KVM: PPC: Document KVM_PPC_GET_COMPAT_CAPS ioctl

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Add documentation for the KVM_PPC_GET_COMPAT_CAPS ioctl to the KVM API
documentation.

The ioctl exposes host processor compatibility modes supported for
nested KVM guests on PowerPC systems. The documentation covers error
code descriptions including E2BIG for forward compatibility,
KVM_PPC_COMPAT_CAPS_SIZE_VER0 as the minimum size floor, the rationale
for rejecting non-zero reserved fields to prevent ABI ambiguity, bit
numbering clarification for IBM MSB-0 convention, and KVM-specific
capability bit constants.

Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Reviewed-by: Gautam Menghani <gautam@linux.ibm.com>
Tested-by: Anushree Mathur <anushree.mathur@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260808161148.66673-5-amachhiw@linux.ibm.com

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Amit Machhiwal 2026-08-08 21:41:48 +05:30 • committed by Madhavan Srinivasan

parent 8735048f54

commit c1721e5842

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Documentation/virt/kvm/api.rst

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