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Subject: Re: [PATCH kernel v7 00/20] powerpc/powernv/npu, vfio: NVIDIA V100 +
 P9 passthrough
To:     Michael Ellerman <mpe@ellerman.id.au>,
        linuxppc-dev@lists.ozlabs.org
Cc:     David Gibson <david@gibson.dropbear.id.au>,
        kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
        Alistair Popple <alistair@popple.id.au>,
        Reza Arbab <arbab@linux.ibm.com>,
        Sam Bobroff <sbobroff@linux.ibm.com>,
        Piotr Jaroszynski <pjaroszynski@nvidia.com>,
        =?UTF-8?Q?Leonardo_Augusto_Guimar=c3=a3es_Garcia?= 
        <lagarcia@br.ibm.com>, Jose Ricardo Ziviani <joserz@linux.ibm.com>,
        Daniel Henrique Barboza <danielhb413@gmail.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Paul Mackerras <paulus@ozlabs.org>,
        linux-kernel@vger.kernel.org, Christoph Hellwig <hch@infradead.org>
References: <20181220082350.58113-1-aik@ozlabs.ru>
 <87h8f8r10z.fsf@concordia.ellerman.id.au>
From:   Alexey Kardashevskiy <aik@ozlabs.ru>
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Message-ID: <8da1b46e-1ef1-d2b5-2d2b-c633fb827c47@ozlabs.ru>
Date:   Thu, 20 Dec 2018 22:28:03 +1100
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On 20/12/2018 20:38, Michael Ellerman wrote:
> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
> 
>> My bad, I was not cc-ing everyone but now with v7 I am, sorry about that.
> 
> I've already applied v6, I'll assume this is unchanged from that unless
> you tell me otherwise.

14/20 has fixed warning about uninitialized npdev, 20/20 has fixed
comment about one capability:

[fstn1-p1 kernel]$ git diff 7e04f09 9128bd1
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c
b/arch/powerpc/platforms/powernv/npu-dma.c
index ed81426..12b8421 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -540,7 +540,7 @@ struct iommu_table_group
*pnv_try_setup_npu_table_group(struct pnv_ioda_pe *pe)
        struct npu_comp *npucomp;
        struct pci_dev *gpdev = NULL;
        struct pci_controller *hose;
-       struct pci_dev *npdev;
+       struct pci_dev *npdev = NULL;

        list_for_each_entry(gpdev, &pe->pbus->devices, bus_list) {
                npdev = pnv_pci_get_npu_dev(gpdev, 0);
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 22b825c..5562587 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -390,8 +390,7 @@ struct vfio_region_info_cap_nvlink2_ssatgt {
 };

 /*
- * Capability with compressed real address (aka SSA - small system
address),
- * used to match the NVLink bridge with a GPU. Also contains a link speed.
+ * Capability with an NVLink link speed.
  */
 #define VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD    5


> 
> cheers
> 
>> This is for passing through NVIDIA V100 GPUs on POWER9 systems.
>> 20/20 has the details of hardware setup.
>>
>> This implements support for NVIDIA V100 GPU with coherent memory and
>> NPU/ATS support available in the POWER9 CPU. The aim is to support
>> unmodified vendor driver in the guest.
>>
>> This is pushed to (both guest and host kernels):
>> https://github.com/aik/linux/tree/nv2
>>
>> Matching qemu is pushed to github:
>> https://github.com/aik/qemu/tree/nv2
>>
>> Skiboot bits are here:
>> https://github.com/aik/skiboot/tree/nv2
>>
>> The individual patches have changelogs. v7 fixes compile warning
>> and updates a VFIO capability comment in 20/20.
>>
>> Please comment. Thanks.
>>
>>
>>
>> Alexey Kardashevskiy (20):
>>   powerpc/ioda/npu: Call skiboot's hot reset hook when disabling NPU2
>>   powerpc/mm/iommu/vfio_spapr_tce: Change mm_iommu_get to reference a
>>     region
>>   powerpc/vfio/iommu/kvm: Do not pin device memory
>>   powerpc/powernv: Move npu struct from pnv_phb to pci_controller
>>   powerpc/powernv/npu: Move OPAL calls away from context manipulation
>>   powerpc/pseries/iommu: Use memory@ nodes in max RAM address
>>     calculation
>>   powerpc/pseries/npu: Enable platform support
>>   powerpc/pseries: Remove IOMMU API support for non-LPAR systems
>>   powerpc/powernv/pseries: Rework device adding to IOMMU groups
>>   powerpc/iommu_api: Move IOMMU groups setup to a single place
>>   powerpc/powernv: Reference iommu_table while it is linked to a group
>>   powerpc/powernv/npu: Move single TVE handling to NPU PE
>>   powerpc/powernv/npu: Convert NPU IOMMU helpers to
>>     iommu_table_group_ops
>>   powerpc/powernv/npu: Add compound IOMMU groups
>>   powerpc/powernv/npu: Add release_ownership hook
>>   powerpc/powernv/npu: Check mmio_atsd array bounds when populating
>>   powerpc/powernv/npu: Fault user page into the hypervisor's pagetable
>>   vfio_pci: Allow mapping extra regions
>>   vfio_pci: Allow regions to add own capabilities
>>   vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver
>>
>>  drivers/vfio/pci/Makefile                     |   1 +
>>  arch/powerpc/include/asm/iommu.h              |  17 +-
>>  arch/powerpc/include/asm/mmu_context.h        |  15 +-
>>  arch/powerpc/include/asm/pci-bridge.h         |   1 +
>>  arch/powerpc/include/asm/pci.h                |   4 +
>>  arch/powerpc/platforms/powernv/pci.h          |  30 +-
>>  drivers/vfio/pci/trace.h                      | 102 ++++
>>  drivers/vfio/pci/vfio_pci_private.h           |  20 +
>>  include/uapi/linux/vfio.h                     |  37 ++
>>  arch/powerpc/kernel/iommu.c                   |  69 +--
>>  arch/powerpc/kvm/book3s_64_vio.c              |  18 +-
>>  arch/powerpc/mm/mmu_context_iommu.c           | 110 +++-
>>  arch/powerpc/platforms/powernv/npu-dma.c      | 549 +++++++++++++++---
>>  arch/powerpc/platforms/powernv/pci-ioda-tce.c |   3 +-
>>  arch/powerpc/platforms/powernv/pci-ioda.c     | 237 ++++----
>>  arch/powerpc/platforms/powernv/pci.c          |  43 +-
>>  arch/powerpc/platforms/pseries/iommu.c        |  88 ++-
>>  arch/powerpc/platforms/pseries/pci.c          |  22 +
>>  drivers/vfio/pci/vfio_pci.c                   |  42 +-
>>  drivers/vfio/pci/vfio_pci_nvlink2.c           | 482 +++++++++++++++
>>  drivers/vfio/vfio_iommu_spapr_tce.c           |  64 +-
>>  drivers/vfio/pci/Kconfig                      |   6 +
>>  22 files changed, 1569 insertions(+), 391 deletions(-)
>>  create mode 100644 drivers/vfio/pci/trace.h
>>  create mode 100644 drivers/vfio/pci/vfio_pci_nvlink2.c
>>
>> -- 
>> 2.17.1

-- 
Alexey