linux-kernel - Re: EFI and multiboot2 devlopment work for Xen

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Message-Id: <830D780E-6D6A-4398-B736-7E1D87C40EF7@oracle.com>
Date:	Wed, 23 Oct 2013 01:28:40 -0700
From:	Seth Goldberg <seth.goldberg@...cle.com>
To:	The development of GNU GRUB <grub-devel@....org>
Cc:	"Vladimir 'φ-coder/phcoder' Serbinenko" 
	<phcoder@...il.com>,
	The development of GNU GRUB <grub-devel@....org>,
	"keir@....org" <keir@....org>,
	"david.woodhouse@...el.com" <david.woodhouse@...el.com>,
	"stefano.stabellini@...citrix.com" <stefano.stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ross.philipson@...rix.com" <ross.philipson@...rix.com>,
	"jbeulich@...e.com" <jbeulich@...e.com>,
	"boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"richard.l.maliszewski@...el.com" <richard.l.maliszewski@...el.com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>
Subject: Re: EFI and multiboot2 devlopment work for Xen

> On Oct 23, 2013, at 12:05 AM, Daniel Kiper <daniel.kiper@...cle.com> wrote:
> 
>> On Tue, Oct 22, 2013 at 10:54:44AM +0200, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>> On 21.10.2013 23:16, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>> Mail is big, I think I got your essential points but I didn't read it whole.
>>>> On 21.10.2013 14:57, Daniel Kiper wrote:
>>>> Hi,
>>>> 
>>>> During work on multiboot2 protocol support for Xen it was discovered
>>>> that memory map passed via relevant tag could not represent wide range
>>>> of memory types available on EFI platforms. Additionally, GRUB2
>>>> implementation calls ExitBootServices() on them just before jumping
>>>> into loaded image. In this situation loaded system could not clearly
>>>> identify reserved memory regions, EFI runtime services regions and others.
>>> Will a multiboot2 tag with whole EFI memory map solve your problem?
>> I added such a tag in documentation and wrote a patch for it (attached).
> 
> Thanks. Could you send me a pointer to current multiboot2 protocol docs?
> 
>> Awaiting for someone to test it to commit
> 
> On first sight it looks quite nice. However, as I know Solaris guys
> prepared similar solution. I am not sure it was discussed with GRUB2
> guys. However, I think that it is worth coordinating both works and
> do not break existing solution if it is possible.
> 
> I will try to get more details about Solaris implementation.

  It's compatible.  Vladimir based this change on the changes we made; we just need to test to verify.

  --S

> 
> Daniel
> 
> _______________________________________________
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> Grub-devel@....org
> https://lists.gnu.org/mailman/listinfo/grub-devel
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