Re: [Xen-devel] [RFC PATCH v1 00/21] ARM: Add Xen NUMA support

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Feb 09, 2017 at 09:26:52PM +0530, vijay.kilari@xxxxxxxxx wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxx>
> 
> With this RFC patch series, NUMA support is added for arm platform.
> Both DT and ACPI based NUMA support is added.
> Only Xen is made aware of NUMA platform. Dom0 is awareness is not
> added.
> 
> As part of this series, the code under x86 architecture is
> reused by moving into common files.
> New files xen/common/numa.c and xen/commom/srat.c files are
> added which are common for both x86 and arm.
> 
> Patches 1 - 12 & 20 are for DT NUMA and 13 - 19 & 21 are for
> ACPI NUMA.
> 
> DT NUMA: The following major changes are performed
>  - Dropped numa-node-id information from Dom0 DT.
>    So that Dom0 devices make allocation from node 0 for
>    devmalloc requests.
>  - Memory DT is not deleted by EFI. It is exposed to Xen
>    to extract numa information.
>  - On NUMA failure, Fallback to Non-NUMA booting.
>    Assuming all the memory and CPU's are under node 0.
>  - CONFIG_NUMA is introduced.
> 
> ACPI NUMA:
>  - MADT is parsed before parsing SRAT table to extract
>    CPU_ID to MPIDR mapping info. In Linux, while parsing SRAT
>    table, MADT table is opened and extract MPIDR. However this
>    approach is not working on Xen it allows only one table to
>    be open at a time because when ACPI table is opened, Xen
>    maps to single region. So opening ACPI tables recursively
>    leads to overwriting of contents.

Huh? Why can't you use vmap APIs to map them?

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