Re: [PATCH v9 00/18] Add VT-d Posted-Interrupts support - including prerequisite series
From: Alex Williamson
Date: Fri Sep 18 2015 - 13:58:06 EST
On Fri, 2015-09-18 at 16:58 +0200, Paolo Bonzini wrote:
>
> On 18/09/2015 16:29, 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-technology/vt-directed-io-spec.html
>
> Thanks. I will squash patches 2 and 14 together, and drop patch 3.
>
> Signed-off-bys are missing in patch 1 and 4. The patches exist
> elsewhere in the mailing list archives, so not a big deal. Or just
> reply to them with the S-o-b line.
>
> Alex, can you ack the series and review patch 12?
I sent an ack for 12 separately, I got a bit lost in 16 & 17, but for
all the others that don't already have some tag from me,
Reviewed-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
>
> Joerg, can you ack patch 18?
>
> Paolo
>
> > v9:
> > - Include the whole series:
> > [01/18]: irq bypasser manager
> > [02/18] - [06/18]: Common non-architecture part for VT-d PI and ARM side forwarded irq
> > [07/18] - [18/18]: VT-d PI part
> >
> > v8:
> > refer to the changelog in each patch
> >
> > v7:
> > * Define two weak irq bypass callbacks:
> > - kvm_arch_irq_bypass_start()
> > - kvm_arch_irq_bypass_stop()
> > * Remove the x86 dummy implementation of the above two functions.
> > * Print some useful information instead of WARN_ON() when the
> > irq bypass consumer unregistration fails.
> > * Fix an issue when calling pi_pre_block and pi_post_block.
> >
> > v6:
> > * Rebase on 4.2.0-rc6
> > * Rebase on https://lkml.org/lkml/2015/8/6/526 and http://www.gossamer-threads.com/lists/linux/kernel/2235623
> > * Make the add_consumer and del_consumer callbacks static
> > * Remove pointless INIT_LIST_HEAD to 'vdev->ctx[vector].producer.node)'
> > * Use dev_info instead of WARN_ON() when irq_bypass_register_producer fails
> > * Remove optional dummy callbacks for irq producer
> >
> > v4:
> > * For lowest-priority interrupt, only support single-CPU destination
> > interrupts at the current stage, more common lowest priority support
> > will be added later.
> > * Accoring to Marcelo's suggestion, when vCPU is blocked, we handle
> > the posted-interrupts in the HLT emulation path.
> > * Some small changes (coding style, typo, add some code comments)
> >
> > v3:
> > * Adjust the Posted-interrupts Descriptor updating logic when vCPU is
> > preempted or blocked.
> > * KVM_DEV_VFIO_DEVICE_POSTING_IRQ --> KVM_DEV_VFIO_DEVICE_POST_IRQ
> > * __KVM_HAVE_ARCH_KVM_VFIO_POSTING --> __KVM_HAVE_ARCH_KVM_VFIO_POST
> > * Add KVM_DEV_VFIO_DEVICE_UNPOST_IRQ attribute for VFIO irq, which
> > can be used to change back to remapping mode.
> > * Fix typo
> >
> > v2:
> > * Use VFIO framework to enable this feature, the VFIO part of this series is
> > base on Eric's patch "[PATCH v3 0/8] KVM-VFIO IRQ forward control"
> > * Rebase this patchset on git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git,
> > then revise some irq logic based on the new hierarchy irqdomain patches provided
> > by Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> >
> >
> > *** BLURB HERE ***
> >
> > Alex Williamson (1):
> > virt: IRQ bypass manager
> >
> > Eric Auger (4):
> > KVM: arm/arm64: select IRQ_BYPASS_MANAGER
> > KVM: create kvm_irqfd.h
> > KVM: introduce kvm_arch functions for IRQ bypass
> > KVM: eventfd: add irq bypass consumer management
> >
> > Feng Wu (13):
> > KVM: x86: select IRQ_BYPASS_MANAGER
> > 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: Make struct kvm_irq_routing_table accessible
> > KVM: make kvm_set_msi_irq() public
> > vfio: Register/unregister irq_bypass_producer
> > KVM: x86: Update IRTE for posted-interrupts
> > KVM: Implement IRQ bypass consumer callbacks for x86
> > 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
> > iommu/vt-d: Add a command line parameter for VT-d posted-interrupts
> >
> > Documentation/kernel-parameters.txt | 1 +
> > Documentation/virtual/kvm/locking.txt | 12 ++
> > MAINTAINERS | 7 +
> > arch/arm/kvm/Kconfig | 2 +
> > arch/arm/kvm/Makefile | 1 +
> > arch/arm64/kvm/Kconfig | 2 +
> > arch/arm64/kvm/Makefile | 1 +
> > arch/x86/include/asm/kvm_host.h | 24 +++
> > arch/x86/kvm/Kconfig | 3 +
> > arch/x86/kvm/Makefile | 3 +
> > arch/x86/kvm/irq_comm.c | 32 ++-
> > arch/x86/kvm/lapic.c | 59 ++++++
> > arch/x86/kvm/lapic.h | 2 +
> > arch/x86/kvm/trace.h | 33 ++++
> > arch/x86/kvm/vmx.c | 361 +++++++++++++++++++++++++++++++++-
> > arch/x86/kvm/x86.c | 108 +++++++++-
> > drivers/iommu/irq_remapping.c | 12 +-
> > drivers/vfio/pci/Kconfig | 1 +
> > drivers/vfio/pci/vfio_pci_intrs.c | 9 +
> > drivers/vfio/pci/vfio_pci_private.h | 2 +
> > include/linux/irqbypass.h | 90 +++++++++
> > include/linux/kvm_host.h | 29 +++
> > include/linux/kvm_irqfd.h | 71 +++++++
> > virt/kvm/Kconfig | 3 +
> > virt/kvm/eventfd.c | 142 +++++++------
> > virt/kvm/irqchip.c | 10 -
> > virt/kvm/kvm_main.c | 3 +
> > virt/lib/Kconfig | 2 +
> > virt/lib/Makefile | 1 +
> > virt/lib/irqbypass.c | 257 ++++++++++++++++++++++++
> > 30 files changed, 1182 insertions(+), 101 deletions(-)
> > create mode 100644 include/linux/irqbypass.h
> > create mode 100644 include/linux/kvm_irqfd.h
> > create mode 100644 virt/lib/Kconfig
> > create mode 100644 virt/lib/Makefile
> > create mode 100644 virt/lib/irqbypass.c
> >
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