Re: [Xen-devel] question about the guestOS boot

[tgh <tianguanhua@xxxxxxxxxx>]

Thank you for your reply and guide
I try to understand how does the xen provide a virtual platform for 
guestOS to run
dom0 provides hardware abstract struct as well as software struct for 
guestOS
and when dom0 boots a vm ,it does prepare the vm vcpu_guest_context for 
guestOS to run
so when VM starts ( the same as our PC resets) ,its vcpu isnot an empty 
context like the regular ones without virtualization ,so it doesnot 
start from the regular point or function or firmware
then I do not know where does the guestOS start with in the code
could you told me where or which function does the guestOS start with ?

Thanks in advance




Petersson, Mats åé:
>  
>
>   
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of tgh
> > Sent: 09 March 2007 08:17
> > To: xen-devel
> > Subject: [Xen-devel] question about the guestOS boot
> >
> > hi
> > I try to understand the code about vm create
> > and now I am confused about which code does the guestOS start 
> > with to run ?
> > xen domain0 uses the function xc_domain_creat() and 
> > xc_linux_build() to
> > prepare the necessary struct such as vcpu_guest_context and 
> > other things
> > for vm guestOS to bootup , in the xc_linux_build(),the initrd is also
> > loaded in,is it right?
> > then guestOS does not run the regular bootloader ,is it right?
> >     
> That is correct. 
>   
> > then I am confused about which function or which lines of the 
> > code does
> > the guestOS start with ?
> >     
> Can you explain your confusion a bit more - I'm not entirely sure what
> you're asking, and it's very hard to answer questions when you don't
> know the actual question. 
>
> Also, it's much better if you explain a little bit about what you're
> trying to achieve (I've previously used the example of someone having a
> puncture, going to ask the mechanic how to loosen a wheel-nut, then
> going to ask how to jack up the car, then asking how to tighten the
> wheel-nut, when the actual problem is a punctured tyre, and the "right"
> question to ask a mechanic is "How do I replace my punctured tyre with
> the spare wheel?"). 
>
> Asking the overall question you're trying to solve will give you a more
> complete answer to what you're trying to do, rather than a detailed
> answer on the point where you're at (and that may actually not help your
> overall problem at all). 
>
> --
> Mats
>   
> > could you help me
> >
> > Thanks in advance
> >
> >
> > _______________________________________________
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> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >
> >
> >     
>
>
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>
>
>   

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