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.

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

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.

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

Revision Contents
Changeset List

Path

Size

sys/

amd64/

vmm/

vmm_cpuid.c

17 lines

Diff 170237

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vmm/amd64: Bhyve returns bogus cpuid 8000_001D leafNeeds ReviewPublicActions