[Libguestfs] [PATCH 6/7] v2v: quiet virtio net and balloon devices wizards

[Cedric Bosdonnat]

On Tue, 2016-04-05 at 17:19 +0300, Roman Kagan wrote:
> On Tue, Apr 05, 2016 at 01:47:32PM +0200, Cédric Bosdonnat wrote:
> > Setting the ConfigFlags to 0x40 for those will make windows quiet
> > at the first boot about those new devices. The wizard must not be
> > presented to the user since the needed drivers will automatically
> > be installed at firstboot... or worse, the wizard can even block
> > the installer.
> 
> What installer?

At least the VMDP installer running at firstboot is blocked by these
wizards.

> You're trying circumvent the usual PnP process people are used to. 
>  I'm
> not sure it's worth adding yet more unreliable hacks (yes, basically
> the
> whole v2v/windows_virtio.ml is a hack).

Setting those keys forces windows to ignore the virtio net and balloon
devices for the first boot time. Running the VMDP installer (or the RH
equivalent one) will install the needed drivers and all will be fine
after that.

> > ---
> >  v2v/windows_virtio.ml | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/v2v/windows_virtio.ml b/v2v/windows_virtio.ml
> > index dfb7b71..22e3e31 100644
> > --- a/v2v/windows_virtio.ml
> > +++ b/v2v/windows_virtio.ml
> > @@ -196,6 +196,14 @@ and add_viostor_to_critical_device_database g
> > root current_cs major =
> >        [ "0", REG_SZ (sprintf
> > "PCI\\VEN_1AF4&DEV_1001&SUBSYS_00021AF4&REV_00\\%s&20" subkey);
> >          "Count", REG_DWORD 0x1_l;
> >          "NextInstance", REG_DWORD 0x1_l ];
> > +
> > +      [ current_cs; "Enum"; "PCI";
> > "VEN_1AF4&DEV_1000&SUBSYS_00011AF4&REV_00"; subkey ^ "&18" ],
> > +      [ "ConfigFlags", REG_DWORD 0x40_l ];
> > +      [ current_cs; "Enum"; "PCI";
> > "VEN_1AF4&DEV_1001&SUBSYS_00021AF4&REV_00"; subkey ^ "&20" ],
> > +      [ "ConfigFlags", REG_DWORD 0x0_l;
> > +        "Service", REG_SZ driver_name ];
> > +      [ current_cs; "Enum"; "PCI";
> > "VEN_1AF4&DEV_1002&SUBSYS_00051AF4&REV_00"; subkey ^ "&28" ],
> > +      [ "ConfigFlags", REG_DWORD 0x40_l ];
> 
> I'm curious how reliable those keys are; what are the chances that
> the
> devices get assigned different instance ids?  I couldn't find any
> sources indicating that those instance ids are assigned in any
> predictable manner.

I have no idea how they are computed, but they are common accross all
windows versions except for the subkey that changes with windows
versions.

I tried to get rid of those subkeys, but then windows keeps showing the
wizards without those.

--
Cedric