Re: [Xen-users] how to boot a para-virtulized vm from cdrom afterinstallation

["Jun Hu" <duanshuidao@xxxxxxxxxxx>]

You can try this:
1. Hard way. Set up a new, completely new, HVM DomU. Attach your former PV 
DomU to it and boot form CD.
-No,  the hvm domu can't boot  the pv's   xen flavor kernel .

2. Depends on what you need to achieve over your DomU, it almost certainly 
possible to be done from Dom0.
-almost agree with you ,but there is a scene:

when  I need to do some rescue  for the boot disk  using cdrom .

-----原始邮件----- 
From: jun hu
Sent: Tuesday, October 09, 2012 4:48 AM
To: Alexandre Kouznetsov
Cc: xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] how to boot a para-virtulized vm from cdrom 
afterinstallation
thanks a lot
I see you now

from hujun's iphone

在 2012-10-9，0:11，"Alexandre Kouznetsov" <alk@xxxxxxxxxx> 写道：

> Hello.
>
> El 06/10/12 08:38, jun hu escribió:
> > how to boot a para-virtulized vm from cdrom after installation?
> In short, it does not work that way.
>
> When you decide "where to boot from", it implies there is some piece of 
> code (BIOS, for example) that will look for a bootloader on some device. 
> This is perfectly valid in HVM mode of operation, but not in PV.
> In case of Para-Virtualized DomU, the hypervisor itself loads the kernel, 
> specified in the config file. There is no BIOS or bootloader residing in 
> the MBR of a block device. There is no no such thing as "boot device" or 
> "boot order".
> You can try this:
> 1. Hard way. Set up a new, completely new, HVM DomU. Attach your former PV 
> DomU to it and boot form CD.
> 2. Depends on what you need to achieve over your DomU, it almost certainly 
> possible to be done from Dom0.
> Greetings.
>
> --
> Alexandre Kouznetsov
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users
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