kvm_s390_ch...dr_prot_real(9)

💖 kvm_s390_check_low_addr_prot_real(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this one's a little slice of s390 KVM magic, and honestly? It's giving "small function, big responsibility." Let's get into it 🫶

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🌸 NAME 🌸

kvm_s390_check_low_addr_prot_real — literally just checks for low-address protection 💅

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⭐ SYNOPSIS ⭐

int kvm_s390_check_low_addr_prot_real (struct kvm_vcpu *vcpu , unsigned
long gra );

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🎀 ARGUMENTS 🎀

• vcpu — the virtual cpu in question, your main character 👑
• gra — Guest real address, aka the address we're side-eyeing 🙈

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🦋 DESCRIPTION 🦋

So what it does is: it checks whether an address is subject to low-address protection, and if it is, it sets up vcpu->arch.pgm accordingly. No cap, that's the whole vibe check 🔥

Like, think of it as the bouncer at the club — is this address on the protected list or not? If yes, vcpu->arch.pgm gets set up so the guest finds out. Periodt 💅

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🌈 RETURN 🌈

• 0 — no protection exception, we're chilling 😌
• PGM_PROTECTION — protected 🚨 like, blocked, denied, protected, the whole thing

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✨ SEE ALSO ✨

Sending you to the group chat of related functions, all in the kernel file ./arch/s390/kvm/s390/gaccess.c:

• guest_translate_gva(9)
• guest_range_to_gpas(9)
• __cmpxchg_with_key(9)
• cmpxchg_guest_abs_with_key(9)
• guest_translate_address_with_key(9)
• check_gva_range(9)
• check_gpa_range(9)
• walk_guest_tables(9)
• __gaccess_shadow_fault(9)

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bestie reminder: low-address protection is real, and this function takes it very seriously 🫡

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and that's the page!! 💖 brought to you by ./arch/s390/kvm/s390, dated October 2026, filed under kvm_s390_ch...dr_prot_real(9) — mwah, go slay some address checks 🧚‍♀️🎀