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

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

Hello,

        The way with the simulated linux partition exists till now only in
my head :-)
        But IMHO could be only used in the case windows is installed on
second physical disk, not only on some partition on the same physical disk.
        I never did it directly by myself, but, if, for example linux is
installed on /dev/sda and windows on /dev/sdb on some partition /dev/sdbx,
then I think, You can create a file, install or dd Your boot directory with
Grub there, possibly copy or initialize somehow the first 512 bytes of the
file with the MBR and then You could have just file image with the grub and
boot possibility, where You can select boot into windows (or other system
installed on some other disk). I think it should be possible, it is very
similar to create a boot floppy with grub installed on it. 
        I did not have time to try it itself, in the end I gave it up - I
did not have some computer, where windows would been installed on the second
physical disk...
        The configuration in SXP could then look like 

disk = [ 'file:/some_dir/grub_boot_image.img,hda,r', 'phy:/dev/sdb,hdb,w' ]

        With best regards

                Artur

-----Original Message-----
From: Brady Chen [mailto:chenchp@xxxxxxxxx] 
Sent: Wednesday, August 08, 2007 5:16 AM
To: Artur Linhart - Linux communication
Cc: tygrawy@xxxxxxxxx; Z24; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] boot a existing windows in hvm domain

yup, I think you are right, windows maybe try to scan all the
partitions on the disk.
but it's worth to have a try. however, I'm still stuck by the windows
boot issue, will let you know if it works.

and any configuration examples about how to use a dummy file to
simulate the linux partition, and let windows in xen will see the
grub, and the windows partition?

thanks

On 8/8/07, Artur Linhart - Linux communication <AL.LINUX@xxxxxxxxxxx> wrote:
> Hello,
>
>         It is a question if there is something like "careful access" if we
> speak about Windows... :-) I think Windows OS will just want to get
> exclusive access independently on the fact how careful You will be...
>
>         Good luck ;-)
>
>                 Archie
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Brady Chen
> Sent: Tuesday, August 07, 2007 12:36 PM
> To: Artur Linhart - Linux communication
> Cc: tygrawy@xxxxxxxxx; Z24; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] boot a existing windows in hvm domain
>
> I understand,
> if use the windows partition carefully, and not modify the partition
> which linux located in.
> I think it should be ok. Just don't have another disk to install
> windows separately :)
>
> On 8/7/07, Artur Linhart - Linux communication <AL.LINUX@xxxxxxxxxxx>
wrote:
> >
> > 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/
> > > >
> > >
> >
> > __________ Informace od NOD32 2440 (20070806) __________
> >
> > Tato zprava byla proverena antivirovym systemem NOD32.
> > http://www.nod32.cz
> >
> >
> >
>
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>
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