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Re: [Libguestfs] [PATCH] v2v: virtio-win: include *.dll too



On Thu, Oct 29, 2015 at 10:33:57AM +0200, Yan Vugenfirer wrote:
> > On 29 Oct 2015, at 10:28, Richard W.M. Jones <rjones redhat com> wrote:
> > On Thu, Oct 29, 2015 at 11:05:42AM +1100, Vadim Rozenfeld wrote:
> > 
> > Seems like looking at this field in the .inf file is better than our
> > current approach of matching path names.
> 
> You just need to remember that we have binary compatible versions of
> drivers. For example virtio-net driver for Windows 2012 (Windows 8)
> (6.2) will be used for Windows 2012R2 (Windows 8.1) and Windows Server
> 2016 (Windows 10). So you are getting the lowest compatible version of
> the OS from INF file. 

That seems to match Vadim's description:

> >> If you found an inf file with the matching minor OS (6 in our case)
> >> version and matching or less but close minor version number (2 vs 3)
> >> then you are in the right directory.

and it's OK as it's an algorithm that can be coded and made to work
reliably.

However, do I get it right that this is just a convention currently
followed in virtio-win drivers?  I.e. there's nothing in the Windows
driver specifications mandating this versioning scheme?  I'm trying to
figure out how dependable it is.

Besides, ATM there's at least one driver -- qemupciserial -- which
doesn't fit in this scheme (or any scheme at all :).

There are other peculiarities which we don't know what to do:

- the netkvm driver directory on virtio-win.iso contains netkvmco.dll
  (I'm assuming it's coinstaller dll).  However, netkvm.inf doesn't
  mention it, and the driver installs just fine without it.

- the balloon driver directory on virtio-win.iso contains blnsvr.exe
  (and .pdb) which is apparently a usermode service to report memory
  stats to host via balloon virtio queue.  However nothing seems to
  automatically trigger installation of that service.

Thanks,
Roman.


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