x86_spec_ctrl_set_guest(9)

✨ NAME ✨

okay so this is the x86_spec_ctrl_set_guest(9) page from the Kernel API Manual — and the main character function is x86_spec_ctrl_set_guest: set speculation control registers for the guest 💅✨

🌸 SYNOPSIS 🌸

void x86_spec_ctrl_set_guest (u64 guest_virt_spec_ctrl );

🎀 ARGUMENTS 🎀

• guest_virt_spec_ctrl — the guest controlled bits of MSR_VIRT_SPEC_CTRL (they may get translated to MSR_AMD64_LS_CFG bits) 🫶

💅 DESCRIPTION 💅

the whole flex here is that it avoids writing to the MSR if the content/bits are the same 🎀 no cap, that’s literally the point.

🦋 SEE ALSO 🦋

• Kernel file ./arch/x86/include/asm/spec-ctrl.h 📁
• x86_spec_ctrl_restore_host(9) 👑

sign-off bestie: source/version ./arch/x86/include/asm, dated October 2026, page x86_spec_ctrl_set_guest(9) — slay and bye 💖✨