-
Jean-Philippe Brucker authored
Ease future extensions of struct iommu_fault_page_request and struct iommu_fault_unrecoverable by adding a few bytes of padding. That way, a new field can be added to either of these structures by simply introducing a new flag. To extend it after the size limit is reached, a new fault reporting structure will have to be negotiated with userspace. With 56 bytes of padding, the total size of iommu_fault is 64 bytes and fits in a cache line on a lot of contemporary machines, while providing 16 and 24 bytes of extension to structures iommu_fault_page_request and iommu_fault_unrecoverable respectively. Signed-off-by:
Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Acked-by:
Jacob Pan <jacob.jun.pan@linux.intel.com> Reviewed-by:
Eric Auger <eric.auger@redhat.com> Signed-off-by:
Joerg Roedel <jroedel@suse.de>
Jean-Philippe Brucker authoredEase future extensions of struct iommu_fault_page_request and struct iommu_fault_unrecoverable by adding a few bytes of padding. That way, a new field can be added to either of these structures by simply introducing a new flag. To extend it after the size limit is reached, a new fault reporting structure will have to be negotiated with userspace. With 56 bytes of padding, the total size of iommu_fault is 64 bytes and fits in a cache line on a lot of contemporary machines, while providing 16 and 24 bytes of extension to structures iommu_fault_page_request and iommu_fault_unrecoverable respectively. Signed-off-by:
Loading