linux-kernel - RE: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an interrupt to a VCPU

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Date:	Thu, 14 May 2015 01:04:33 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an
 interrupt to a VCPU



> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Thursday, May 14, 2015 5:04 AM
> To: Jiang Liu
> Cc: Wu, Feng; mingo@...hat.com; hpa@...or.com;
> linux-kernel@...r.kernel.org
> Subject: Re: [v4 1/3] genirq: Introduce irq_set_vcpu_affinity() to target an
> interrupt to a VCPU
> 
> 
> On Wed, 13 May 2015, Jiang Liu wrote:
> 
> > On 2015/4/30 15:06, Feng Wu wrote:
> > > With Posted-Interrupts support in Intel CPU and IOMMU, an external
> > > interrupt from assigned-devices could be directly delivered to a
> > > virtual CPU in a virtual machine. Instead of hacking KVM and Intel
> > > IOMMU drivers, we propose a platform independent interface to target
> > > an interrupt to a specific virtual CPU in a virtual machine, or set
> > > virtual CPU affinity for an interrupt.
> > >
> > > By adopting this new interface and the hierarchy irqdomain, we could
> > > easily support posted-interrupts on Intel platforms, and also provide
> > > flexible enough interfaces for other platforms to support similar
> > > features.
> > >
> > > Here is the usage scenario for this interface:
> > > Guest update MSI/MSI-X interrupt configuration
> > >         -->QEMU and KVM handle this
> > >         -->KVM call this interface (passing posted interrupts descriptor
> > >            and guest vector)
> > >         -->irq core will transfer the control to IOMMU
> > >         -->IOMMU will do the real work of updating IRTE (IRTE has new
> > >            format for VT-d Posted-Interrupts)
> >
> > Hi Thomas,
> > 	Any comments or suggestions about this abstraction interface?
> 
> It's on my review list...

Thanks a lot, Thomas!

Thanks,
Feng
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