Re: [Xen-devel] Proxying Hyper-V hypercalls from L2 to L0

[Wei Liu <wl@xxxxxxx>]

On Mon, 30 Dec 2019 at 16:24, Wei Liu <wl@xxxxxxx> wrote:
>
> Hi all
>
> As much as I try to avoid writing code to proxy Hyper-V hypercalls, it
> seems unavoidable for PV guests, because Hyper-V requires hypercalls
> to be issued with CPL=0.
>
> This means for PV Dom0 I will need to add code in Xen to support
> Hyper-V's ABIs, along with appropriate validations.
>
> How much do you care about running a PV Dom0 in this Xen on Hyper-V
> setup? I personally would certainly go full on PVH if possible. :-)
>

I tested PVH Dom0 in Xen on Hyper-V setup just now. Unfortunately
Hyper-V doesn't support vIOMMU yet. Dom0 didn't get any interrupt in
that setup.

I guess like it or not in the short term I will have to make PV Dom0 work.

Wei.


> Thanks,
> Wei.

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