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    SubjectRe: [PATCH] Documentation/kvm : Add documentation on Hypercalls
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    On 02.08.2012, at 09:08, Raghavendra K T <raghavendra.kt@linux.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@linux.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@linux.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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