__vcpu_put_switch_sysregs(9)

✨ __vcpu_put_switch_sysregs(9) ✨

okay bestie, this is the Kernel API Manual page for __vcpu_put_switch_sysregs(9), and it's highkey a sysregs slay. 💅

🦋 NAME 🦋

__vcpu_put_switch_sysregs — restore host system registers to the physical CPU. no cap, that's the name line. 🫶

🌸 SYNOPSIS 🌸

the signature is giving "short and powerful":

void __vcpu_put_switch_sysregs (struct kvm_vcpu *vcpu );

🎀 ARGUMENTS 🎀

• vcpu — The VCPU pointer. that's the whole list, bestie. 🫶

🔥 DESCRIPTION 🔥

okay so what does it actually do? It saves guest system registers that do not affect the host's execution. example: EL1 system registers on a VHE system where the host kernel runs at EL2. literally that exact case. 💖

and here's the tea: this function is called from KVM's vcpu_put function. deferring saving system register state until we're no longer running the VCPU avoids having to save them on every exit from the VM. the way that saves work >>>> 😭🔥

🌈 SEE ALSO 🌈

• Kernel file ./arch/arm64/kvm/hyp/vhe/sysreg-sr.c — go read the source, it's right there. 👀
• __vcpu_load_switch_sysregs(9) — the linked page, iconic behavior. ✨

mwah 💋 — cute sign-off time: source/version ./arch/arm64/kvm/hyp/vhe, date October 2026, page __vcpu_put_switch_sysregs(9). periodt. 🎀