Re: [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH

[Boris Ostrovsky]

On 12/6/18 5:11 PM, Paolo Bonzini wrote:
> On 06/12/18 07:04, Maran Wilson wrote:
>> +config PVH
>> +	bool "Support for running PVH guests"
>> +	---help---
>> +	  This option enables the PVH entry point for guest virtual machines
>> +	  as specified in the x86/HVM direct boot ABI.
>> +
> IIUC this breaks "normal" bzImage boot, so we should have something like
>
> 	The resulting kernel will not boot with most x86 boot loaders
> 	such as GRUB 


Grub support for PVH guests (for Xen) is well under way.


> or SYSLINUX.  Unless you plan to start the kernel
> 	using QEMU or Xen, you probably want to say N here.

I think PVH should not be user-selectable at all. It should be selected
by either XEN_PVH or KVM_GUEST_PVH (which you suggested to drop).

>
> 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?

-boris