xen discuss - Jan 2008 - s10 HVM 64-bit boot

Hi --

I wanted to boot s10 HVM in 64-bit mode but it always boots in 32-bit 
mode. Is there a special grub entry to boot s10 HVM domU in 64-bit mode? 
  Or is it HVM loader?

The grub entry is like this

title Solaris 10 5/08 s10x_u5wos_01 X86
kernel /platform/i86pc/multiboot
module /platform/i86pc/boot_archive

s10.py file is as follows :-

import os, re
arch = os.uname()[4]
if re.search(''64'', arch):
     arch_libdir = ''lib64''
else:
     arch_libdir = ''lib''

kernel = "/usr/lib/xen/boot/hvmloader"
builder=''hvm''
memory = 2048
shadow_memory = 8
name = "S10U5HVM"
vcpus=1
vif = [ ''bridge=nge1, ip=10.5.63.98'' ]
disk = [ ''file:/xVM/s10/mydisk.raw,hdc,w'']
on_poweroff = ''destroy''
on_reboot   = ''destroy''
on_crash    = ''preserve''
device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
boot=''cd''
sdl=0
vnc=1
vnclisten="0.0.0.0"
vncconsole=1
vncpasswd=''abc''
nographic=0
stdvga=0
serial=''null''


And also the performance is not great when I boot s10 with more than one 
VCPU. Any recent fixes which went in dom0 or hypervisor? I''m using 
snv_80 build for dom0.

# xm info
xen_major              : 3
xen_minor              : 0
xen_extra              : .4-1-xvm


Thanks,
--
/Saurabh
http://blogs.sun.com/saurabh_mishra

Hi Saurabh,

I think Xen 3.0.4 (which is what is in Solaris now) only runs 32bit HVM 
guests. I think this is being worked on for the next integration

Chris

Saurabh Misra wrote:
> Hi --
>
> I wanted to boot s10 HVM in 64-bit mode but it always boots in 32-bit 
> mode. Is there a special grub entry to boot s10 HVM domU in 64-bit mode? 
>   Or is it HVM loader?
>
> The grub entry is like this
>
> title Solaris 10 5/08 s10x_u5wos_01 X86
> kernel /platform/i86pc/multiboot
> module /platform/i86pc/boot_archive
>
> s10.py file is as follows :-
>
> import os, re
> arch = os.uname()[4]
> if re.search(''64'', arch):
>      arch_libdir = ''lib64''
> else:
>      arch_libdir = ''lib''
>
> kernel = "/usr/lib/xen/boot/hvmloader"
> builder=''hvm''
> memory = 2048
> shadow_memory = 8
> name = "S10U5HVM"
> vcpus=1
> vif = [ ''bridge=nge1, ip=10.5.63.98'' ]
> disk = [ ''file:/xVM/s10/mydisk.raw,hdc,w'']
> on_poweroff = ''destroy''
> on_reboot   = ''destroy''
> on_crash    = ''preserve''
> device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
> boot=''cd''
> sdl=0
> vnc=1
> vnclisten="0.0.0.0"
> vncconsole=1
> vncpasswd=''abc''
> nographic=0
> stdvga=0
> serial=''null''
>
>
> And also the performance is not great when I boot s10 with more than one 
> VCPU. Any recent fixes which went in dom0 or hypervisor? I''m using
> snv_80 build for dom0.
>
> # xm info
> xen_major              : 3
> xen_minor              : 0
> xen_extra              : .4-1-xvm
>
>
> Thanks,
> --
> /Saurabh
> http://blogs.sun.com/saurabh_mishra
> _______________________________________________
> xen-discuss mailing list
> xen-discuss@opensolaris.org
>

> I wanted to boot s10 HVM in 64-bit mode but it always boots in 32-bit 
> mode. Is there a special grub entry to boot s10 HVM domU in 64-bit mode? 
Yes, under xvm 3.0.4 the cpuid flags aren''t reported 100% the same
as on metal, and the small difference is enough that the boot code
decides that the HVM domU environment isn''t capable of 64-bit mode
(which is wrong), and falls back to 32-bit mode. 

See bug 6471548, which is similar:

    http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6471548

As a workaround try to add the 64-bit kernel path into the grub
boot entry, I think the following should work

   kernel /platform/i86pc/multiboot kernel/amd64/unix


See also:

    http://www.opensolaris.org/jive/thread.jspa?messageID=182632#182177
    http://www.opensolaris.org/jive/thread.jspa?messageID=141307#141602


And IIRC, the hang when doing BIOS calls from 64-bit HVM has been fixed
in a recent opensolaris release:

    http://www.opensolaris.org/jive/thread.jspa?messageID=141307#142380
 
 
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