On 06/12/2018 23:30, Paolo Bonzini wrote: > On 07/12/18 00:11, Boris Ostrovsky wrote: >> On 12/6/18 5:49 PM, Paolo Bonzini wrote: >>> On 06/12/18 23:34, Boris Ostrovsky wrote: >>>> On 12/6/18 5:11 PM, Paolo Bonzini wrote: >>>> >>>>> and also >>>>> >>>>> depends on !EFI >>>>> >>>>> because even though in principle it would be possible to write a PVH >>>>> loader for UEFI, PVH's start info does not support the EFI handover >>>>> protocol. >>>> But we should be able to build the binary with both EFI and PVH? >>> Can you? It's a completely different binary format, the EFI handover >>> protocol is invoked via a special entry point and needs the Linux header >>> format, not ELF. >> Right, but I think it is desirable to be able to build both from the >> same config file. > Ah, "make bzImage" and use the vmlinux for PVH, because PVH fetches the > entry point from the special note. That's clever. :) > > I don't see why it should not work, and if so the "depends on !EFI" is > indeed unnecessary. We do strive for single binaries in the Xen world, because that is how people actually want to consume Xen. It is for this reason why a single xen.gz binary can be loaded as a straight ELF (including this PVH boot protocol), or via Multiboot 1 or 2, and even do full EFI if your bootloader is up to date on its Multiboot2 spec :) ~Andrew
