On 23/06/2015 12:31, Andre Przywara wrote:
>> > 
>> > Because it's not part of the kernel API, never was, still isn't.
> Technically it may not - if I get this correctly it is more a platform
> API defined by the architecture, like ACPI or PSCI on ARM.
> But if I get this correctly Linux re-uses those definitions in the KVM
> API, by piggy-backing on the existing hypercalls. Please correct me if I
> am wrong here, I am looking at arch/powerpc/kvm/book3s_hv.c, where it
> seems to trap those hypercalls.
> 
> So I think that - though not originally invented or defined by Linux -
> it should export those definitions that KVM (re-)uses.
> QEMU also has a header file duplicating those definitions, so I support
> the idea of an uapi header.

Right, the same is true for other headers: include/scsi/scsi.h and
include/uapi/linux/virtio_*.h come to mind.

Paolo
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