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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 09/29/2017 11:51 AM, Roger Pau Monné wrote:
> 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.

Very much IIRC one of the reasons was the fact that zeropage
(bootparams) needed to be properly formatted. And the hypercall page
needs to be set up.



-boris

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel