RE: [Xen-users] boot a existing windows in hvm domain

["Artur Linhart - Linux communication" <AL.LINUX@xxxxxxxxxxx>]

Hello, 

        Yes, I communicated to this thread also. Exactly the same
configuration I have on my notebook... 
        My opinion is, either the boot into windows as Domu, nor the boot
into Linux as a DomU (re-enter) is possible, or, if possible, then very
unsafe - but I did not get working even the re-entrance of linux.
        I understand it so, if there is no underlaying mechanism like nfs
allowing the synchronization of the write-accesses, the device where DomU is
installed (it does not matter if it is a real physical device or virtual
disk emulated through file or logical volume) must give to windows or other
Domu operating system the possibility to control exclusively the
write-access to this device (disk). Even the domain installed on logical
volume will not start if the logical volume is mounted in Dom0 as
read/write...
        And even if nfs is used, I think it is not a good idea run the
system twice a time at the same time from the same physical location - I can
imagine some services will not be started, because there are some locks
already from the other system instance, data on teh disk can get confused or
destroyed by the parallel access, etc....
        So, from my point of view, it cannot work and even if it would be
from some unclear reason possible it is not intended and not safe to do it
so, like described below.

        With best regards, Archie.

-----Original Message-----
From: Brady Chen [mailto:chenchp@xxxxxxxxx] 
Sent: Tuesday, August 07, 2007 4:55 AM
To: Z24; AL.LINUX@xxxxxxxxxxx; tygrawy@xxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] boot a existing windows in hvm domain

Hi Z24, AL,
ccing tygrawy@gazeta,pl, for I found he got the same issue.

I tried in ThinkPad T60,
/dev/sda1 -- windows
/dev/sda2 -- Linux + Xen 3.1.0

in xen guest, the whole sda is mapped to virtual hda.
disk = [ 'phy:/dev/sda, hda, w' ]

I could see the grub menu in xen guest, and could boot in to the linux
(you know, it's re-enter into the linux), but when I select windows
from grub menu, it will hang after print "chainloader +1"
the xen dmesg shows:
(XEN) HVM1: Trap (0x6) while in real mode
(XEN) HVM1: eax         D00 ecx           0 edx         71F ebx         71E
(XEN) HVM1: esp       D7384 ebp       D73D0 esi       D7364 edi         D00
(XEN) HVM1: trapno        6 errno         0
(XEN) HVM1: eip       D0800 cs           10 eflags    13046
(XEN) HVM1: uesp      D7474 uss           2
(XEN) HVM1: ves       D4AB8 vds       D4C1D vfs       D07FE vgs       D7474
(XEN) HVM1: cr0       50032 cr2           0 cr3           0 cr4         651
(XEN) HVM1:
(XEN) HVM1: Halt called from %eip 0xD037

tygrawy:
I found you have the same issue months ago, have you find out the
reason? Thank you very much.

http://lists.xensource.com/archives/html/xen-users/2007-07/msg00521.html

On 8/2/07, Brady Chen <chenchp@xxxxxxxxx> wrote:
> On 8/2/07, Z24 <z24@xxxxxxx> wrote:
> > On Thu, 2 Aug 2007 17:47:59 +0800, you wrote:
> >
> > >thank you all,
> > >looks like it's possible. it's great!
> > >
> > >Z24,
> > >do you get the hardware issue Archie said, that's my concern too.
> > >you know, windows may be bluescreen if the hardware changes.
> >
> > Before booting the Windows domU I copied the current Windows HW
> > Profile to a new HW Profile, then when I boot the domU I choose the
> > new HW profile.
> > The first time I booted the domU, Windows took some minutes more than
> > usual to load, I suppose it was setting automatically the hardware
> > drivers; the next time it booted only a little slower than when I boot
> > it natively (due to virtualization).
> >
> thanks, I will have a try.
>
> > >and for your case, i think you could install another grub in the
windows disk
> >
> > What do you mean?
> > Xen VM configuration with 'phy:/dev/hda,ioemu:hda,w' only (hda is
> > Windows disk) and grub-install on /dev/hda without mapping?
> yup, install grub on /dev/hda, it will not be used when you not using
> xen (i mean when you reboot your PC, and choose windows from the grub
> menu). but when you use xen to boot /dev/hda, the grub on /dev/hda
> could be used to load the windows. Don't know if it really works,
> don't have a try now.
> >
> > --
> > Z24
> > http://www.mycomputingart.com/
> >
>

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