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

[Wei Liu <wl@xxxxxxx>]

On Mon, Sep 23, 2019 at 10:48:45AM +0000, Paul Durrant wrote:
> > -----Original Message-----
> > From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of Wei 
> > Liu
> > Sent: 23 September 2019 11:09
> > To: Xen Development List <xen-devel@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Wei Liu <liuwe@xxxxxxxxxxxxx>; Wei Liu <wl@xxxxxxx>; Andrew Cooper 
> > <Andrew.Cooper3@xxxxxxxxxx>;
> > Michael Kelley <mikelley@xxxxxxxxxxxxx>; Jan Beulich <jbeulich@xxxxxxxx>; 
> > Roger Pau Monne
> > <roger.pau@xxxxxxxxxx>
> > Subject: [Xen-devel] [PATCH for-next RFC 0/8] Port Xen to Hyper-V
> > 
> > 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.
> 
> Yay! Glad you found the time to do this :-) Making use of the synic,
> stimer, will be useful. To get the benefit for nested guests though, I
> assume we'll need to exposed enlightened VMCS, EPT flush, etc.
> through?

Per TLFS, eVMCS should be used by L1 Xen.

Not sure what you meant by EPT flush. If you mean things like
HvFlushGuestPhysicalAddressSpace, I think they should be used by Xen
only as well. I'm not sure whether they should be expose to L2 guests.

There are hypercalls for virtual TLB management. We may choose to expose
them to L2 guests for better performance.

Wei.

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