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

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rG7d06c761c8ab: x86/madt: allow Xen guest to use x2APIC mode

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.

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rG FreeBSD src repository

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Event Timeline

royger created this revision.Jan 13 2022, 4:01 PM

Herald added a subscriber: imp. · View Herald TranscriptJan 13 2022, 4:01 PM

royger requested review of this revision.Jan 13 2022, 4:01 PM

Harbormaster completed remote builds in B43901: Diff 101414.Jan 13 2022, 4:01 PM

kib accepted this revision.Jan 13 2022, 4:04 PM

This revision is now accepted and ready to land.Jan 13 2022, 4:04 PM

Closed by commit rG7d06c761c8ab: x86/madt: allow Xen guest to use x2APIC mode (authored by royger). · Explain WhyJan 13 2022, 4:16 PM

This revision was automatically updated to reflect the committed changes.

royger added a commit: rG7d06c761c8ab: x86/madt: allow Xen guest to use x2APIC mode.

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sys/

x86/

acpica/

madt.c

3 lines

Diff 101417

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x86/madt: allow Xen guest to use x2APIC modeClosedPublicActions