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Re: [Qemu-devel] [Qemu-arm] [PATCH v4 0/5] virtio-iommu: VFIO integratio


From: Auger Eric
Subject: Re: [Qemu-devel] [Qemu-arm] [PATCH v4 0/5] virtio-iommu: VFIO integration
Date: Wed, 27 Sep 2017 10:55:07 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

Hi Linu,

On 27/09/2017 10:30, Bharat Bhushan wrote:
> Hi,
> 
>> -----Original Message-----
>> From: Linu Cherian [mailto:address@hidden
>> Sent: Wednesday, September 27, 2017 1:11 PM
>> To: Bharat Bhushan <address@hidden>
>> Cc: address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden;
>> address@hidden
>> Subject: Re: [Qemu-arm] [PATCH v4 0/5] virtio-iommu: VFIO integration
>>
>> Hi,
>>
>> On Wed Sep 27, 2017 at 12:03:15PM +0530, Bharat Bhushan wrote:
>>> This patch series integrates VFIO/VHOST with virtio-iommu.
>>>
>>> This version is mainly about rebasing on v4 version on virtio-iommu
>>> device framework from Eric Augur and addresing review comments.
>>>
>>> This patch series allows PCI pass-through using virtio-iommu.
>>>
>>> This series is based on:
>>>  - virtio-iommu kernel driver by Jean-Philippe Brucker
>>>     [1] [RFC] virtio-iommu version 0.4
>>>     git://linux-arm.org/virtio-iommu.git branch viommu/v0.4

Just to make sure, do you use the v0.4 virtio-iommu driver from above
branch?

Thanks

Eric
>>>
>>>  - virtio-iommu device emulation by Eric Augur.
>>>    [RFC v4 00/16] VIRTIO-IOMMU device
>>>    https://github.com/eauger/qemu/tree/v2.10.0-virtio-iommu-v4
>>>
>>> Changes are available at : https://github.com/bharaty/qemu.git
>>> virtio-iommu-vfio-integration-v4
>>>
>>
>> # With the above sources, was trying to test the vfio-pci device assigned to
>>   guest using Qemu.
>> # Both guest and host kernels are configured with 4k as page size.
>> # releavant qemu command snippet,
>>   -device virtio-iommu-device -device virtio-blk-device,drive=hd0 \
>>   -net none -device vfio-pci,host=xxx
>>
>>
>> On guest booting, observed mutliple messages as below,
>>
>> qemu-system-aarch64: iommu has granularity incompatible with target AS
>>
>> # On adding necessary prints, 0x5000 is len, 0x4fff is address mask
>>   and the code expects the address mask to be 0xfff.
> 
> I have not seen these errors, I am also using 4K page-size on both host and 
> guest. Can you share compete qemu command and log. 
> 
> Thanks
> -Bharat
> 
>>
>> if (len & iotlb->addr_mask) {
>>         error_report
>>
>> # vfio_dma_map is failing due to this error.
>>
>> Any pointers ?
>>
>>
>>> v3->v4:
>>>  - Rebase to v4 version from Eric
>>>  - Fixes from Eric with DPDK in VM
>>>  - Logical division in multiple patches
>>>
>>> v2->v3:
>>>  - This series is based on "[RFC v3 0/8] VIRTIO-IOMMU device"
>>>    Which is based on top of v2.10-rc0 that
>>>  - Fixed issue with two PCI devices
>>>  - Addressed review comments
>>>
>>> v1->v2:
>>>   - Added trace events
>>>   - removed vSMMU3 link in patch description
>>>
>>> Bharat Bhushan (5):
>>>   target/arm/kvm: Translate the MSI doorbell in
>> kvm_arch_fixup_msi_route
>>>   virtio-iommu: Add iommu notifier for map/unmap
>>>   virtio-iommu: Call iommu notifier for attach/detach
>>>   virtio-iommu: add iommu replay
>>>   virtio-iommu: add iommu notifier memory-region
>>>
>>>  hw/virtio/trace-events           |   5 ++
>>>  hw/virtio/virtio-iommu.c         | 181
>> ++++++++++++++++++++++++++++++++++++++-
>>>  include/hw/virtio/virtio-iommu.h |   6 ++
>>>  target/arm/kvm.c                 |  27 ++++++
>>>  target/arm/trace-events          |   3 +
>>>  5 files changed, 219 insertions(+), 3 deletions(-)
>>>
>>> --
>>> 1.9.3
>>>
>>>
>>
>> --
>> Linu cherian



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