Re: [dpdk-dev] Issue with VFIO/IOMMU

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 03-Sep-20 12:09 PM, Vikas Gupta wrote:
> Hi,
> 
>    I observe an issue with IOVA address returned by api
> rte_memzone_reserve_aligned (flags= RTE_MEMZONE_IOVA_CONTIG) used for queue
> memory allocation. With high level debugging, I notice that IOVA address
> returned in mz->iova is not mapped by VFIO_IOMMU_MAP_DMA so in turn SMMU
> exception is seen.

I'm not sure i follow.

How did you determine that to be the case, given that, by your own 
admission below, `vfio_type1_dma_mem_map` function is executed several 
times?

> 
> 
> 
> *Details for the setup*
> 
> Platform: Armv8 (Broadcom Stingray)
> 
> DPDK release: DPDK 20.08 <http://fast.dpdk.org/rel/dpdk-20.08.tar.xz>
> 
> PMD patch:
> 
> https://patches.dpdk.org/project/dpdk/list/?series=&submitter=1907&state=&q=&archive=&delegate=
> 
> dpdk-test is launched using below command
> 
> *dpdk-test --vdev <cryptopmd_name> -w 0000:00:00.0 --iova-mode pa *
> 
> 
> 
> The test suite is launched over dpdk-test application command prompt using
> command ‘cryptodev_<cryptopmd_name>_autotest’
> 
> The issue is seen when several iterations of above test_suite is executed
> which in turn do multiple calls to rte_memzone_reserve_aligned,
> rte_mempool_create and rte_memzone_free, rte_mempool_free.
> 
>   Function *vfio_type1_dma_mem_map* with map/unmap event is executed several
> times during test_suite run.
> 
> 
> 
> Any inputs would be helpful.
> 
> 
> 
> Thanks,
> 
> Vikas
> 


-- 
Thanks,
Anatoly