09 ` David Miller
2016-03-07 21:27 ` Khalid Aziz
2016-03-07 21:34 ` David Miller
2016-03-07 22:30 ` Khalid Aziz
2016-03-07 17:32 ` Dave Hansen
2016-03-07 17:35 ` Dave Hansen
2016-03-07 18:15 ` Khalid Aziz
2016-03-07 19:06 ` David Miller
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