linux-kernel - Re: [PATCH -v3 0/7] x86: Use BRK to pre mapping page table to make xen happy

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Message-ID: <20121030134442.GB27463@phenom.dumpdata.com>
Date:	Tue, 30 Oct 2012 09:44:43 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jacob Shin <jacob.shin@....com>, Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v3 0/7] x86: Use BRK to pre mapping page table to make
 xen happy

On Wed, Oct 10, 2012 at 11:13:45PM -0700, Yinghai Lu wrote:
> On Wed, Oct 10, 2012 at 9:40 AM, Stefano Stabellini
> <stefano.stabellini@...citrix.com> wrote:
> >
> > So you are missing the Xen patches entirely in this iteration of the
> > series?
> 
> please check updated for-x86-mm branch.
> 
> [PATCH -v4 00/15] x86: Use BRK to pre mapping page table to make xen happy
> 
> on top of current linus/master and tip/x86/mm2, but please zap last
> patch in that branch.

fyi, the way to do that is to revert it the offending patch.

So which branch should I try out? Do you have one with all of the
required patches so I can just do a 3.7-rc3 'git pull' and try it out?

> 
> 1. use brk to mapping first PMD_SIZE range.
> 2. top down to initialize page table range by range.
> 3. get rid of calculate page table, and find_early_page_table.
> 4. remove early_ioremap in page table accessing.
> 
> v2: changes, update xen interface about pagetable_reserve, so not
>    use pgt_buf_* in xen code directly.
> v3: use range top-down to initialize page table, so will not use
>    calculating/find early table anymore.
>    also reorder the patches sequence.
> v4: add mapping_mark_page_ro to fix xen, also move pgt_buf_* to init.c
>     and merge alloc_low_page()
> 
> could be found at:
>         git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
> for-x86-mm
> 
> Yinghai Lu (15):
>   x86, mm: Align start address to correct big page size
>   x86, mm: Use big page size for small memory range
>   x86, mm: Don't clear page table if next range is ram
>   x86, mm: only keep initial mapping for ram
>   x86, mm: Break down init_all_memory_mapping
>   x86, xen: Add xen_mapping_mark_page_ro
>   x86, mm: setup page table in top-down
>   x86, mm: Remove early_memremap workaround for page table accessing on 64bit
>   x86, mm: Remove parameter in alloc_low_page for 64bit
>   x86, mm: Merge alloc_low_page between 64bit and 32bit
>   x86, mm: Move min_pfn_mapped back to mm/init.c
>   x86, mm, xen: Remove mapping_pagatable_reserve
>   x86, mm: Add alloc_low_pages(num)
>   x86, mm: only call early_ioremap_page_range_init() one time on 32bit
>   x86, mm: Move back pgt_buf_* to mm/init.c
> 
>  arch/x86/include/asm/init.h          |    4 -
>  arch/x86/include/asm/pgtable.h       |    1 +
>  arch/x86/include/asm/pgtable_types.h |    1 -
>  arch/x86/include/asm/x86_init.h      |    2 +-
>  arch/x86/kernel/setup.c              |    2 +
>  arch/x86/kernel/x86_init.c           |    3 +-
>  arch/x86/mm/init.c                   |  321 +++++++++++++++-------------------
>  arch/x86/mm/init_32.c                |   76 ++++++--
>  arch/x86/mm/init_64.c                |  119 ++++---------
>  arch/x86/mm/mm_internal.h            |   11 ++
>  arch/x86/xen/mmu.c                   |   29 +---
>  11 files changed, 249 insertions(+), 320 deletions(-)
>  create mode 100644 arch/x86/mm/mm_internal.h
> --
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