From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Paul Mackerras <paulus@samba.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH -V3 05/11] arch/powerpc: remove masking top 16 bit of va in tlb invalidate
Date: Mon, 23 Jul 2012 12:14:34 +0530 [thread overview]
Message-ID: <87d33nht7x.fsf@skywalker.in.ibm.com> (raw)
In-Reply-To: <20120723034912.GA5019@drongo>
Paul Mackerras <paulus@samba.org> writes:
> On Mon, Jul 23, 2012 at 11:22:08AM +1000, Benjamin Herrenschmidt wrote:
>> On Mon, 2012-07-23 at 09:56 +1000, Paul Mackerras wrote:
>> > > That indicate we should not mask the top 16 bits. So remove the
>> > same.
>> >
>> > Older versions of the architecture (2.02 and earler) require the
>> > masking, so we can't just unconditionally remove it, since that would
>> > potentially break POWER5 and PPC970. People are definitely still
>> > running Linux bare-metal on PPC970s (though arguably not on POWER5).
>>
>> Are you sure ? I couldn't convince myself ... the old architectures say
>> that it only uses some of the bits but it doesn't mark the other ones as
>> "reserved" (as in must be 0).
>>
>> (At least 1.x, I haven't looked at 2.x with x < 03)
>
> 2.01 and 2.02 say bits 0..15 must be zero.
is this 0..15 of va or 0..15 of AVA ?
if it is 0.. 15 then that clear bit is wrong right ? We are doing that
on a 64 bit va. So with that we already have ignored 0..14.
-aneesh
next prev parent reply other threads:[~2012-07-23 6:44 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 13:13 [PATCH -V3 0/11] arch/powerpc: Add 64TB support to ppc64 Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 01/11] arch/powerpc: Use hpt_va to compute virtual address Aneesh Kumar K.V
2012-07-22 23:17 ` Paul Mackerras
2012-07-09 13:13 ` [PATCH -V3 02/11] arch/powerpc: Simplify hpte_decode Aneesh Kumar K.V
2012-07-22 23:26 ` Paul Mackerras
2012-07-23 5:41 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 03/11] arch/powerpc: Convert virtual address to vpn Aneesh Kumar K.V
2012-07-09 22:41 ` Stephen Rothwell
2012-07-10 6:12 ` Aneesh Kumar K.V
2012-07-09 23:06 ` Stephen Rothwell
2012-07-10 6:15 ` Aneesh Kumar K.V
2012-07-22 23:42 ` Paul Mackerras
2012-07-23 5:54 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 04/11] arch/powerpc: Rename va " Aneesh Kumar K.V
2012-07-22 23:46 ` Paul Mackerras
2012-07-23 6:14 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 05/11] arch/powerpc: remove masking top 16 bit of va in tlb invalidate Aneesh Kumar K.V
2012-07-22 23:56 ` Paul Mackerras
2012-07-23 1:22 ` Benjamin Herrenschmidt
2012-07-23 3:49 ` Paul Mackerras
2012-07-23 6:44 ` Aneesh Kumar K.V [this message]
2012-07-23 6:48 ` Benjamin Herrenschmidt
2012-07-09 13:13 ` [PATCH -V3 06/11] arch/powerpc: Make KERN_VIRT_SIZE not dependend on PGTABLE_RANGE Aneesh Kumar K.V
2012-07-22 23:57 ` Paul Mackerras
2012-07-09 13:13 ` [PATCH -V3 07/11] arch/powerpc: Increase the slice range to 64TB Aneesh Kumar K.V
2012-07-23 0:00 ` Paul Mackerras
2012-07-23 7:13 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 08/11] arch/powerpc: Make some of the PGTABLE_RANGE dependency explicit Aneesh Kumar K.V
2012-07-23 0:20 ` Paul Mackerras
2012-07-23 7:29 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 09/11] arch/powerpc: Use 50 bits of VSID in slbmte Aneesh Kumar K.V
2012-07-23 0:06 ` Paul Mackerras
2012-07-23 8:21 ` Aneesh Kumar K.V
2012-07-23 9:36 ` Paul Mackerras
2012-07-23 10:22 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 10/11] arch/powerpc: Use 32bit array for slb cache Aneesh Kumar K.V
2012-07-23 0:27 ` Paul Mackerras
2012-07-23 8:25 ` Aneesh Kumar K.V
2012-07-09 13:13 ` [PATCH -V3 11/11] arch/powerpc: Add 64TB support Aneesh Kumar K.V
2012-07-23 0:15 ` Paul Mackerras
2012-07-23 8:49 ` Aneesh Kumar K.V
2012-07-23 9:39 ` Paul Mackerras
2012-07-23 10:22 ` Aneesh Kumar K.V
2012-07-23 11:06 ` Paul Mackerras
2012-07-24 8:37 ` Aneesh Kumar K.V
2012-07-24 9:14 ` Aneesh Kumar K.V
2012-07-24 19:50 ` Aneesh Kumar K.V
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