linux-kernel - RE: [tip:x86/hyperv] X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts

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Message-ID: <e637e3e4bb724e32a64b13ba746d65a6@SN2PR03MB061.namprd03.prod.outlook.com>
Date:	Wed, 13 Feb 2013 12:47:14 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: RE: [tip:x86/hyperv] X86: Handle Hyper-V vmbus interrupts as
 special hypervisor interrupts



> -----Original Message-----
> From: yhlu.kernel@...il.com [mailto:yhlu.kernel@...il.com] On Behalf Of
> Yinghai Lu
> Sent: Tuesday, February 12, 2013 11:43 PM
> To: KY Srinivasan
> Cc: H. Peter Anvin; mingo@...nel.org; linux-kernel@...r.kernel.org;
> tglx@...utronix.de; hpa@...ux.intel.com; linux-tip-commits@...r.kernel.org
> Subject: Re: [tip:x86/hyperv] X86: Handle Hyper-V vmbus interrupts as special
> hypervisor interrupts
> 
> On Tue, Feb 12, 2013 at 7:58 PM, KY Srinivasan <kys@...rosoft.com> wrote:
> >
> >
> >> -----Original Message-----
> >> From: H. Peter Anvin [mailto:hpa@...or.com]
> >> Sent: Tuesday, February 12, 2013 10:55 PM
> >> To: KY Srinivasan
> >> Cc: Yinghai Lu; mingo@...nel.org; linux-kernel@...r.kernel.org;
> >> tglx@...utronix.de; hpa@...ux.intel.com; linux-tip-commits@...r.kernel.org
> >> Subject: Re: [tip:x86/hyperv] X86: Handle Hyper-V vmbus interrupts as special
> >> hypervisor interrupts
> >>
> >> On 02/12/2013 07:49 PM, KY Srinivasan wrote:
> >> >>>
> >> >>> The issue was that you could turn on CONFIG_HYPERV without enabling
> >> >>> CONFIG_X86_LOCAL_APIC. Peter fixed it.
> >> >>>
> >> >>
> >> >> He is asking why you are using IS_ENABLED() instead of #ifdef.  The
> >> >> difference is that IS_ENABLED() works even for modules.
> >> >
> >> > My mistake!
> >> >
> >>
> >> Well, which one do you need?
> >
> > I chose the IS_ENABLED() because I wanted to cover the case where HYPERV is
> configured as a module as well.
> >
> 
> ok, so when HYPERV is built as module, actually it is partially module
> as it put some code built-in already?
> if user never load hyperv, those code will never not be used.
> 
> Can those code not be put in module _init function?

Some code in mshyperv.c is built into the kernel. Registering an IDT entry is dependent on HYPERV drivers being configured - either as modules or built-in.

K. Y
> 
> Thanks
> 
> Yinghai
> 


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