Re: [Xen-devel] Fix for 'acpi=off'

[Arun Sharma <arun.sharma@xxxxxxxxx>]

Puthiyaparambil, Aravindh wrote:
> I tried the acpi=off on my 2-by x86_64 box running 32-bit SLES9.
> Everything seems to work just fine except for a couple of pfn and page
> fault non-fatal errors.
>
> But with acpi=ht, Dom0 hangs while trying to bring up the SCSI devices.
> I have included debug output for both cases.
I think this is the issue you're running into:

> SMP mptable: no processors registered!
> BIOS bug, MP table errors detected!...
> ... disabling SMP support. (tell your hw vendor)
With acpi=off acpi_lapic is non-zero so this code works:

   /* ACPI may have already provided this data */
   if (!acpi_lapic)
           MP_processor_info(m);

But with acpi=ht, MP table processor info is ignored. I worked around it
by ignoring the processor entries in the MP table always and setting
num_processors=1.

        -Arun


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