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[DO NOT REVIEW] cpu_profile: pin amd.genoa.v2 for Genoa hosts without the TSA immunities #4769

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Merged
Pedro Henrique Penna (ppenna) merged 2 commits into from
Oct 27, 2026
Merged

[DO NOT REVIEW] cpu_profile: pin amd.genoa.v2 for Genoa hosts without the TSA immunities #4769

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6895776
cpu_profile: pin amd.genoa.v2 for Genoa hosts without the TSA immunities
esaurez Oct 7, 2026
d2338ea
cpu_profile: record a Genoa WHP host that amd.genoa.v2 serves
ppenna Oct 27, 2026
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12 changes: 8 additions & 4 deletions Guide/src/user_guide/openvmm/snapshots.md
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Original file line number Diff line number Diff line change
Expand Up @@ -320,10 +320,14 @@ generation: family 6, model 85, steppings 0 to 4), `intel.icelake-sp.v1`
(Xeon Scalable, third generation: 6/106), `intel.emeraldrapids.v1` (Xeon
Scalable, fifth generation: 6/207), `intel.alderlake.v1` (Core, twelfth
generation: 6/151 and 6/154), `amd.milan.v1` (AMD EPYC, third generation:
25/1), `amd.genoa.v1` (AMD EPYC, fourth generation: 25/17), and
`amd.turin.v1` (AMD EPYC, fifth generation: 26/2). `--cpu-profile <ID>`
selects one; the default, `auto`, selects the profile of the host's
generation. An Intel or AMD host without one boots on a host profile
25/1), `amd.genoa.v1` and `amd.genoa.v2` (AMD EPYC, fourth generation:
25/17), and `amd.turin.v1` (AMD EPYC, fifth generation: 26/2).
`amd.genoa.v2` drops what `amd.genoa.v1` presents in `0x80000021`, `LFENCE`
serialization and the TSA immunities, which not every Genoa host's
hypervisor presents. `--cpu-profile <ID>` selects one; the default,
`auto`, selects the latest revision of the host's generation's profile. An
earlier revision stays pinned, so its snapshots still restore. An Intel or
AMD host that no pinned profile serves boots on a host profile
instead: `auto` falls back to the profile that `--cpu-profile host`
selects, for which OpenVMM fingerprints the backend on this host, as
`--cpu-fingerprint` does, and applies the pinned profiles' derivation policy
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