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

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Message-ID: <4FCC700F.8020609@linux.vnet.ibm.com>
Date:	Mon, 04 Jun 2012 13:51:35 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Rob Landley <rob@...dley.net>
CC:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Alexander Graf <agraf@...e.de>, KVM <kvm@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH] Documentation/kvm : Add documentation on Hypercalls

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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