kvm_s390_cpus_from_pv(9)

okay bestie 💖 welcome to kvm_s390_cpus_from_pv(9), straight outta the Kernel API Manual. This one is lowkey iconic: it takes a protected VM and converts, like, all of its protected vCPUs into non protected ones. no cap. ✨

🌸 NAME 🌸

kvm_s390_cpus_from_pv — convert all protected vCPUs in a protected VM to non protected. That's the whole assignment, and it ate. 💅

✨ SYNOPSIS ✨

int kvm_s390_cpus_from_pv (struct kvm *kvm , u16 *rc , u16 *rrc );

🎀 ARGUMENTS 🎀

• kvm — the VM whose protected vCPUs are to be converted. main character energy fr.
• rc — the return value for the RC field of the UVC, in case of error.
• rrc — the return value for the RRC field of the UVC, in case of error.

💅 DESCRIPTION 💅

okay so here's the vibe: it does not stop in case of error 😭 it literally tries to convert as many CPUs as possible. resilient queen behavior.

In case of error, the RC and RRC of the last error are returned. iykyk. 🫶

🔥 RETURN 🔥

Returns 0 in case of success, otherwise -EIO. periodt. 💀

🦋 SEE ALSO 🦋

Kernel file ./arch/s390/kvm/s390/s390.c — yes bestie, go peek at the source. 👑

• kvm_s390_update_topology_change_report(9)
• kvm_s390_cpus_to_pv(9)
• kvm_arch_vcpu_pre_fault_memory(9)
• kvm_test_age_gfn(9)
• kvm_age_gfn(9)
• kvm_unmap_gfn_range(9)

mwah 💋 cute lil sign-off: this page comes from ./arch/s390/kvm/s390, October 2026, for kvm_s390_cpus_from_pv(9). byeee 🫶🌈