linux-kernel - RE: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding control

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Date:	Fri, 3 Jul 2015 02:19:46 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	Eric Auger <eric.auger@...aro.org>,
	"eric.auger@...com" <eric.auger@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"avi.kivity@...il.com" <avi.kivity@...il.com>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"b.reynal@...tualopensystems.com" <b.reynal@...tualopensystems.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"Wu, Feng" <feng.wu@...el.com>
Subject: RE: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding
 control



> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@...hat.com]
> Sent: Thursday, July 02, 2015 9:41 PM
> To: Eric Auger; eric.auger@...com; linux-arm-kernel@...ts.infradead.org;
> kvmarm@...ts.cs.columbia.edu; kvm@...r.kernel.org;
> christoffer.dall@...aro.org; marc.zyngier@....com;
> alex.williamson@...hat.com; avi.kivity@...il.com; mtosatti@...hat.com;
> Wu, Feng; joro@...tes.org; b.reynal@...tualopensystems.com
> Cc: linux-kernel@...r.kernel.org; patches@...aro.org
> Subject: Re: [RFC 12/17] irq: bypass: Extend skeleton for ARM forwarding
> control
> 
> 
> 
> On 02/07/2015 15:17, Eric Auger wrote:
> > - new fields are added on producer side: linux irq, vfio_device handle,
> >   active which reflects whether the source is active (at interrupt
> >   controller level or at VFIO level - automasked -) and finally an
> >   opaque pointer which will be used to point to the vfio_platform_device
> >   in this series.
> 
> Linux IRQ and active should be okay.  As to the vfio_device handle, you
> should link it from the vfio_platform_device instead.  And for the
> vfio_platform_device, you can link it from the vfio_platform_irq instead.
> 
> Once you've done this, embed the irq_bypass_producer struct in the
> vfio_platform_irq struct; in the new kvm_arch_* functions, go back to
> the vfio_platform_irq struct via container_of.  From there you can
> retrieve pointers to the vfio_platform_device and the vfio_device.
> 
> > - new fields on consumer side: the kvm handle, the gsi
> 
> You do not need to add these.  Instead, add the kvm handle to irqfd
> only.  Like above, embed the irq_bypass_consumer struct in the irqfd
> struct; in the new kvm_arch_* functions, go back to the
> vfio_platform_irq struct via container_of.
> 

I also need the gsi field here, for posted-interrupts, I need 'gsi', 'irq' to
update the IRTE.

Thanks,
Feng


> Paolo
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