KVM: Detect Extended Destination ID support
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Authored by cperciva on Feb 22 2026, 4:10 AM.

Details

Reviewers: None
Commits: rGfa4faeb0249c: KVM: Detect Extended Destination ID support
rG2931aabc40ea: KVM: Detect Extended Destination ID support
rG9ab5aa3d4c78: KVM: Detect Extended Destination ID support

Summary

KVM advertises support for the Extended Destination ID standard via
bit 15 of the value returned in the EAX register when KVM features
are queried via CPUID.

MFC after: 2 weeks

Diff Detail

Repository

rG FreeBSD src repository

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Unit

Tests Skipped

Build Status

Buildable 70926
Build 67809: arc lint + arc unit

Event Timeline

cperciva created this revision.Feb 22 2026, 4:10 AM

Herald added a subscriber: imp. · View Herald TranscriptFeb 22 2026, 4:10 AM

cperciva requested review of this revision.Feb 22 2026, 4:10 AM

cperciva added a parent revision: D55426: msi: Support APIC Extended Destination IDs.

cperciva added a child revision: D55428: x86/cpuid: add CPUID flag for Extended Destination ID support.

Harbormaster completed remote builds in B70866: Diff 172426.Feb 22 2026, 4:11 AM

Only enable if ext_dest_id is set to -1.

Harbormaster completed remote builds in B70926: Diff 172538.Feb 23 2026, 7:53 PM

cperciva mentioned this in D55429: Xen: Detect Extended Destination ID support.Feb 25 2026, 7:16 AM

cperciva edited parent revisions, added: D55889: io_apic: Support APIC Extended Destination IDs; removed: D55426: msi: Support APIC Extended Destination IDs.Mar 17 2026, 3:57 AM

Move detection code into local_apic.c

Harbormaster completed remote builds in B71440: Diff 173781.Mar 17 2026, 3:59 AM

This revision was not accepted when it landed; it landed in state Needs Review.Mar 28 2026, 5:57 AM

Closed by commit rG9ab5aa3d4c78: KVM: Detect Extended Destination ID support (authored by cperciva). · Explain Why

This revision was automatically updated to reflect the committed changes.

cperciva added a commit: rG9ab5aa3d4c78: KVM: Detect Extended Destination ID support.

cperciva added a commit: rG2931aabc40ea: KVM: Detect Extended Destination ID support.Apr 16 2026, 3:05 PM

cperciva added a commit: rGfa4faeb0249c: KVM: Detect Extended Destination ID support.Apr 16 2026, 3:12 PM

Revision Contents
Changeset List

Path

Size

sys/

x86/

include/

kvm.h

1 line

x86/

msi.c

12 lines

Diff 172538

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sys/x86/include/kvm.h