Re: [Xen-devel] [PATCH v2] x86/vlapic: Don't reset APIC ID when handling INIT signal

[Chao Gao <chao.gao@xxxxxxxxx>]

On Wed, Apr 19, 2017 at 03:41:41PM +0800, Chao Gao wrote:
>>> -    vlapic->hw.apic_base_msr = (MSR_IA32_APICBASE_ENABLE |
>>> -                                APIC_DEFAULT_PHYS_BASE);
>>> +    vlapic->hw.apic_base_msr |= APIC_DEFAULT_PHYS_BASE;
>>
>>Perhaps better move this ahead of the call to vlapic_reset() then
>>too.
>>
>>Remains the question (not answered by the SDM afaics): What
>>happens to the base address during reset?
>
>Actually, I don't know and that's also why I don't touch apic_base_msr in the
>first verson. Will try to get a confirmation from hardware guys.

According to the description about APIC base address in 
"ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (APIC) ->
"LOCAL APIC" -> "Local APIC Status and Location", the APIC base
address is set to 0xFEE00000H as a result of reset or power-up.

Thanks
Chao

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