RE: [Qemu-devel] [Patch] Support translating Guest physical address to Host virtual address.

[Kleen, Andi]

>Yeah, but if we put a feature in qemu, we need to be able to 
>support it 
>for anyone who wants to use it.

It's useful for anyone who wants to use it for testing purposes.
And it's useful to make sure the qemu/kernel/kvm machine check
injection code works.

>Adding something for a very particular test suite that won't work in 
>normal circumstances is just asking for trouble IMHO.

RAS features generally need associated testing/injection hooks,
otherwise they don't get tested regularly enough and bitrot.

>I still don't really understand all the pieces that are 
>involved here.  
>Why do we need a guest physical address?  Are we testing 
>reflecting MCEs 
>from the host into a guest?  Since that functionality isn't in qemu 
>aren't we putting the cart before the horse here?

qemu has support for triggering MCEs on the monitor.

Also the KVM code base has support for forwarding the MCEs automatically.

-Andi