STRUCT MSHV_CREATE_PARTITION_V2(9)

💅 struct mshv_create_partition_v2(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — yes it's a real manual, yes it's about a struct, and yes we're gonna get through it together. This one's struct mshv_create_partition_v2, and she's basically the glow-up edition of the partition-creation struct. Let's go 🎀

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✨ NAME ✨

struct mshv_create_partition_v2 — and that's it. That's the whole description. Literally just a dash in the original. No cap, the manpage author said "she speaks for herself" 💀. Iconic behaviour honestly.

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🌸 SYNOPSIS 🌸

struct mshv_create_partition_v2 {
    __u64 pt_flags;
    __u64 pt_isolation;
    __u16 pt_num_cpu_fbanks;
    __u8 pt_rsvd[6];
    __u64 pt_cpu_fbanks[MSHV_NUM_CPU_FEATURES_BANKS];
    __u64 pt_rsvd1[2];
  #if defined(__x86_64__);
    __u64 pt_disabled_xsave;
  #else;
    __u64 pt_rsvd2;
  #endif;
 };

look at her. gorgeous. the #if defined(__x86_64__); situation is doing a whole little x86-vs-everyone-else moment, and yes those semicolons really are there in the source, we do not touch them, we respect them 🫶

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🦋 Members 🦋

• pt_num_cpu_fbanks — bestie this one is not freestyle-able, okay? It must be set to MSHV_NUM_CPU_FEATURES_BANKS. Not a suggestion. Not a vibe. A requirement 💅
• pt_cpu_fbanks — the array of disabled processor feature banks. this is where you tell the kernel which CPU features you're saying "no thank you" to 🙈
• pt_disabled_xsave — and here's where the disabled xsave feature bits go. only exists on the __x86_64__ branch, so if you're not on x86_64 she's literally not invited (that slot is pt_rsvd2 instead) 🧚

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💖 Description 💖

okay so, the actual tea ☕: this struct is the extended version of the above initial MSHV_CREATE_PARTITION ioctl — think of the original as the base model and this one as the one with all the upgrade options unlocked ✨

Being the extended version means she allows for the following additional parameters:

• pt_cpu_fbanks and pt_disabled_xsave are both passed through as-is to the create partition hypercall. no processing, no remixing, no "let me just tidy that up for you" — straight through, unchanged, main character energy 👑

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⭐ Return ⭐

same as above original mshv_create_partition — yeah, she's not reinventing the return-value situation, she's just the v2 with extra fields. lowkey refreshing honestly 🌈

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🔥 SEE ALSO 🔥

• Kernel file ./include/uapi/linux/mshv.h
• struct mshv_create_partition(9)
• struct mshv_user_mem_region(9)
• struct mshv_gpap_access_bitmap(9)
• struct mshv_root_hvcall(9)
• struct mshv_run_vp(9)
• struct mshv_get_set_vp_state(9)

the whole mshv friend group honestly, they all show up together 🫶✨

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aaaand that's the page!! 🎀 this little beauty lives in ./include/uapi/linux, dated October 2026, and yes she really does sign her name at the bottom like a pop star — struct mshv...partition_v2(9), mwah 💋💜