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x86/madt: allow Xen guest to use x2APIC mode

Description

x86/madt: allow Xen guest to use x2APIC mode

The old bogus Xen versions that would deliver a GPF when writing to
the LAPIC MSR are likely retired, so it's safe to enable x2APIC
unconditionally now if available.

Tested by: avg
Reviewed by: kib
Sponsored by: Citrix Systems R&D
Differential revision: https://reviews.freebsd.org/D33877

Details

Provenance
roygerAuthored on Jan 13 2022, 1:54 PM
Reviewer
kib
Differential Revision
D33877: x86/madt: allow Xen guest to use x2APIC mode
Parents
rGca2a7262df5e: Free UMA zones when a pass(4) instance goes away.
Branches
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