How to build a 64 bit xen

How to build a 64 bit xen

[lei yang]

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Hi experts,'

I build xen on my 64 bit redhat with "make xen", I got the image
xen-4.0.0.gz
then
$gunzip xen-4.0.0.gz
$file xen-4.0.0
it tells me it's 32 bit,but I saw it link the 64 bit lib

Thanks
Lei
-- 
"We learn from failure, not from success!"

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Re: How to build a 64 bit xen

[lei yang]

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Is there some body to help see your "$file xen-4.0.0" if your xen is 64 bit

Thanks
Lei

On Tue, May 18, 2010 at 9:11 PM, lei yang <yanglei.fage@gmail.com> wrote:

>
> Hi experts,'
>
> I build xen on my 64 bit redhat with "make xen", I got the image
> xen-4.0.0.gz
> then
> $gunzip xen-4.0.0.gz
> $file xen-4.0.0
> it tells me it's 32 bit,but I saw it link the 64 bit lib
>
> Thanks
> Lei
> --
> "We learn from failure, not from success!"
>



-- 
"We learn from failure, not from success!"

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Re: Re: How to build a 64 bit xen

[George Dunlap]

I've cross-compiled 64-bit xen exclusively since I've worked for
XenSource basically.  Here's what I get:

$ file xen/xen
xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
statically linked, stripped
$ file xen/xen-syms
xen/xen-syms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
statically linked, not stripped

So I think 'file' is just making a mistake.

 -George

On Tue, May 18, 2010 at 9:40 AM, lei yang <yanglei.fage@gmail.com> wrote:
> Is there some body to help see your "$file xen-4.0.0" if your xen is 64 bit
>
> Thanks
> Lei
>
> On Tue, May 18, 2010 at 9:11 PM, lei yang <yanglei.fage@gmail.com> wrote:
>>
>> Hi experts,'
>>
>> I build xen on my 64 bit redhat with "make xen", I got the image
>> xen-4.0.0.gz
>> then
>> $gunzip xen-4.0.0.gz
>> $file xen-4.0.0
>> it tells me it's 32 bit,but I saw it link the 64 bit lib
>>
>> Thanks
>> Lei
>> --
>> "We learn from failure, not from success!"
>
>
>
> --
> "We learn from failure, not from success!"
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
>

Re: Re: How to build a 64 bit xen

[Ian Campbell]

On Tue, 2010-05-18 at 16:13 +0100, George Dunlap wrote:
> I've cross-compiled 64-bit xen exclusively since I've worked for
> XenSource basically.  Here's what I get:
> 
> $ file xen/xen
> xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
> statically linked, stripped
> $ file xen/xen-syms
> xen/xen-syms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
> statically linked, not stripped
> 
> So I think 'file' is just making a mistake.

The 64 bit hypervisor really is encapsulated in a 32 bit container, see
the mkelf32 related rules in xen/arch/x86/Makefile.

I'm not sure why. Something to do with 32 bit bootloaders maybe?

Ian

Re: [Xen-devel] Re: How to build a 64 bit xen

[Keir Fraser]

On 18/05/2010 16:20, "Ian Campbell" <Ian.Campbell@citrix.com> wrote:

>> So I think 'file' is just making a mistake.
> 
> The 64 bit hypervisor really is encapsulated in a 32 bit container, see
> the mkelf32 related rules in xen/arch/x86/Makefile.
> 
> I'm not sure why. Something to do with 32 bit bootloaders maybe?

Multiboot spec only allows for booting 32-bit images.

 -- Keir

Re: [Xen-devel] Re: How to build a 64 bit xen

[lei yang]

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It's bad luck for me not to boot with the 64 bit xen( which see its' 32 bit
with "file")
my bootloader is gpxe.and don't see any output log, just see the target
reboot

32 bit xen works well

Lei




On Tue, May 18, 2010 at 11:20 PM, Ian Campbell <Ian.Campbell@citrix.com>wrote:

> On Tue, 2010-05-18 at 16:13 +0100, George Dunlap wrote:
> > I've cross-compiled 64-bit xen exclusively since I've worked for
> > XenSource basically.  Here's what I get:
> >
> > $ file xen/xen
> > xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
> > statically linked, stripped
> > $ file xen/xen-syms
> > xen/xen-syms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
> > statically linked, not stripped
> >
> > So I think 'file' is just making a mistake.
>
> The 64 bit hypervisor really is encapsulated in a 32 bit container, see
> the mkelf32 related rules in xen/arch/x86/Makefile.
>
> I'm not sure why. Something to do with 32 bit bootloaders maybe?
>
> Ian
>
>


-- 
"We learn from failure, not from success!"

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Re: [Xen-devel] Re: How to build a 64 bit xen

[Tim Deegan]

At 16:20 +0100 on 18 May (1274199615), Ian Campbell wrote:
> On Tue, 2010-05-18 at 16:13 +0100, George Dunlap wrote:
> > I've cross-compiled 64-bit xen exclusively since I've worked for
> > XenSource basically.  Here's what I get:
> > 
> > $ file xen/xen
> > xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
> > statically linked, stripped
> > $ file xen/xen-syms
> > xen/xen-syms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
> > statically linked, not stripped
> > 
> > So I think 'file' is just making a mistake.
> 
> The 64 bit hypervisor really is encapsulated in a 32 bit container, see
> the mkelf32 related rules in xen/arch/x86/Makefile.
> 
> I'm not sure why. Something to do with 32 bit bootloaders maybe?

Yep.  The Multiboot standard specifies that the kernel should be started
in 32-bit protected mode with flat 4GB segments.  Xen bootstraps itself
from there up into 64-bit mode.

Tim.

-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, XenServer Engineering
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

RE: Re: [Xen-devel] Re: How to build a 64 bit xen

[Mike Viau]

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Yup, it was my understanding that the (ELF 32-bit LSB executable) xen hypervisor handed off control to a 64-bit hyper-visor.

This 32-bits step was required for the boot loader (e.g.: grub) to hand over control.

 

-M


> Date: Tue, 18 May 2010 10:13:22 -0500
> From: dunlapg@umich.edu
> To: yanglei.fage@gmail.com
> CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> Subject: [Xen-users] Re: [Xen-devel] Re: How to build a 64 bit xen
> 
> I've cross-compiled 64-bit xen exclusively since I've worked for
> XenSource basically.  Here's what I get:
> 
> $ file xen/xen
> xen/xen: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
> statically linked, stripped
> $ file xen/xen-syms
> xen/xen-syms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
> statically linked, not stripped
> 
> So I think 'file' is just making a mistake.
> 
>  -George
> 
> On Tue, May 18, 2010 at 9:40 AM, lei yang <yanglei.fage@gmail.com> wrote:
> > Is there some body to help see your "$file xen-4.0.0" if your xen is 64 bit
> >
> > Thanks
> > Lei
> >
> > On Tue, May 18, 2010 at 9:11 PM, lei yang <yanglei.fage@gmail.com> wrote:
> >>
> >> Hi experts,'
> >>
> >> I build xen on my 64 bit redhat with "make xen", I got the image
> >> xen-4.0.0.gz
> >> then
> >> $gunzip xen-4.0.0.gz
> >> $file xen-4.0.0
> >> it tells me it's 32 bit,but I saw it link the 64 bit lib
> >>
> >> Thanks
> >> Lei
> >> --
> >> "We learn from failure, not from success!"
> >
> >
> >
> > --
> > "We learn from failure, not from success!"
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
> >
> >
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
 		 	   		  
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