Re: [PATCH v6 4/4] iommufd/selftest: Add coverage for IOMMU_GET_HW_INFO ioctl

[Jason Gunthorpe]

On Fri, Aug 11, 2023 at 06:57:34AM +0000, Liu, Yi L wrote:
> > From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> > Sent: Thursday, August 10, 2023 12:46 AM
> > 
> > On Tue, Aug 08, 2023 at 08:35:10AM -0700, Yi Liu wrote:
> > > From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> > >
> > > Add a mock_domain_hw_info function and an iommu_test_hw_info data
> > > structure. This allows to test the IOMMU_GET_HW_INFO ioctl passing
> > > the test_reg value for the mock_dev.
> > >
> > > Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> > > Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
> > > ---
> > >  drivers/iommu/iommufd/iommufd_test.h          |  9 +++++++
> > >  drivers/iommu/iommufd/selftest.c              | 16 ++++++++++++
> > >  tools/testing/selftests/iommu/iommufd.c       | 17 +++++++++++-
> > >  tools/testing/selftests/iommu/iommufd_utils.h | 26 +++++++++++++++++++
> > >  4 files changed, 67 insertions(+), 1 deletion(-)
> > 
> > Don't forget to add it to fail_nth
> 
> Sure. Btw. Would you share us the rule on determining whether an ioctl/path
> requires fail_nth case or not.

It always requires it :)

Jason