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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
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Build Status
Buildable 67931
Build 64814: 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 164577

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sys/amd64/vmm/vmm_cpuid.c

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