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?