cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gntalloc.h (2619B)

      1/******************************************************************************
      2 * gntalloc.h
      3 *
      4 * Interface to /dev/xen/gntalloc.
      5 *
      6 * Author: Daniel De Graaf <dgdegra@tycho.nsa.gov>
      7 *
      8 * This file is in the public domain.
      9 */
     10
     11#ifndef __LINUX_PUBLIC_GNTALLOC_H__
     12#define __LINUX_PUBLIC_GNTALLOC_H__
     13
     14#include <linux/types.h>
     15
     16/*
     17 * Allocates a new page and creates a new grant reference.
     18 */
     19#define IOCTL_GNTALLOC_ALLOC_GREF \
     20_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref))
     21struct ioctl_gntalloc_alloc_gref {
     22	/* IN parameters */
     23	/* The ID of the domain to be given access to the grants. */
     24	__u16 domid;
     25	/* Flags for this mapping */
     26	__u16 flags;
     27	/* Number of pages to map */
     28	__u32 count;
     29	/* OUT parameters */
     30	/* The offset to be used on a subsequent call to mmap(). */
     31	__u64 index;
     32	/* The grant references of the newly created grant, one per page */
     33	/* Variable size, depending on count */
     34	__u32 gref_ids[1];
     35};
     36
     37#define GNTALLOC_FLAG_WRITABLE 1
     38
     39/*
     40 * Deallocates the grant reference, allowing the associated page to be freed if
     41 * no other domains are using it.
     42 */
     43#define IOCTL_GNTALLOC_DEALLOC_GREF \
     44_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref))
     45struct ioctl_gntalloc_dealloc_gref {
     46	/* IN parameters */
     47	/* The offset returned in the map operation */
     48	__u64 index;
     49	/* Number of references to unmap */
     50	__u32 count;
     51};
     52
     53/*
     54 * Sets up an unmap notification within the page, so that the other side can do
     55 * cleanup if this side crashes. Required to implement cross-domain robust
     56 * mutexes or close notification on communication channels.
     57 *
     58 * Each mapped page only supports one notification; multiple calls referring to
     59 * the same page overwrite the previous notification. You must clear the
     60 * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
     61 * to occur.
     62 */
     63#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \
     64_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify))
     65struct ioctl_gntalloc_unmap_notify {
     66	/* IN parameters */
     67	/* Offset in the file descriptor for a byte within the page (same as
     68	 * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
     69	 * be cleared. Otherwise, it can be any byte in the page whose
     70	 * notification we are adjusting.
     71	 */
     72	__u64 index;
     73	/* Action(s) to take on unmap */
     74	__u32 action;
     75	/* Event channel to notify */
     76	__u32 event_channel_port;
     77};
     78
     79/* Clear (set to zero) the byte specified by index */
     80#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
     81/* Send an interrupt on the indicated event channel */
     82#define UNMAP_NOTIFY_SEND_EVENT 0x2
     83
     84#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */