Date:   Wed, 13 Jan 2021 16:37:35 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        "eric.auger.pro@...il.com" <eric.auger.pro@...il.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "will@...nel.org" <will@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "maz@...nel.org" <maz@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>
Cc:     "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
        "zhangfei.gao@...il.com" <zhangfei.gao@...il.com>,
        "vivek.gautam@....com" <vivek.gautam@....com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "yi.l.liu@...el.com" <yi.l.liu@...el.com>,
        "tn@...ihalf.com" <tn@...ihalf.com>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        yuzenghui <yuzenghui@...wei.com>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        "linuxarm@...neuler.org" <linuxarm@...neuler.org>
Subject: Re: [PATCH v13 00/15] SMMUv3 Nested Stage Setup (IOMMU part)

Hi Shameer,

On 1/8/21 6:05 PM, Shameerali Kolothum Thodi wrote:
> Hi Eric,
> 
>> -----Original Message-----
>> From: Eric Auger [mailto:eric.auger@...hat.com]
>> Sent: 18 November 2020 11:22
>> To: eric.auger.pro@...il.com; eric.auger@...hat.com;
>> iommu@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
>> kvm@...r.kernel.org; kvmarm@...ts.cs.columbia.edu; will@...nel.org;
>> joro@...tes.org; maz@...nel.org; robin.murphy@....com;
>> alex.williamson@...hat.com
>> Cc: jean-philippe@...aro.org; zhangfei.gao@...aro.org;
>> zhangfei.gao@...il.com; vivek.gautam@....com; Shameerali Kolothum
>> Thodi <shameerali.kolothum.thodi@...wei.com>;
>> jacob.jun.pan@...ux.intel.com; yi.l.liu@...el.com; tn@...ihalf.com;
>> nicoleotsuka@...il.com; yuzenghui <yuzenghui@...wei.com>
>> Subject: [PATCH v13 00/15] SMMUv3 Nested Stage Setup (IOMMU part)
>>
>> This series brings the IOMMU part of HW nested paging support
>> in the SMMUv3. The VFIO part is submitted separately.
>>
>> The IOMMU API is extended to support 2 new API functionalities:
>> 1) pass the guest stage 1 configuration
>> 2) pass stage 1 MSI bindings
>>
>> Then those capabilities gets implemented in the SMMUv3 driver.
>>
>> The virtualizer passes information through the VFIO user API
>> which cascades them to the iommu subsystem. This allows the guest
>> to own stage 1 tables and context descriptors (so-called PASID
>> table) while the host owns stage 2 tables and main configuration
>> structures (STE).
> 
> I am seeing an issue with Guest testpmd run with this series.
> I have two different setups and testpmd works fine with the
> first one but not with the second.
> 
> 1). Guest doesn't have kernel driver built-in for pass-through dev.
> 
> root@...ntu:/# lspci -v
> ...
> 00:02.0 Ethernet controller: Huawei Technologies Co., Ltd. Device a22e (rev 21)
> Subsystem: Huawei Technologies Co., Ltd. Device 0000
> Flags: fast devsel
> Memory at 8000100000 (64-bit, prefetchable) [disabled] [size=64K]
> Memory at 8000000000 (64-bit, prefetchable) [disabled] [size=1M]
> Capabilities: [40] Express Root Complex Integrated Endpoint, MSI 00
> Capabilities: [a0] MSI-X: Enable- Count=67 Masked-
> Capabilities: [b0] Power Management version 3
> Capabilities: [100] Access Control Services
> Capabilities: [300] Transaction Processing Hints
> 
> root@...ntu:/# echo vfio-pci > /sys/bus/pci/devices/0000:00:02.0/driver_override
> root@...ntu:/# echo 0000:00:02.0 > /sys/bus/pci/drivers_probe
> 
> root@...ntu:/mnt/dpdk/build/app# ./testpmd -w 0000:00:02.0 --file-prefix socket0  -l 0-1 -n 2 -- -i
> EAL: Detected 8 lcore(s)
> EAL: Detected 1 NUMA nodes
> EAL: Multi-process socket /var/run/dpdk/socket0/mp_socket
> EAL: Selected IOVA mode 'VA'
> EAL: No available hugepages reported in hugepages-32768kB
> EAL: No available hugepages reported in hugepages-64kB
> EAL: No available hugepages reported in hugepages-1048576kB
> EAL: Probing VFIO support...
> EAL: VFIO support initialized
> EAL:   Invalid NUMA socket, default to 0
> EAL:   using IOMMU type 1 (Type 1)
> EAL: Probe PCI driver: net_hns3_vf (19e5:a22e) device: 0000:00:02.0 (socket 0)
> EAL: No legacy callbacks, legacy socket not created
> Interactive-mode selected
> testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=155456, size=2176, socket=0
> testpmd: preferred mempool ops selected: ring_mp_mc
> 
> Warning! port-topology=paired and odd forward ports number, the last port will pair with itself.
> 
> Configuring Port 0 (socket 0)
> Port 0: 8E:A6:8C:43:43:45
> Checking link statuses...
> Done
> testpmd>
> 
> 2). Guest have kernel driver built-in for pass-through dev.
> 
> root@...ntu:/# lspci -v
> ...
> 00:02.0 Ethernet controller: Huawei Technologies Co., Ltd. Device a22e (rev 21)
> Subsystem: Huawei Technologies Co., Ltd. Device 0000
> Flags: bus master, fast devsel, latency 0
> Memory at 8000100000 (64-bit, prefetchable) [size=64K]
> Memory at 8000000000 (64-bit, prefetchable) [size=1M]
> Capabilities: [40] Express Root Complex Integrated Endpoint, MSI 00
> Capabilities: [a0] MSI-X: Enable+ Count=67 Masked-
> Capabilities: [b0] Power Management version 3
> Capabilities: [100] Access Control Services
> Capabilities: [300] Transaction Processing Hints
> Kernel driver in use: hns3
> 
> root@...ntu:/# echo vfio-pci > /sys/bus/pci/devices/0000:00:02.0/driver_override
> root@...ntu:/# echo 0000:00:02.0 > /sys/bus/pci/drivers/hns3/unbind
> root@...ntu:/# echo 0000:00:02.0 > /sys/bus/pci/drivers_probe
> 
> root@...ntu:/mnt/dpdk/build/app# ./testpmd -w 0000:00:02.0 --file-prefix socket0 -l 0-1 -n 2 -- -i
> EAL: Detected 8 lcore(s)
> EAL: Detected 1 NUMA nodes
> EAL: Multi-process socket /var/run/dpdk/socket0/mp_socket
> EAL: Selected IOVA mode 'VA'
> EAL: No available hugepages reported in hugepages-32768kB
> EAL: No available hugepages reported in hugepages-64kB
> EAL: No available hugepages reported in hugepages-1048576kB
> EAL: Probing VFIO support...
> EAL: VFIO support initialized
> EAL:   Invalid NUMA socket, default to 0
> EAL:   using IOMMU type 1 (Type 1)
> EAL: Probe PCI driver: net_hns3_vf (19e5:a22e) device: 0000:00:02.0 (socket 0)
> 0000:00:02.0 hns3_get_mbx_resp(): VF could not get mbx(11,0) head(1) tail(0) lost(1) from PF in_irq:0
> hns3vf_get_queue_info(): Failed to get tqp info from PF: -62
> hns3vf_init_vf(): Failed to fetch configuration: -62
> hns3vf_dev_init(): Failed to init vf: -62
> EAL: Releasing pci mapped resource for 0000:00:02.0
> EAL: Calling pci_unmap_resource for 0000:00:02.0 at 0x1100800000
> EAL: Calling pci_unmap_resource for 0000:00:02.0 at 0x1100810000
> EAL: Requested device 0000:00:02.0 cannot be used
> EAL: Bus (pci) probe failed.
> EAL: No legacy callbacks, legacy socket not created
> testpmd: No probed ethernet devices
> Interactive-mode selected
> testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=155456, size=2176, socket=0
> testpmd: preferred mempool ops selected: ring_mp_mc
> Done
> testpmd>
> 
> And in this case, smmu(host) reports a translation fault,
> 
> [ 6542.670624] arm-smmu-v3 arm-smmu-v3.2.auto: event 0x10 received:
> [ 6542.670630] arm-smmu-v3 arm-smmu-v3.2.auto: 0x00007d1200000010
> [ 6542.670631] arm-smmu-v3 arm-smmu-v3.2.auto: 0x000012000000007c
> [ 6542.670633] arm-smmu-v3 arm-smmu-v3.2.auto: 0x00000000fffef040
> [ 6542.670634] arm-smmu-v3 arm-smmu-v3.2.auto: 0x00000000fffef000
> 
> Tested with Intel 82599 card(ixgbevf) as well. but same errror.
> 
> Not able to root cause the problem yet. With the hope that, this is 
> related to tlb entries not being invlaidated properly, I tried explicitly
> issuing CMD_TLBI_NSNH_ALL and CMD_CFGI_CD_ALL just before
> the STE update, but no luck yet :(
> 
> Please let me know if I am missing something here or has any clue if you
> can replicate this on your setup.

Thank for for the report. I need to setup the DPDK environment again and
I will test on my end. I plan to respin next week and study all the
issues you reported up to now. I will rebase on Jean's last branch.

Thanks

Eric
> 
> Thanks,
> Shameer
> 
>>
>> Best Regards
>>
>> Eric
>>
>> This series can be found at:
>> https://github.com/eauger/linux/tree/5.10-rc4-2stage-v13
>> (including the VFIO part in his last version: v11)
>>
>> The series includes a patch from Jean-Philippe. It is better to
>> review the original patch:
>> [PATCH v8 2/9] iommu/arm-smmu-v3: Maintain a SID->device structure
>>
>> The VFIO series is sent separately.
>>
>> History:
>>
>> v12 -> v13:
>> - fixed compilation issue with CONFIG_ARM_SMMU_V3_SVA
>>   reported by Shameer. This urged me to revisit patch 4 into
>>   iommu/smmuv3: Allow s1 and s2 configs to coexist where
>>   s1_cfg and s2_cfg are not dynamically allocated anymore.
>>   Instead I use a new set field in existing structs
>> - fixed 2 others config checks
>> - Updated "iommu/arm-smmu-v3: Maintain a SID->device structure"
>>   according to the last version
>>
>> v11 -> v12:
>> - rebase on top of v5.10-rc4
>>
>> Eric Auger (14):
>>   iommu: Introduce attach/detach_pasid_table API
>>   iommu: Introduce bind/unbind_guest_msi
>>   iommu/smmuv3: Allow s1 and s2 configs to coexist
>>   iommu/smmuv3: Get prepared for nested stage support
>>   iommu/smmuv3: Implement attach/detach_pasid_table
>>   iommu/smmuv3: Allow stage 1 invalidation with unmanaged ASIDs
>>   iommu/smmuv3: Implement cache_invalidate
>>   dma-iommu: Implement NESTED_MSI cookie
>>   iommu/smmuv3: Nested mode single MSI doorbell per domain enforcement
>>   iommu/smmuv3: Enforce incompatibility between nested mode and HW MSI
>>     regions
>>   iommu/smmuv3: Implement bind/unbind_guest_msi
>>   iommu/smmuv3: Report non recoverable faults
>>   iommu/smmuv3: Accept configs with more than one context descriptor
>>   iommu/smmuv3: Add PASID cache invalidation per PASID
>>
>> Jean-Philippe Brucker (1):
>>   iommu/arm-smmu-v3: Maintain a SID->device structure
>>
>>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 659
>> ++++++++++++++++++--
>>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 103 ++-
>>  drivers/iommu/dma-iommu.c                   | 142 ++++-
>>  drivers/iommu/iommu.c                       | 105 ++++
>>  include/linux/dma-iommu.h                   |  16 +
>>  include/linux/iommu.h                       |  41 ++
>>  include/uapi/linux/iommu.h                  |  54 ++
>>  7 files changed, 1042 insertions(+), 78 deletions(-)
>>
>> --
>> 2.21.3
> 

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