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KVM: arm64: Track KVM IOCTLs and their associated KVM caps

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Track KVM IOCTLs (VM IOCTLs for now), and the associated KVM capability
that enables that IOCTL. Add a function that performs the lookup.

This will be used by CoCo VM Hypervisors (e.g., pKVM) to determine
whether a particular KVM IOCTL is allowed for its VMs.

Suggested-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
[maz: don't expose KVM_CAP_BASIC to userspace, and rely on NR_VCPUS
      as a proxy for this]
Link: https://patch.msgid.link/20251211104710.151771-8-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba
2025-12-11 10:47:07 +00:00
committed by Marc Zyngier
parent f4eee308c8
commit 8823485a69
2 changed files with 47 additions and 0 deletions
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2
arch/arm64/include/asm/kvm_host.h
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@@ -1655,4 +1655,6 @@ static __always_inline enum fgt_group_id __fgt_reg_to_group_id(enum vcpu_sysreg
p; \
})
long kvm_get_cap_for_kvm_ioctl(unsigned int ioctl, long *ext);
#endif /* __ARM64_KVM_HOST_H__ */