Re: [Xen-devel] [PATCH for-next RFC 0/8] Port Xen to Hyper-V

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Sep 25, 2019 at 04:36:34PM +0100, Wei Liu wrote:
> On Wed, Sep 25, 2019 at 01:02:50PM +0200, Roger Pau Monné wrote:
> > On Mon, Sep 23, 2019 at 11:09:23AM +0100, Wei Liu wrote:
> > > Hi all
> > > 
> > > In case you're wondering, I can already run a fully fledged Xen system on
> > > Hyper-V with emulated disk and network.
> > > 
> > > This is the very first stage for porting Xen to run on Hyper-V with all 
> > > the
> > > goodies Hyper-V has to offer.  With this series, Xen can successfully 
> > > detect
> > > Hyper-V and prints out a message.  I would like to first get the directory
> > > structure and kconfig options agreed upon.
> > > 
> > > There are two major areas to be worked on:
> > >   * Make Dom0 able to use Hyper-V's synthetic devices.
> > >   * Make Xen use of the synthetic timer, reference TSC and enlightenment 
> > > VMCS
> > >     and other interfaces.
> > > 
> > > They aren't trivial, and time can be scarce on my side, so I intend to 
> > > post
> > > patches piece meal when they are ready.
> > > 
> > > Questions and comments are welcome.
> > 
> > Thanks for doing this!
> > 
> > In the past I've played with trying to get Xen to boot as a guest on
> > HyperV gen2 instances, and I did manage to get it booting, Linux
> > however would get extremely confused because gen2 lacks emulated
> > devices and instead the guest is forced to use the HyperV PV devices
> > AFAIK.
> 
> How did you force Linux to use Hyper-V PV devices? 

I didn't, that's where I stopped. I just managed to get Xen
booting on gen2, but Linux dom0 won't boot due to what you pointed out
below.

Roger.

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