svm_migrate_to_ram(9)

💅 svm_migrate_to_ram 💅

okay so bestie, welcome to the svm_migrate_to_ram(9) page — this is a Kernel API Manual entry and it's literally the CPU page fault handler, no cap. it lives in the kernel docs' section 9 and it's genuinely iconic once you get what it's doing. let's get into it 🫶

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✨ NAME ✨

svm_migrate_to_ram — CPU page fault handler 🔥

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✨ SYNOPSIS ✨

vm_fault_t svm_migrate_to_ram (struct vm_fault *vmf );

that's the whole signature, babe — one arg, one return type. clean. minimalist. main character energy. ✨

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🎀 ARGUMENTS 🎀

• vmf — the CPU vm fault vma + address. that's it, that's the whole vibe. it's the fault info struct and it's carrying both the vma and the address for you 🦋

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🌸 CONTEXT 🌸

where does this run?? in the vm fault handler, and — important — the caller holds the mmap read lock 🔒 so like, respect that, okay? the lock is already taken, don't go doing anything weird about it 💀

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⭐ RETURN ⭐

• 0 — OK, we're good, slay ✨
• VM_FAULT_SIGBUS — this is how it notices the application to have a SIGBUS page fault. dramatic but correct, honestly 😭

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🦋 SEE ALSO 🦋

the kernel file lives at ./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c — go read it, iykyk 💜

• svm_migrate_copy_memory_gart(9)
• svm_migrate_copy_done(9)
• svm_migrate_ram_to_vram(9)
• svm_migrate_vma_to_ram(9)
• svm_migrate_vram_to_ram(9)
• svm_migrate_vram_to_vram(9)

like a whole little migration friend group, honestly. go say hi to all of them 🧚

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and that's the page!! 🎀 this one came out of ./drivers/gpu/drm/amd/amdkfd, dated October 2026 — so go forth and fault those CPU pages, bestie, you're gonna ate 💅👑