Re: [PATCH v4 15/17] iommufd: Add a selftest

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On 11/7/22 7:49 PM, Jason Gunthorpe wrote:
> Cover the essential functionality of the iommufd with a directed
> test. This aims to achieve reasonable functional coverage using the
> in-kernel self test framework.
> 
> It provides a mock kernel module for the iommu_domain that allows it to
> run without any HW and the mocking provides a way to directly validate
> that the PFNs loaded into the iommu_domain are correct.
> 
> The mock also simulates the rare case of PAGE_SIZE > iommu page size as
> the mock will operate at a 2K iommu page size. This allows exercising all
> of the calculations to support this mismatch.
> 
> This allows achieving high coverage of the corner cases in the iopt_pages.
> 
> However, it is an unusually invasive config option to enable all of
> this. The config option should not be enabled in a production kernel.
> 
> Tested-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>

Ran the selftests on s390 in both LPAR (z16) and a QEMU kvm guest using 1M hugepages, all tests are passing.

Tested-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx> # s390



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