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SubjectRe: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test kernels
On Mon, 7 Nov 2011, Frank Ch. Eigler wrote:
>> The ABI design allows for that kind of flexible extensibility, and
>> it's one of its major advantages.
>>
>> What we *cannot* protect against is you relying on obscure details of
>> the ABI [...]
>
> Is there some documentation that clearly spells out which parts of the
> perf syscall userspace ABI are "obscure" and thus presumably
> changeable?

That's actually something the KVM and virtio folks have done a great job
with IMHO. Both ABIs are documented pretty extensively and the specs are
kept up to date.

I guess for perf ABI, "perf test" is the closest thing to a specification
so if your application is using something that's not covered by it, you
might be in trouble.

Pekka


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