linux-kernel - RE: [RFC v2 0/6] IRQ bypass manager and irqfd consumer

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Date:	Fri, 24 Jul 2015 01:27:29 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	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>,
	"pbonzini@...hat.com" <pbonzini@...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 v2 0/6] IRQ bypass manager and irqfd consumer



> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org
> [mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Eric Auger
> Sent: Monday, July 06, 2015 8:11 PM
> To: eric.auger@...com; eric.auger@...aro.org;
> 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; pbonzini@...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: [RFC v2 0/6] IRQ bypass manager and irqfd consumer
> 
> This series introduces and extends the IRQ bypass manager written
> by Alex and transforms irqfd into an IRQ bypass manager consumer.
> The producer part, in my case the VFIO platform driver will be introduced
> separately. That code should be usable by both ARM IRQ forwarding
> and Intel Posted Interrupts.
> 
> The IRQ bypass manager enables to setup a negotiated link between an
> IRQ producer and an IRQ consumer (typically the VFIO driver and KVM irqfd).
> 
> The series currently includes Alex's code which was sent my email.
> Its structure obvioulsy will adapt to Alex's will.
> 
> Also the irq bypass manager gets compiled/linked on arm/arm64 along
> with KVM and VFIO platform driver.
> 
> can be found at:
> https://git.linaro.org/people/eric.auger/linux.git/shortlog/refs/heads/v4.2-rc1-
> bypass-fwd-v2
> 
> Best Regards
> 
> Eric
> 
> History:
> v1 -> v2:
> - isolate the bypass manager and irqfd consumer in this series
> - take into account Paolo's comments and use container_of strategy and
>   remove additional fields introduced in v1.
> - create kvm_irqfd.h
> - add unregistration in irqfd_shutdown

Hi Eric,

[4/6], [5/6], and [6/6] of this series are common to forwarded irq and posted
interrupts, did you have a chance to get a new version of them based on
Alex's latest irqbypass manager patch:

https://lkml.org/lkml/2015/7/16/810

Thanks a lot!

Thanks,
Feng

> 
> v1: originally part of [RFC 00/17] ARM IRQ forward control based on IRQ
>     bypass manager (https://lkml.org/lkml/2015/7/2/268)
> 
> 
> Eric Auger (6):
>   KVM: arm/arm64: select IRQ_BYPASS_MANAGER
>   VFIO: platform: select IRQ_BYPASS_MANAGER
>   irq: bypass: Extend skeleton for ARM forwarding control
>   KVM: create kvm_irqfd.h
>   KVM: introduce kvm_arch functions for IRQ bypass
>   KVM: eventfd: add irq bypass consumer management
> 
>  arch/arm/kvm/Kconfig          |   1 +
>  arch/arm64/kvm/Kconfig        |   1 +
>  drivers/vfio/platform/Kconfig |   1 +
>  include/linux/irqbypass.h     |  19 ++++++--
>  include/linux/kvm_host.h      |  37 ++++++++++++++
>  include/linux/kvm_irqfd.h     |  70 +++++++++++++++++++++++++++
>  kernel/irq/bypass.c           |  44 +++++++++++++++--
>  virt/kvm/Kconfig              |   3 ++
>  virt/kvm/eventfd.c            | 109 +++++++++++++-----------------------------
>  9 files changed, 203 insertions(+), 82 deletions(-)
>  create mode 100644 include/linux/kvm_irqfd.h
> 
> --
> 1.9.1
> 
> --
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