New Kernel Versions

[Joel Rittvo]

Could someone please explain (or point me to an explanation of) the 
alternate builds released for the newest test kernel?  Specifically:

kernel compiled for Xen guest0 VM operations
kernel compiled for unprivileged Xen guest VMs

Thanks.

Joel Rittvo

[Alan Cox]

On Wed, Dec 01, 2004 at 05:50:42PM -0500, Joel Rittvo wrote:
>  Could someone please explain (or point me to an explanation of) the 
>  alternate builds released for the newest test kernel?  Specifically:
>  
>  kernel compiled for Xen guest0 VM operations
>  kernel compiled for unprivileged Xen guest VMs 
Xen is a para-virtualisation system for x86. It provides a secure way to run a
lot of copies of Linux at once on a single PC. To get the speed it doesn't 
emulate a PC exactly (as vmware tries to) but requires the kernels are
"Xen friendly". 

The Xen guest0 kernel is the kernel that runs all the real devices and supports
the actual hardware. The unpriviledged guests then talk to guest0 via 
virtual hardware interfaces.

Alan

[Satish Balay]

On Wed, 1 Dec 2004, Alan Cox wrote:

>  On Wed, Dec 01, 2004 at 05:50:42PM -0500, Joel Rittvo wrote:
>  > Could someone please explain (or point me to an explanation of) the 
>  > alternate builds released for the newest test kernel?  Specifically:
>  > 
>  > kernel compiled for Xen guest0 VM operations
>  > kernel compiled for unprivileged Xen guest VMs
>  
>  Xen is a para-virtualisation system for x86. It provides a secure way to run a
>  lot of copies of Linux at once on a single PC. To get the speed it doesn't 
>  emulate a PC exactly (as vmware tries to) but requires the kernels are
>  "Xen friendly". 
>  
>  The Xen guest0 kernel is the kernel that runs all the real devices and supports
>  the actual hardware. The unpriviledged guests then talk to guest0 via 
>  virtual hardware interfaces. 
Ok - I'm a bit confused.

Does this mean 'guest0' is equivalent to vmware-host-os (i.e I boot
off this kernel on the real hardware), and 'guestU' (unpreviledged) is
the kernel installed inside the 'vm'? (aka vmware-guest-os)

or is it something else?

Satish

[Satish Balay]

On Wed, 1 Dec 2004, Satish Balay wrote:

>  On Wed, 1 Dec 2004, Alan Cox wrote:
>  
>  > On Wed, Dec 01, 2004 at 05:50:42PM -0500, Joel Rittvo wrote:
>  > > Could someone please explain (or point me to an explanation of) the 
>  > > alternate builds released for the newest test kernel?  Specifically:
>  > > 
>  > > kernel compiled for Xen guest0 VM operations
>  > > kernel compiled for unprivileged Xen guest VMs
>  > 
>  > Xen is a para-virtualisation system for x86. It provides a secure way to run a
>  > lot of copies of Linux at once on a single PC. To get the speed it doesn't 
>  > emulate a PC exactly (as vmware tries to) but requires the kernels are
>  > "Xen friendly". 
>  > 
>  > The Xen guest0 kernel is the kernel that runs all the real devices and supports
>  > the actual hardware. The unpriviledged guests then talk to guest0 via 
>  > virtual hardware interfaces.
>  
>  Ok - I'm a bit confused.
>  
>  Does this mean 'guest0' is equivalent to vmware-host-os (i.e I boot
>  off this kernel on the real hardware), and 'guestU' (unpreviledged) is
>  the kernel installed inside the 'vm'? (aka vmware-guest-os)
>  
>  or is it something else? 
Never mind.. The following from xen user's manual explains a bit
(still need more reading). Grub entry for xen (for initial boot).

title Xen 2.0 / XenLinux 2.6.9
  kernel /boot/xen.gz dom0_mem=131072
  module /boot/vmlinuz-2.6.9-xen0 root=/dev/sda4 ro console=tty0


Satish
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http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html