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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Maran Wilson <maran.wilson@oracle.com>, <x86@kernel.org>,
	<linux-kernel@vger.kernel.org>, <xen-devel@lists.xenproject.org>,
	<kvm@vger.kernel.org>, <jgross@suse.com>
Cc: <thomas.lendacky@amd.com>, <dave.hansen@linux.intel.com>,
	<rkrcmar@redhat.com>, <hpa@zytor.com>, <mingo@redhat.com>,
	<rdunlap@infradead.org>, <luto@kernel.org>, <jpoimboe@redhat.com>,
	<tglx@linutronix.de>, <bp@suse.de>,
	<kirill.shutemov@linux.intel.com>, <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH
Date: Thu, 6 Dec 2018 23:36:27 +0000	[thread overview]
Message-ID: <ba735c9c-5b51-2496-ce07-6fd37eec9d73@citrix.com> (raw)
In-Reply-To: <cef985c3-a687-c1af-83ac-2c71af45a366@redhat.com>

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

  reply	other threads:[~2018-12-06 23:36 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-06  6:02 [PATCH v8 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-12-06  6:04 ` [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH Maran Wilson
2018-12-06 22:11   ` Paolo Bonzini
2018-12-06 22:34     ` Boris Ostrovsky
2018-12-06 22:49       ` Paolo Bonzini
2018-12-06 23:11         ` Boris Ostrovsky
2018-12-06 23:30           ` Paolo Bonzini
2018-12-06 23:36             ` Andrew Cooper [this message]
2018-12-07  6:02     ` Juergen Gross
2018-12-07 13:41       ` Paolo Bonzini
2018-12-07 13:50         ` Juergen Gross
2018-12-07 13:52           ` Paolo Bonzini
2018-12-07 13:58             ` Juergen Gross
2018-12-07 15:14               ` Paolo Bonzini
2018-12-07 18:21                 ` Maran Wilson
2018-12-06  6:04 ` [PATCH v8 2/7] xen/pvh: Move PVH entry code out of Xen specific tree Maran Wilson
2018-12-06  6:05 ` [PATCH v8 3/7] xen/pvh: Create a new file for Xen specific PVH code Maran Wilson
2018-12-06  6:05 ` [PATCH v8 4/7] xen/pvh: Move Xen specific PVH VM initialization out of common file Maran Wilson
2018-12-06  6:05 ` [PATCH v8 5/7] xen/pvh: Move Xen code for getting mem map via hcall " Maran Wilson
2018-12-06  6:06 ` [PATCH v8 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct Maran Wilson
2018-12-06  6:06 ` [PATCH v8 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-12-06 22:05   ` Paolo Bonzini
2018-12-06 21:21 ` [PATCH v8 0/7] " Paolo Bonzini
2018-12-06 21:37   ` Borislav Petkov
2018-12-06 21:58     ` Boris Ostrovsky
2018-12-06 22:14       ` Paolo Bonzini
2018-12-07 10:25         ` Borislav Petkov
2018-12-07 16:07           ` [Xen-devel] " Boris Ostrovsky
2018-12-07 19:22             ` Borislav Petkov
2018-12-12 18:09   ` Maran Wilson
2018-12-12 18:17     ` Boris Ostrovsky
2018-12-13 13:13     ` Paolo Bonzini

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