Re: [Xen-devel] [PATCH v2 1/3] x86/boot: add acpi rsdp address to setup_header

[Ingo Molnar <mingo@xxxxxxxxxx>]

* Jan Beulich <JBeulich@xxxxxxxx> wrote:

> >>> On 08.12.17 at 08:16, <mingo@xxxxxxxxxx> wrote:
> > Also, a more fundamental question: why doesn't Xen use EFI to hand over 
> > hardware configuration details?
> 
> Iirc the main purpose of the change here is to allow booting PVH
> (guest or Dom0) with Grub2 in the middle. PVH, at least for the
> time being, is something that gets away without any firmware
> (and I'm pretty certain this is going to remain that way for Dom0).
> ACPI tables are being built by the tool stack (guest) or hypervisor
> (Dom0). Hence there simply isn't any EFI which could be used to
> propagate such information.

Ok, that's fair enough. If hpa (or someone else) doesn't object to the boot 
protocol extension this approach looks good to me in principle.

Thanks,

        Ingo


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