Re: [Xen-devel] Linux Kernel Summit 2012 hallway talks - PV MMU, PVH, hpa, tglrx, stefano and me.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-12-07 at 17:05 +0000, Konrad Rzeszutek Wilk wrote:

>    Anyhow, once the PVH works - so can do SMP guests, does
>    properly interrupt delivery, etc, we would obsolete the PV MMU
>    mode in 5 years. This means that arch/x86/xen/p2m.c and arch/x86/xen/mmu.c
>    along with a host of paravirt interfaces would be #ifdef-ed out.
>    There would also be a note in the Documentation/deprecate-schedule
>    pointing that out. If everything time-wise aligns itself that
>    means 2013 is when PVH has it debut and will have its kinks worked
>    out. 2018 is when PV MMU would be obsoleted. The impact is that in
>    2018 users would need Intel VT-d or AMD VI-IOMMU capable machine to run
>    the latest Linux dom0 kernel with device drivers on x86.
>    You would still be able to run the ancient PV kernels (like 2.6.18) as
>    guests - just not as a dom0.

I'm not sure I follow -- why does this future change in mainline Linux
have any impact on other kernel trees and their ability to run as dom0?

Ian.


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