Re: [Xen-devel] Minix as an HVM guest crashes

["Jonathan M. McCune" <jonmccune@xxxxxxx>]

During boot, Minix prints "Executing in 32-bit protected mode."

-Jon


Petersson, Mats wrote:

> Jon, 
>
> Is Minix a 16-bit or 32-bit OS? If it's 16-bit, it's most likely the
> cause of problems. There are a lot of places in Xen where it's assumed
> that the base of a segment is zero unless in real-mode... 
>
> Just a thought... 
>
> --
> Mats
>
>  
>
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> > Petersson, Mats
> > Sent: 16 May 2006 21:35
> > To: Jonathan M. McCune; xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: RE: [Xen-devel] Minix as an HVM guest crashes
> >
> >
> >
> >    
> >
> > > -----Original Message-----
> > > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> > > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> > >      
> > Jonathan 
> >    
> >
> > > M. McCune
> > > Sent: 16 May 2006 21:09
> > > To: xen-devel@xxxxxxxxxxxxxxxxxxx
> > > Subject: [Xen-devel] Minix as an HVM guest crashes
> > >
> > > Hello Xen community,
> > >
> > > I have tried to boot Minix 3.1.2 as an HVM guest on Xen 3.0.2 on a 
> > > system with AMD SVM extensions, but it crashes.  I have 
> > >      
> > successfully 
> >    
> >
> > > booted Linux and Windows XP as HVM guests on this system.  I have 
> > > included here the output of `xm dmesg` after attempting to boot the 
> > > Minix domain.  Here is my minix.xm file:
> > > kernel = "/usr/lib/xen/boot/hvmloader"
> > > builder='hvm'
> > > memory = 512
> > > name = "Minix"
> > > disk = [ 'file:/minix/disk.img,ioemu:hda,w' ] vif = [ 'type=ioemu, 
> > > bridge=xenbr0' ] device_model = '/usr/lib/xen/bin/qemu-dm'
> > > memmap = '/usr/lib/xen/boot/mem-map.sxp'
> > > cdrom='/minix/IDE-3.1.2.iso'
> > > boot='d'
> > > sdl=1
> > > vnc=0
> > >
> > >
> > > The command I executed in dom0 to boot the minix.xm domain 
> > > was `xm create -f minix.xm`.  The HVM guest window opens, and 
> > > minix boots to the point where it asks whether I want to 
> > > configure for "Large" or "Small" 
> > > memory.  Regardless of my choice, the HVM guest window 
> > > "blinks out of existence" shortly thereafter, and 
> > > automatically restarts itself once, before crashing again in 
> > > exactly the same way.  I chose Large both times.  This 
> > > auto-restart behavior is why there are two guests in the `xm 
> > > dmesg` output below:
> > > Does anybody know why it crashes?  Is this a Minix bug? Xen bug?  
> > > Admittedly, I haven't tried the latest xen-unstable yet, so 
> > > perhaps the issue is already solved.
> > > Thanks,
> > > -Jon
> > >
> > >
> > >      
> > This is a typical dump of a unimplemented opcode in hvm/platform.c. 
> >
> > I'm not quite sure which opcode it's trying to execute, but I'm sure
> > this is why it's failing. I'm also confused as to the base address of
> > the instruction, because the 31A7 instruction is a "add $10, %esp",
> > which shouldn't be page-faulting. One possibility is that the base of
> > the CS register isn't zero, in which case the dump of the instruction
> > bytes is bogus... 
> >
> > I doubt that the Latest Xen will fix anything.
> >
> > --
> > Mats
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >
> >    
>  
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