Re: [Xen-devel] question about xc_get_pfn_list()

[tgh <tianguanhua@xxxxxxxxxx>]

Thank you for your  guide 
and now I find the related code
I have read  this part code  of xen3.0.2  a few days ago,but did not 
understand it well
and I read this part code in xen3.0.3 this time ,and there are some 
change in this part
I am confused by the difference between my memory and the code,and thank 
you for your guide
I look through it

Thank you for help


Daniel Stodden åé:
> On Fri, 2007-03-16 at 11:46 +0800, tgh wrote:
>   
> > hi
> > I try to understand the code of VMcreate
> >     
> not sure what VMcreate means. are you looking at the xend code?
>
>   
> > where does the xc_get_pfn_list( ) further go to? I am confused
> > does xc_get_pfn_list finally go to the function arch_do_domctl() or not?
> > I am lost in the xc_get_pfn_list()
> >     
> huh? unless you're not looking at x86_32/64, it's carrying quite a
> blatant call to do_domct() right in the middle :). [tools/libxc/xc_private.c]
>
> this goes to arch_do_domctl() in xen, with cmd DOMCTL_getmemlist.
>
>   
> > and  the function of xc_get_pfn_list()  is  to  allocate the phymemframe 
> > to the VM which is going to be booted up ,am I right?
> >     
> no. it receives the machine frame numbers (mfns) of all 
> the pages allocated by the domain. as an array, which in turn may span 
> several pages, depending on the vm size. 
>
> the number of pages needed to carry the entire mfn list 
> can be determined from xc_domain_getinfo().
>   
> > I am  confused  about it
> >     
> no need to despair. get yourself a good utility for browsing code and
> following the function definitions. it will get better, quickly. :)
>
> regards,
> daniel
>
>   

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