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

[Juergen Gross]

On 03/11/17 19:35, Boris Ostrovsky wrote:
> On 11/03/2017 02:23 PM, Juergen Gross wrote:
>> On 03/11/17 19:19, Boris Ostrovsky wrote:
>>> On 11/03/2017 02:05 PM, Juergen Gross wrote:
>>>> So again the question: how to tell whether we are PVH or HVM in
>>>> init_hypervisor_platform()? ACPi tables are scanned way later...
>>> Can we make grub/OVMF append a boot option?
>>>
>>> Or set setup_header.hardware_subarch to something? We already have
>>> X86_SUBARCH_XEN but it is only used by PV.  Or we might be able to use
>>> hardware_subarch_data (will need to get a buy-in from x86 maintainers, I
>>> think).
>> But wouldn't this break the idea to reuse the native boot paths in
>> grub/OVMF without further modifications?
> 
> WDYM? We will have to have some sort of a plugin in either one to build
> the zeropage anyway. So we'd set hardware_subarch there, in addition to
> other things like setting memory and such.

But isn't the zeropage already being built? I admit that setting subarch
isn't a big deal, but using another entry with a passed-through pvh
start struct isn't either...


Juergen