include/linux/intel-svm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright © 2015 Intel Corporation.
   4  *
   5  * Authors: David Woodhouse <David.Woodhouse@intel.com>
   6  */
   7
   8 #ifndef __INTEL_SVM_H__
   9 #define __INTEL_SVM_H__
  10
  11 /* Values for rxwp in fault_cb callback */
  12 #define SVM_REQ_READ    (1<<3)
  13 #define SVM_REQ_WRITE   (1<<2)
  14 #define SVM_REQ_EXEC    (1<<1)
  15 #define SVM_REQ_PRIV    (1<<0)
  16
  17 /*
  18  * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
  19  * for access to kernel addresses. No IOTLB flushes are automatically done
  20  * for kernel mappings; it is valid only for access to the kernel's static
  21  * 1:1 mapping of physical memory — not to vmalloc or even module mappings.
  22  * A future API addition may permit the use of such ranges, by means of an
  23  * explicit IOTLB flush call (akin to the DMA API's unmap method).
  24  *
  25  * It is unlikely that we will ever hook into flush_tlb_kernel_range() to
  26  * do such IOTLB flushes automatically.
  27  */
  28 #define SVM_FLAG_SUPERVISOR_MODE        BIT(0)
  29 /*
  30  * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
  31  * processes. Compared to the host bind, the primary differences are:
  32  * 1. mm life cycle management
  33  * 2. fault reporting
  34  */
  35 #define SVM_FLAG_GUEST_MODE             BIT(1)
  36 /*
  37  * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
  38  * which requires guest and host PASID translation at both directions.
  39  */
  40 #define SVM_FLAG_GUEST_PASID            BIT(2)
  41
  42 #endif /* __INTEL_SVM_H__ */