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Re: [Xen-devel] [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH
- To: Paolo Bonzini <pbonzini@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Maran Wilson <maran.wilson@xxxxxxxxxx>, <x86@xxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <kvm@xxxxxxxxxxxxxxx>, <jgross@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 6 Dec 2018 23:36:27 +0000
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- Cc: thomas.lendacky@xxxxxxx, rdunlap@xxxxxxxxxxxxx, jpoimboe@xxxxxxxxxx, rkrcmar@xxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, luto@xxxxxxxxxx, hpa@xxxxxxxxx, tglx@xxxxxxxxxxxxx, bp@xxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, roger.pau@xxxxxxxxxx
- Delivery-date: Thu, 06 Dec 2018 23:36:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
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
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