Re: [Xen-devel] [OSSTEST Nested PATCH 2/6] Add and expose some testsupport APIs

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Mar 23, 2015 at 04:20:08PM +0000, Pang, LongtaoX wrote:
> > 
> > > > > The editconfig_cd thing -- yet another thing which Ian questioned
> > > > > and which it was agreed you would change but you haven't.
> > > > >
> > > > For this question, I have sent a mail about it.(2015-03-04) After
> > > > finishing L1 guest VM installation, we need to change L1 guest boot
> > > > sequence from ISO image to hard disk, we need modify the "boot=cd" ,
> > >
> > > Do you? As Ian asked before, why is guest_editconfig_nocd  not
> > > sufficient? It removes the CD from the virtual drive, meaning that
> > > "boot=dc" will fail to boot from d and fallthru to c.
> > >
> > > >  also need to enable 'nestedhvm' feature in hvm configure file,
> > >
> > > This certainly doesn't belong in a function called
> > > guest_editconfig_cd, since it has nothing to do with cds at all.
> > >
> > > Anyway, it's not clear why you need to edit this into the nestedhvm
> > > configuration, instead of adding it when the configuration is created
> > > via more_prepareguest_hvm. What harm is there in enabling this during
> > > guest install?
> > >
> > I will try it.
> > 
> Re-use 'guest_ediconfig_nocd', after finishing L1 installation, it could boot 
> into L1 OS, but failed to install packages( such as lvm2, rsync, bridge-utils 
> ....) via Debian repo in L1, as below msg:
> root@nested:~# apt-get install lvm2 --no-install-recommends -y
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> The following extra packages will be installed:
>   libdevmapper-event1.02.1 libreadline5
> The following NEW packages will be installed:
>   libdevmapper-event1.02.1 libreadline5 lvm2
> 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
> Need to get 0 B/767 kB of archives.
> After this operation, 1,521 kB of additional disk space will be used.
> Media change: please insert the disc labeled
>  'Debian GNU/Linux 7.6.0 _Wheezy_ - Official amd64 DVD Binary-1 
> 20140712-14:11'
> in the drive '/media/cdrom/' and press enter
> 
> I checked the 'sources.list' file in L1, because L1 Debian OS assume that ISO 
> Image as repo, but the ISO image does not exist actually.
> Since '$gho->{Rimage}' is replaced as ' $emptyiso' in ' 
> guest_ediconfig_nocd', maybe it is not sufficient for nested test.
> If keep to re-use ' guest_ediconfig_nocd' , is there any approach to setting 
> guest's repo in osstest system? 
> 
> 

Here are my 2 cents. Might be an alternative solution to your problem.

The reason that we call guest_editconfig_nocd is to prevent the guest
from booting from CDROM again.

You can probably invent a function like guest_editconfig_boot_from_hd
(name subject to improvement) to switch "boot=dc" (which is the default
value in more_prepareguest_hvm) to "boot=cd".

That way you can boot from hard drive while at the same time keep the
CDROM filled.

Wei.

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