linux-kernel - RE: [v5 00/19] Add VT-d Posted-Interrupts support

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Date:	Tue, 14 Jul 2015 01:08:45 +0000
From:	"Wu, Feng" <feng.wu@...el.com>
To:	Eric Auger <eric.auger@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"joro@...tes.org" <joro@...tes.org>, "Wu, Feng" <feng.wu@...el.com>
Subject: RE: [v5 00/19] Add VT-d Posted-Interrupts support



> -----Original Message-----
> From: Eric Auger [mailto:eric.auger@...aro.org]
> Sent: Monday, July 13, 2015 9:19 PM
> To: Wu, Feng; kvm@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: pbonzini@...hat.com; alex.williamson@...hat.com; joro@...tes.org
> Subject: Re: [v5 00/19] Add VT-d Posted-Interrupts support
> 
> Hi Feng,
> On 07/13/2015 11:47 AM, Feng Wu wrote:
> > VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt.
> > With VT-d Posted-Interrupts enabled, external interrupts from
> > direct-assigned devices can be delivered to guests without VMM
> > intervention when guest is running in non-root mode.
> >
> > You can find the VT-d Posted-Interrtups Spec. in the following URL:
> >
> http://www.intel.com/content/www/us/en/intelligent-systems/intel-technolog
> y/vt-directed-io-spec.html
> >
> > This series was part of
> http://thread.gmane.org/gmane.linux.kernel.iommu/7708. To make things
> clear, send out IOMMU part here.
> >
> > This patch-set is based on the lastest x86/apic branch of tip tree.
> >
> > Divide the whole series which contain multiple components into three parts:
> > - Prerequisite changes to irq subsystem (already merged)
> > - IOMMU part (already merged)
> > - KVM and VFIO parts (this series)
> >
> > v5:
> > - Based on Alex and Eric's irq bypass manager:
> > https://lkml.org/lkml/2015/7/10/663
> > - Reuse some common patch from Eric
> 
> A comment about the overall structure. Previously you prefered to have 2
> separate series, one usable by both of us and one with my forwarding
> stuff. Why did you change your mind?

I didn't change my mind, since alex sent out the latest irq bypass manger
patch, in which, some callbacks are renamed and some are changed to
optional, I feel there may need some changes to your patch below:
[RFC v2 0/6] IRQ bypass manager and irqfd consumer

So I integrate it here, sorry for the inconvenience. Could you please send
Out a new version of this patch-set, then I can follow it. Thanks a lot!

Thanks,
Feng

> 
> Best Regards
> 
> Eric
> >
> > Eric Auger (3):
> >   KVM: create kvm_irqfd.h
> >   KVM: eventfd: add irq bypass information in irqfd
> >   KVM: eventfd: add irq bypass consumer management
> >
> > Feng Wu (16):
> >   KVM: Extend struct pi_desc for VT-d Posted-Interrupts
> >   KVM: Add some helper functions for Posted-Interrupts
> >   KVM: Define a new interface kvm_intr_is_single_vcpu()
> >   KVM: Get Posted-Interrupts descriptor address from struct kvm_vcpu
> >   KVM: Add interfaces to control PI outside vmx
> >   KVM: Make struct kvm_irq_routing_table accessible
> >   KVM: make kvm_set_msi_irq() public
> >   vfio: Select IRQ_BYPASS_MANAGER for vfio PCI devices
> >   vfio: Register/unregister irq_bypass_producer
> >   KVM, x86: Select IRQ_BYPASS_MANAGER for KVM_INTEL
> >   KVM: x86: Update IRTE for posted-interrupts
> >   KVM: x86: Add arch specific routines for irqbypass manager
> >   KVM: Add an arch specific hooks in 'struct kvm_kernel_irqfd'
> >   KVM: Update Posted-Interrupts Descriptor when vCPU is preempted
> >   KVM: Update Posted-Interrupts Descriptor when vCPU is blocked
> >   KVM: Warn if 'SN' is set during posting interrupts by software
> >
> >  arch/x86/include/asm/kvm_host.h     |  15 ++
> >  arch/x86/kvm/Kconfig                |   1 +
> >  arch/x86/kvm/irq_comm.c             |  28 +++-
> >  arch/x86/kvm/vmx.c                  | 278
> +++++++++++++++++++++++++++++++++++-
> >  arch/x86/kvm/x86.c                  | 160 +++++++++++++++++++--
> >  drivers/vfio/pci/Kconfig            |   1 +
> >  drivers/vfio/pci/vfio_pci_intrs.c   |  19 +++
> >  drivers/vfio/pci/vfio_pci_private.h |   2 +
> >  include/linux/kvm_host.h            |  23 +++
> >  include/linux/kvm_irqfd.h           |  74 ++++++++++
> >  virt/kvm/eventfd.c                  | 115 ++++++---------
> >  virt/kvm/irqchip.c                  |  11 --
> >  virt/kvm/kvm_main.c                 |   3 +
> >  13 files changed, 632 insertions(+), 98 deletions(-)
> >  create mode 100644 include/linux/kvm_irqfd.h
> >

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