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

[Juergen Gross <jgross@xxxxxxxx>]

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?

I'd rather have a way to ask the hypervisor whether we are in PVH mode
(e.g. via CPUID or a hypercall to test for a devicemodel having itself
registered).

In case we need to set an indicator in zeropage I'd opt for reusing
X86_SUBARCH_XEN.


Juergen

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