linux-kernel - Re: [RESEND Patch V3 00/15] xen: support pv-domains larger than 512GB

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Date:	Fri, 15 May 2015 14:17:45 +0200
From:	Juergen Gross <jgross@...e.com>
To:	xen-devel@...ts.xensource.com, konrad.wilk@...cle.com,
	david.vrabel@...rix.com, boris.ostrovsky@...cle.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND Patch V3 00/15] xen: support pv-domains larger than 512GB

Ping?

On 05/04/2015 10:23 AM, Juergen Gross wrote:
> Support 64 bit pv-domains with more than 512GB of memory.
>
> Tested with 64 bit dom0 on machines with 8GB and 1TB and 32 bit dom0 on a
> 8GB machine. Conflicts between E820 map and different hypervisor populated
> memory areas have been tested via a fake E820 map reserved area on the
> 8GB machine.
>
> Changes in V3:
> - rename xen_chk_e820_reserved() to xen_is_e820_reserved() as requested by
>    David Vrabel
> - add __initdata tag to global variables in patch 10
> - move initrd conflict checking after reserving p2m memory (patch 11)
>
> Changes in V2:
> - some clarifications and better explanations in commit messages
> - add header changes of include/xen/interface/xen.h (patch 01)
> - add wmb() when incrementing p2m_generation (patch 02)
> - add new patch 03 (don't build mfn tree if tools don't need it)
> - add new patch 06 (split counting of extra memory pages from remapping)
> - add new patch 07 (check memory area against e820 map)
> - replace early_iounmap() with early_memunmap() (patch 07->patch 08)
> - rework patch 09 (check for kernel memory conflicting with memory layout)
> - rework patch 10 (check pre-allocated page tables for conflict with memory map)
> - combine old patches 08 and 11 into patch 11
> - add new patch 12 (provide early_memremap_ro to establish read-only mapping)
> - rework old patch 12 (if p2m list located in to be remapped region delay
>    remapping) to copy p2m list in case of a conflict (now patch 13)
> - correct Kconfig dependency (patch 13->14)
> - don't limit dom0 to 512GB (patch 13->14)
> - modify parameter parsing to work in very early boot (patch 13->14)
> - add new patch 15 to do some cleanup
> - remove old patch 05 (simplify xen_set_identity_and_remap() by using global
>    variables)
> - remove old patch 08 (detect pre-allocated memory interfering with e820 map)
>
>
> Juergen Gross (15):
>    xen: sync with xen headers
>    xen: save linear p2m list address in shared info structure
>    xen: don't build mfn tree if tools don't need it
>    xen: eliminate scalability issues from initial mapping setup
>    xen: move static e820 map to global scope
>    xen: split counting of extra memory pages from remapping
>    xen: check memory area against e820 map
>    xen: find unused contiguous memory area
>    xen: check for kernel memory conflicting with memory layout
>    xen: check pre-allocated page tables for conflict with memory map
>    xen: check for initrd conflicting with e820 map
>    mm: provide early_memremap_ro to establish read-only mapping
>    xen: move p2m list if conflicting with e820 map
>    xen: allow more than 512 GB of RAM for 64 bit pv-domains
>    xen: remove no longer needed p2m.h
>
>   Documentation/kernel-parameters.txt  |   7 +
>   arch/x86/include/asm/xen/interface.h |  96 +++++++-
>   arch/x86/include/asm/xen/page.h      |   8 +-
>   arch/x86/xen/Kconfig                 |  20 +-
>   arch/x86/xen/mmu.c                   | 367 +++++++++++++++++++++++++++++--
>   arch/x86/xen/p2m.c                   |  43 +++-
>   arch/x86/xen/p2m.h                   |  15 --
>   arch/x86/xen/setup.c                 | 414 ++++++++++++++++++++++++++---------
>   arch/x86/xen/xen-head.S              |   2 +
>   arch/x86/xen/xen-ops.h               |   6 +
>   include/asm-generic/early_ioremap.h  |   2 +
>   include/asm-generic/fixmap.h         |   3 +
>   include/xen/interface/xen.h          |  10 +-
>   mm/early_ioremap.c                   |  11 +
>   14 files changed, 822 insertions(+), 182 deletions(-)
>   delete mode 100644 arch/x86/xen/p2m.h
>

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