From: Paul Mackerras <paulus@ozlabs.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: benh@kernel.crashing.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH V3 09/10] powerpc/mm: Lower the max real address to 53 bits
Date: Tue, 28 Mar 2017 16:32:40 +1100 [thread overview]
Message-ID: <20170328053240.cp4qlh3bphaxikxr@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <1490117400-9891-9-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
On Tue, Mar 21, 2017 at 10:59:59PM +0530, Aneesh Kumar K.V wrote:
> Max value supported by hardware is 51 bits address. Radix page table define
> a slot of 57 bits for future expansion. We restrict the value supported in
> linux kernel 53 bits, so that we can use the bits between 57-53 for storing
> hash linux page table bits. This is done in the next patch.
>
> This will free up the software page table bits to be used for features
> that are needed for both hash and radix. The current hash linux page table
> format doesn't have any free software bits. Moving hash linux page table
> specific bits to top of RPN field free up the software bits for other purpose.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
next prev parent reply other threads:[~2017-03-28 5:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-21 17:29 [PATCH V3 01/10] powerpc/mm/nohash: MM_SLICE is only used by book3s 64 Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 02/10] powerpc/mm/slice: Fix off-by-1 error when computing slice mask Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 03/10] powerpc/mm: Cleanup bits definition between hash and radix Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 04/10] powerpc/mm/radix: rename _PAGE_LARGE to R_PAGE_LARGE Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 05/10] powerpc/mm: Add translation mode information in /proc/cpuinfo Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 06/10] powerpc/mm/hugetlb: Filter out hugepage size not supported by page table layout Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 07/10] powerpc/mm: Define _PAGE_SOFT_DIRTY unconditionally Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 08/10] powerpc/mm: Define all PTE bits based on radix definitions Aneesh Kumar K.V
2017-03-21 17:29 ` [PATCH V3 09/10] powerpc/mm: Lower the max real address to 53 bits Aneesh Kumar K.V
2017-03-28 5:32 ` Paul Mackerras [this message]
2017-03-21 17:30 ` [PATCH V3 10/10] powerpc/mm: Move hash specific pte bits to be top bits of RPN Aneesh Kumar K.V
2017-03-28 5:33 ` Paul Mackerras
2017-04-03 10:13 ` [V3,01/10] powerpc/mm/nohash: MM_SLICE is only used by book3s 64 Michael Ellerman
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