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x86/madt: allow Xen guest to use x2APIC mode
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Authored by royger on Jan 13 2022, 4:01 PM.

Details

Summary

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.

Test Plan

Tested by avg on an AWS Xen 4.2 instance, so I think it's safe now to
enable x2APIC when available by default on Xen.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.