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xen-devel
Re: [Xen-devel] [PATCH][HVMLOADER][DISCUSS] 8 way default rombios
On 7 Jun 2006, at 05:55, Wang, Winston L wrote:
Here is my suggestion for you:
If you want to add SMP support for MPS table, you need to check HVM
guest configuration file for the switches for acpi and vcpu =number:
if (vcpu !=1 &acpi=0)
build xen-(vcpu number)-way-bios
...
Just as Jun pointed out MPS table is used for old guest OS (plug and
play mode +APM) mode, not for ACPI,
The best way would be to do the same as the for our ACPI tables --
dynamically generate the CPU entries (LAPIC entries in case of ACPI
tables) when we know how many VCPUs the guest has been allocated.
This would get rid of multiple statically-compiled rombios images, each
of which only differs in CPU info in the MPS table. It could even be
hacked up without modifying rombios image -- e.g., hvmloader could scan
for and then modify the MPS table to insert secondary-processor
entries. It wouldn't be very hard to do.
In any case, I'll revert the earlier patch. Using a MPS table that
advertises 8 processors when a guest actually has fewer doesn't seem a
very wise idea.
-- Keir
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