Re: [PATCH] Documentation/kvm : Add documentation on Hypercalls

[Raghavendra K T]

On 06/04/2012 09:30 AM, Rob Landley wrote:
> On 05/31/2012 12:46 PM, H. Peter Anvin wrote:
> > On 05/31/2012 01:01 AM, Raghavendra K T wrote:
> > > +
> > > +TODO:
> > > +1. more information on input and output needed?
> > > +2. Add more detail to purpose of hypercalls.
> >
> > 1. definitely, including the hypercall ABI.
> >
> > 	-hpa
>
> I was wondering about that. It looks like
> Documentation/virtual/kvm/api.txt might cover some of that already in
> section 5, but it doesn't look complete...
>
> Also, could I get a 00-INDEX file for this directory explaining what
> these individual files are? I think "api.txt" is supposed to be
> host-side API for controlling a guest VM (from userspace via ioctls,
> looks like),

api.txt has  plenty of information apart from  features which are 
related to guest side api (generally  controls / knows PV features 
available, that may also involve host query of guest cpuid).
and capability (of) related to host.

 and hypercalls.txt is guest-side API for poking the host.

hypercall can be used to take some actions (as needed by guest / 
exchange information)


> How someone would write host-side code that _responds_ to a hypercall, I
> have no idea.  (It goes in the host kernel?)
>
> Rob

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