diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/intel-svm.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h index dd94ab45a4db..0a48ccff24ae 100644 --- a/include/linux/intel-svm.h +++ b/include/linux/intel-svm.h @@ -40,7 +40,20 @@ struct svm_dev_ops { * disambiguate between multiple device contexts which access the same MM, * if there is no other way to do so. It should be used sparingly, if at all. */ -#define SVM_FLAG_PRIVATE_PASID (1<<0) +#define SVM_FLAG_PRIVATE_PASID (1<<0) + +/* + * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only + * for access to kernel addresses. No IOTLB flushes are automatically done + * for kernel mappings; it is valid only for access to the kernel's static + * 1:1 mapping of physical memory — not to vmalloc or even module mappings. + * A future API addition may permit the use of such ranges, by means of an + * explicit IOTLB flush call (akin to the DMA API's unmap method). + * + * It is unlikely that we will ever hook into flush_tlb_kernel_range() to + * do such IOTLB flushes automatically. + */ +#define SVM_FLAG_SUPERVISOR_MODE (1<<1) /** * intel_svm_bind_mm() - Bind the current process to a PASID |