STRUCT VM_MEMORY_MAPPING(9)

💖 struct vm_memory_mapping — NAME ✨

okay so bestie, this is the Kernel API Manual page for struct vm_memory_mapping, and it's literally the memory map between a User VM and the Service VM. that's the whole vibe. 🫶

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🌸 SYNOPSIS 🌸

like, here's the shape of it, exactly, no cap:

struct vm_memory_mapping {
    struct page     **pages;
    int npages;
    void *service_vm_va;
    u64 user_vm_pa;
    size_t size;
 };

(and yes the closing brace has that one little space in front of it, we don't question the struct's aesthetic choices 💅)

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🎀 Members 🎀

every field gets its moment, periodt:

• pages — the pages in the Service VM kernel. that's it, that's the field. ✨
• npages — the number of pages. we love a count. 🔢
• service_vm_va — virtual address in the Service VM kernel. iconic VA behavior. 🌈
• user_vm_pa — physical address in the User VM. yes, physical, not virtual, don't come for me. 💀
• size — the size of this memory region. it's giving "how big is the vibe." 🦋

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🔥 Description 🔥

okay so the main character here is HSM, and what HSM does is maintain memory mappings between a User VM GPA and the Service VM kernel VA — all of that is literally for accelerating the User VM GPA translation. like it's a whole little translator bestie living in the kernel. 🧚 no cap. ⭐

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👑 SEE ALSO 👑

go read these next, iykyk:

• Kernel file ./drivers/virt/acrn/acrn_drv.h
• struct vm_memory_region_op(9)
• struct vm_memory_region_batch(9)
• struct acrn_ioreq_buffer(9)
• struct acrn_ioreq_client(9)
• struct acrn_vm(9)

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and that's the page!! 🍓 this gorgeousness lives in ./drivers/virt/acrn and it's dated October 2026 — mark your calendars bestie, slay 💜🎀✨