Re: [Xen-devel] [PATCH] IOMMU/x86: per-domain control structure is not HVM-specific

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 03/05/16 10:59, Jan Beulich wrote:
>>>> On 03.05.16 at 11:36, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 02/05/16 13:55, Jan Beulich wrote:
>>> ... and hence should not live in the HVM part of the PV/HVM union. In
>>> fact it's not even architecture specific (there already is a per-arch
>>> extension type to it), so it gets moved out right to common struct
>>> domain.
>>>
>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> Yikes - this really does need fixing ASAP.
> The more interesting question here is how to deal with the stable
> trees: The patch, due to its size, doesn't really lend itself to
> backporting. Yet the alternative (mentioned in a remark in the
> original submission) would be pretty clumsy too.
>
> Opinions?

Once the structure layout has moved, the compiler (and/or grep) will
highlight all the other uses.

In this instance, I would be tempted to suggest that we just do a custom
backport for each stable tree.

The only thing a BUILD_BUG_ON() will do is force someone else to
backport this patch if it actually triggers.

~Andrew

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