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

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

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
> 
> 
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> http://lists.xensource.com/xen-devel
> 
> 


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