-
Fenghua Yu authored
Define idxd_copy_cr() to copy completion record to fault address in user address that is found by work queue (wq) and PASID. It will be used to write the user's completion record that the hardware device is not able to write due to user completion record page fault. An xarray is added to associate the PASID and mm with the struct idxd_user_context so mm can be found by PASID and wq. It is called when handling the completion record fault in a kernel thread context. Switch to the mm using kthread_use_vm() and copy the completion record to the mm via copy_to_user(). Once the copy is completed, switch back to the current mm using kthread_unuse_mm(). Suggested-by:
Christoph Hellwig <hch@infradead.org> Suggested-by:
Jason Gunthorpe <jgg@nvidia.com> Suggested-by:
Tony Luck <tony.luck@intel.com> Tested-by:
Tony Zhu <tony.zhu@intel.com> Signed-off-by:
Fenghua Yu <fenghua.yu@intel.com> Reviewed-by:
Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/20230407203143.2189681-9-fenghua.yu@intel.comSigned-off-by:
Vinod Koul <vkoul@kernel.org>
b022f597