Unify mshv and whp partition features

Currently when creating a partition we depend a lot on default partition features for both whp and mshv, which can result in different features being exposed in the guest (linux and windows apis are different and enables/disables different things). We should:

Make sure we only enable want we need, disable the rest, and probably not rely on default features
Make sure mshv and whp do the same thing

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Examples:

LMCE is unconditionally disabled on whp, but is enabled on mshv (if enabled in firmware), unsure if this can expose MCG_EXT_CTL

Fixing the example above might look something like this, but should double check

let mut pr: mshv_create_partition_v2 = Default::default();

// ... existing pt_flags (LAPIC under hw-interrupts) ...

pr.pt_flags |= 1 << 3;           // MSHV_PT_BIT_CPU_AND_XSAVE_FEATURES
pr.pt_num_cpu_fbanks = 2;        // MSHV_NUM_CPU_FEATURES_BANKS
pr.pt_cpu_fbanks[1] |= 1 << 37;  // disable LocalMachineCheckSupport

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Unify mshv and whp partition features #1685

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Unify mshv and whp partition features #1685

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ludfjig commented on Jul 24, 2026

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