On 06/07/15 18:08, Lengyel, Tamas wrote:
>
>     Having said that (and with the understading that it is beyond the
>     scope
>     of this patch), a way to validate things like these is a good idea. I
>     wonder if, in a future patch, we could not have ./configure detect
>     these
>     things and simply disable the relevant VM_EVENT_FLAG constants with
>     #if(n)defs, for example. That way, you wouldn't be able to compile
>     code
>     that wouldn't work silently on platforms where that is the case.
>
>
> It would be something worth investigating, definitely.

It would be mad to conditionally compile out code based on the features
or lackthereof of the build machine.

For bits like this, there must be active negotiation between userspace
and the running hypervisor to see what it can support.  Imagine if the
user disabled the monitor trap feature in the BIOS?  Userspace cannot
possibly assume that because it is running on Intel, that the feature is
present and usable.
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