linux-kernel - Re: Could anybody give some description about the implement of hyercall in kvm?

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Date:	Fri, 13 Jan 2012 15:45:06 +0800
From:	Liu ping fan <kernelfans@...il.com>
To:	Stefan Hajnoczi <stefanha@...il.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Could anybody give some description about the implement of
 hyercall in kvm?

On Thu, Jan 12, 2012 at 5:21 PM, Stefan Hajnoczi <stefanha@...il.com> wrote:
> On Thu, Jan 12, 2012 at 4:38 AM, Liu ping fan <kernelfans@...il.com> wrote:
>> Could anybody give some description about the implement of hyercall in
>> kvm? Or give some links about it?
>
> Try git grep hypercall arch/x86/kvm.
>
> Take a look at arch/x86/kvm/x86.c kvm_set_msr_common() and
> kvm_emulate_hypercall().  Some of the KVM time-keeping, minimal HyperV
> support, and async page faults live there.  Also see
> arch/x86/include/asm/kvm_para.h.
>
> Hypercalls are architecture-specific so if you are interested in ppc
> or s390, check those arch directories.
>
Thanks, but when I tried to start from the macro "____PVOP_VCALL", but
lost in it. If there is some document like the hypercall in Xen, this
will be appreciated. (And I guest Hypercall in kvm is the same as Xen
which is very similar to syscall, right?)

Thanks
ping fan

> Stefan
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