Re: [Xen-devel] Xen PVH support in grub2

[Roger Pau Monné]

On Fri, Sep 29, 2017 at 03:33:58PM +0000, Juergen Gross wrote:
> On 29/09/17 17:24, Roger Pau Monné wrote:
> > On Fri, Sep 29, 2017 at 02:46:53PM +0000, Juergen Gross wrote:
> > Then, I also wonder whether it would make sense for this grub to load
> > the kernel using the PVH entry point or the native entry point. Would
> > it be possible to boot a Linux kernel up to the point where cpuid can
> > be used inside of a PVH container?
> 
> I don't think today's Linux allows that. This has been discussed
> very thoroughly at the time Boris added PVH V2 support to the kernel.

OK, I'm not going to insist on that, but my plans for FreeBSD is to
make the native entry point capable of booting inside of a PVH
container up to the point where cpuid (or whatever method) can be used
to detect the environment.

Do you recall what's preventing the native entry point from booting
inside of a PVH container? If certain emulated devices not present are
needed at early boot we could look into either replacing them with
other options available inside of a PVH container, or as a last resort
making them available on a PVH container.

Roger.