Re: [Xen-devel] [PATCH 3/4] introduce boot parameter for setting XENFEAT_virtual_p2m

[Juergen Gross <jgross@xxxxxxxx>]

On 11/19/2014 10:04 PM, Konrad Rzeszutek Wilk wrote:
> On Fri, Nov 14, 2014 at 10:37:25AM +0100, Juergen Gross wrote:
> > Introduce a new boot parameter "virt_p2m" to be able to set
> > XENFEAT_virtual_p2m for a pv domain.
> >
> > As long as Xen tools and kdump don't support this new feature it is
> > turned off by default.
> Couldn't the dom0_large and dom0 be detected automatically? That is
> the dom0 could advertise it can do large-dom0 support and Xen would
> automatically switch to the right mode?
No, that's not the problem. Xen has to indicate it is capable to handle
the new mode. At dom0 construction time the dom0 kernel can't know about
the capability of kdump to handle the new mode.

In case the new interface is accepted I'll set up some kdump patches to
handle it. We can switch to dom0/dom0_large set on default if they are
accepted on time (e.g. at the time the kernel support for the new
interface is put in place).


Juergen


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