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xen-devel
Re: [Xen-devel] [PATCH] Disable SMP on the MacBook by default
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> writes:
> On 13/9/06 23:11, "Marco Gerards" <mgerards@xxxxxxxxx> wrote:
>
>> The second core can not be initialized because the INIT IPI does not
>> arrive. It only happens on the MacBook and not on the desktop Intel
>> Macs. On the MacBook the second core is put into deep sleep mode. It
>> should get out of sleep mode when an IPI or interrupt is received.
>>
>> That does not happen. It looks like the keyboard interrupt does
>> wakeup the second core, after which the IPI is received.
>
> Have you tried tickling the second core with some interrupt or NMI IPIs from
> the boot core? Sounds like a slightly harder kick is required.
Yes I did try NMI IPIs, that did not have any effect. IIRC I tried
generating interrupts using the APIC, but I do not remember if I
succeed, but if I did it didn't fix the problem.
Is there any other way I can have a look at to easily generate an
interrupt without causing weird side effects?
> What about tracing what the Linux ACPI interpreter kicks out in terms of
> hardware accesses? Perhaps you can work out what the ACPI goop actually does
> in low-level terms, which could then perhaps be applied in a simpler form
> (than ACPI interpreting) to Xen?
How would that work? To be honest I do not know much about ACPI and
what's possible with it. A few pointers to get me started is highly
appreciated.
Thanks,
Marco
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