linux-kernel - RE: [v3 21/26] x86, irq: Define a global vector for VT-d Posted-Interrupts

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Date:	Mon, 2 Feb 2015 01:06:11 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"gleb@...nel.org" <gleb@...nel.org>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>
CC:	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v3 21/26] x86, irq: Define a global vector for VT-d
 Posted-Interrupts



> -----Original Message-----
> From: H. Peter Anvin [mailto:hpa@...or.com]
> Sent: Saturday, January 31, 2015 2:19 AM
> To: Wu, Feng; tglx@...utronix.de; mingo@...hat.com; x86@...nel.org;
> gleb@...nel.org; pbonzini@...hat.com; dwmw2@...radead.org;
> joro@...tes.org; alex.williamson@...hat.com; jiang.liu@...ux.intel.com
> Cc: eric.auger@...aro.org; linux-kernel@...r.kernel.org;
> iommu@...ts.linux-foundation.org; kvm@...r.kernel.org
> Subject: Re: [v3 21/26] x86, irq: Define a global vector for VT-d
> Posted-Interrupts
> 
> On 12/12/2014 07:14 AM, Feng Wu wrote:
> > Currently, we use a global vector as the Posted-Interrupts
> > Notification Event for all the vCPUs in the system. We need
> > to introduce another global vector for VT-d Posted-Interrtups,
> > which will be used to wakeup the sleep vCPU when an external
> > interrupt from a direct-assigned device happens for that vCPU.
> >
> > Signed-off-by: Feng Wu <feng.wu@...el.com>
> >
> 
> >  #ifdef CONFIG_HAVE_KVM
> > +void (*wakeup_handler_callback)(void) = NULL;
> > +EXPORT_SYMBOL_GPL(wakeup_handler_callback);
> > +
> 
> Stylistic nitpick: we generally don't explicitly initialize
> global/static pointer variables to NULL (that happens automatically anyway.)
> 
> Other than that,
> 
> Acked-by: H. Peter Anvin <hpa@...ux.intel.com>

Thanks a lot for your review, Peter!

Thanks,
Feng