linux-kernel - RE: [v4 3/3] x86, irq: Define a global vector for VT-d Posted-Interrupts

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Date:	Mon, 18 May 2015 02:44:53 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v4 3/3] x86, irq: Define a global vector for VT-d
 Posted-Interrupts



> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Friday, May 15, 2015 9:27 PM
> To: Wu, Feng
> Cc: mingo@...hat.com; hpa@...or.com; linux-kernel@...r.kernel.org;
> jiang.liu@...ux.intel.com
> Subject: Re: [v4 3/3] x86, irq: Define a global vector for VT-d Posted-Interrupts
> 
> On Thu, 30 Apr 2015, Feng Wu wrote:
> >  #ifdef CONFIG_HAVE_KVM
> > +void (*wakeup_handler_callback)(void);
> > +EXPORT_SYMBOL_GPL(wakeup_handler_callback);
> 
> The matching entry in a header file is going to come later again?

I will add the declaration in a header file in this patch.

> 
> >  /*
> >   * Handler for POSTED_INTERRUPT_VECTOR.
> >   */
> > @@ -256,6 +259,30 @@ __visible void smp_kvm_posted_intr_ipi(struct
> pt_regs *regs)
> >
> >  	set_irq_regs(old_regs);
> >  }
> > +
> > +/*
> > + * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR.
> > + */
> > +__visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
> > +{
> > +	struct pt_regs *old_regs = set_irq_regs(regs);
> > +
> > +	ack_APIC_irq();
> > +
> > +	irq_enter();
> > +
> > +	exit_idle();
> 
>   entering_ack_irq() please

Good idea!

Thanks,
Feng

> 
> > +	inc_irq_stat(kvm_posted_intr_wakeup_ipis);
> > +
> > +	if (wakeup_handler_callback)
> > +		wakeup_handler_callback();
> > +
> > +	irq_exit();
> > +
> > +	set_irq_regs(old_regs);
> > +}
> 
> Thanks,
> 
> 	tglx
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