[Xen-devel] Re: [Xen-ia64-devel] [Patch 0/2] Disable ACPI SRAT, SLIT on dom0

[Alex Williamson <alex.williamson@xxxxxx>]

On Fri, 2007-07-27 at 03:06 +0900, Akio Takebe wrote:
> Hi, Keir, Alex and all
> 
> On some ia64 NUMA machine, we cannot boot dom0.
> This issue is caused by different infomation LSAPIC and SRAT.
> Xen-ia64 modify LSAPIC IDs of dom0, but it does not modify SRAT.
> 
> Currently, credit scheduler does not consider NUMA system.
> And Xen-ia64 pass raw ACPI SRAT, SLIT infomation to dom0.
> If xen pass NUMA infomation to dom0, dom0 cannot move properly
> because vcpus can migrate and memory mapping is virtualized.
> So we decide disabling SRAT, SLIT of dom0 as first step of NUMA work.

   Would it make more sense to create the acpi_table_disable() and
support functions in the common acpi code?  The only ia64 specific parts
of the implementation appear to be writing "XenIPF" for the OEM ID and
calling generate_acpi_checksum().  The latter could easily be moved, or
maybe we could make use of acpi_table_compute_checksum().  The new OEM
ID could be passed into the function, but it might be just as useful to
write the original table signature into the OEM ID field so we know what
it was (ex. "xSRATx").  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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