iommufd: Add check on user response code

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The response code from user space is only allowed to be SUCCESS or
INVALID. All other values are treated by the device as a response code of
Response Failure according to PCI spec, section 10.4.2.1.  This response
disables the Page Request Interface for the Function.

Add a check in iommufd_fault_fops_write() to avoid invalid response
code.

Fixes: 07838f7fd5 ("iommufd: Add iommufd fault object")
Link: https://lore.kernel.org/r/20240710083341.44617-3-baolu.lu@linux.intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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Lu Baolu 2024-07-10 16:33:40 +08:00 • committed by Jason Gunthorpe

parent 861f96a785

commit d73cf5ff74

1 changed files with 10 additions and 0 deletions

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drivers/iommu/iommufd/fault.c

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