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Differential D53210

vmm/amd64: Bhyve returns bogus cpuid 8000_001D leaf
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Authored by rosenfeld_grumpf.hope-2000.org on Oct 20 2025, 7:59 AM.
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Subscribers
bcran
imp
rgrimes

Details

Reviewers
emaste
corvink
markj
chuck
Group Reviewers
bhyve
Summary

This is a port of this bhyve improvement coming from illumos:

16223 bhyve returns bogus cpuid 8000_001D leaf
https://www.illumos.org/issues/16223

This fixes an issue in the CPUID emulation discovered on AMD CPUs.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Skipped
Unit
Tests Skipped
Build Status
Buildable 70060
Build 66943: arc lint + arc unit

Event Timeline

rosenfeld_grumpf.hope-2000.org created this revision.Oct 20 2025, 7:59 AM
Herald added a reviewer: bhyve. · View Herald TranscriptOct 20 2025, 7:59 AM
Herald added subscribers: bcran, rgrimes, imp. · View Herald Transcript
rosenfeld_grumpf.hope-2000.org requested review of this revision.Oct 20 2025, 7:59 AM
Harbormaster completed remote builds in B67931: Diff 164577.Oct 20 2025, 7:59 AM
corvink accepted this revision.Oct 21 2025, 6:25 AM

Please descripe the bug and expected behavior in more detail in the commit message.

This revision is now accepted and ready to land.Oct 21 2025, 6:25 AM
rosenfeld_grumpf.hope-2000.org retitled this revision from vmm/amd64: port illumos#16223: bhyve returns bogus cpuid 8000_001D leaf to vmm/amd64: Bhyve returns bogus cpuid 8000_001D leaf.Jan 22 2026, 3:55 PM
rosenfeld_grumpf.hope-2000.org added reviewers: markj, chuck.
rosenfeld_grumpf.hope-2000.org updated this revision to Diff 170237.Jan 22 2026, 3:56 PM

Update commit message.

This revision now requires review to proceed.Jan 22 2026, 3:56 PM
Harbormaster completed remote builds in B70060: Diff 170237.Jan 22 2026, 3:56 PM
rosenfeld_grumpf.hope-2000.org updated this revision to Diff 175266.Apr 10 2026, 6:33 PM

Rebase.

Harbormaster completed remote builds in B72119: Diff 175266.Apr 10 2026, 6:34 PM
corvink accepted this revision.Apr 20 2026, 6:41 AM
This revision is now accepted and ready to land.Apr 20 2026, 6:41 AM
rosenfeld_grumpf.hope-2000.org updated this revision to Diff 187990.Tue, Sep 29, 12:57 PM

Rebase.

This revision now requires review to proceed.Tue, Sep 29, 12:57 PM
Harbormaster completed remote builds in B77443: Diff 187990.Tue, Sep 29, 12:57 PM

Revision Contents
Changeset List

PathSize
sys/
amd64/
vmm/
17 lines

Diff 170237

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sys/amd64/vmm/vmm_cpuid.c

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