Re: [PATCH v9 00/18] Add VT-d Posted-Interrupts support - including prerequisite series

[Paolo Bonzini]

On 18/09/2015 17:08, Wu, Feng wrote:
> 
> 
>> -----Original Message-----
>> From: Paolo Bonzini [mailto:pbonzini@xxxxxxxxxx]
>> Sent: Friday, September 18, 2015 10:59 PM
>> To: Wu, Feng; alex.williamson@xxxxxxxxxx; joro@xxxxxxxxxx;
>> mtosatti@xxxxxxxxxx
>> Cc: eric.auger@xxxxxxxxxx; kvm@xxxxxxxxxxxxxxx;
>> iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>> Subject: Re: [PATCH v9 00/18] Add VT-d Posted-Interrupts support - including
>> prerequisite series
>>
>>
>>
>> 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-technolog
>> y/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.
>>
> 
> Thanks for your quick response, Paolo! I didn't change the code
> in patch 1 and 4, do I need to add s-o-b, if needed, I can reply
> the patches.

Yes, the s-o-b just means that the code passed through your hands.

Note that I replied to patch 17, but no need to resend that one
either---just mailing list discussion is enough.

Paolo

> Thanks,
> Feng
> 
>> Alex, can you ack the series and review patch 12?
>>
>> 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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