Re: [Xen-devel] [PATCH RFC 09/14] xen: vmx: Introduce a Hyper call to set subpage

[Yi Zhang <yi.z.zhang@xxxxxxxxxxxxxxx>]

On 2017-10-19 at 12:34:07 -0600, Tamas K Lengyel wrote:
> On Thu, Oct 19, 2017 at 2:13 AM, Zhang Yi <yi.z.zhang@xxxxxxxxxxxxxxx> wrote:
> > From: Zhang Yi Z <yi.z.zhang@xxxxxxxxxxxxxxx>
> >
> > The Hypercall is defined as HVMOP_set_subpage
> 
> Are there any expected use-cases where a HVM guest would need access
> to this hypercall? Is spp compatible with #VE? If not, I think it
> would be better to integrate this with the existing xen_mem_access_op.

That a good point Tamas, I'm considering to use this hypercall from a
HVM guest, then it would be simple and useful if a HVM guest can control
it by itself, there already somebody are investigating on it. So let us
wait a while for this hypercall.

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