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

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Date:	Thu, 2 Aug 2012 12:13:00 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Rob Landley <rob@...dley.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>, KVM <kvm@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.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 02.08.2012, at 09:08, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:

> On 08/01/2012 11:55 PM, Marcelo Tosatti wrote:
>> On Wed, Aug 01, 2012 at 04:19:01PM +0530, Raghavendra K T wrote:
>>> On 08/01/2012 08:37 AM, Marcelo Tosatti wrote:
>>>> On Tue, Jul 24, 2012 at 02:23:59PM +0530, Raghavendra K T wrote:
>>>>> From: Raghavendra K T<raghavendra.kt@...ux.vnet.ibm.com>
>>>>> 
>>>>> Thanks Alex for KVM_HC_FEATURES inputs and Jan for VAPIC_POLL_IRQ,
>>>>> and Peter (HPA) for suggesting hypercall ABI addition.
>>>>> 
>>>>> Signed-off-by: Raghavendra K T<raghavendra.kt@...ux.vnet.ibm.com>
>>>>> ---
> [...]
>>>>> +
>>>>> + Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
>>>>> + The hypercall number should be placed in rax and the return value will be
>>>>> + placed in rax.  No other registers will be clobbered unless explicitly stated
>>>>> + by the particular hypercall.
>>>> 
>>>> It depends on the hypercall. It happens that current hypercalls use
>>>> the four registers, but its not an ABI (hyper-v hypercalls uses r8, for example).
>>>> 
>>> 
>>> Okay, agree. I did not know about hyper-v. Above one is for X86 and
>>> KVM  (and not X86 / hyper-v). So I should remove ABI and probably say,
>> 
>> Just say "Linux x86 Hypercall", yeah.
>> 
> 
> Ok, Thanks Marcelo.will respin patches with the changes you suggested.
> 
> Also I would  like add Alex's description on ppc hypercalls
> into Documentation/virtual/kvm/ppc-pv.txt with Alex from/sob or
> suggested-by in a separate patch unless I see any objection to that.
> 

Yeah, don't stall this on me :)

Alex--
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