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hypervisor: vmm: mshv: Enable SMT for guests with threads_per_core > 1

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Set HV_PARTITION_CREATION_FLAG_SMT_ENABLED_GUEST when the guest
topology has more than one thread per core. This allows the
hypervisor to schedule guest VPs correctly on SMT-enabled hosts.

Without this flag, the hypervisor schedules guest VPs incorrectly,
causing SMT unusable.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-01-19 19:15:12 +01:00
committed by Rob Bradford
parent e3a2bf0870
commit a00189cf72
3 changed files with 10 additions and 0 deletions
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4
hypervisor/src/mshv/mod.rs
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@@ -307,6 +307,10 @@ impl hypervisor::Hypervisor for MshvHypervisor {
.__bindgen_anon_1
.set_nested_virt_support(1u64);
}
if _config.smt_enabled {
create_args.pt_flags |= 1 << MSHV_PT_BIT_SMT_ENABLED_GUEST;
}
}
// Modified feature bit fields are written back to create_args
for i in 0..create_args.pt_num_cpu_fbanks {