Re: [PATCH v3 6/9] x86/smpboot: Support parallel startup of secondary CPUs

[David Woodhouse]

On Thu, 2021-12-16 at 08:24 -0600, Tom Lendacky wrote:

> This will break an SEV-ES guest because CPUID will generate a #VC and a 
> #VC handler has not been established yet.
> 
> I guess for now, you can probably just not enable parallel startup for 
> SEV-ES guests.

OK, thanks. I'll expand it to allow 24 bits of (physical) APIC ID then,
since it's no longer limited to CPUs without X2APIC. Then we can
refrain from doing parallel bringup for SEV-ES guests, as you suggest.

What precisely is the check I should be using for that?

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