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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callback.h (2502B)

      1/* SPDX-License-Identifier: MIT */
      2/******************************************************************************
      3 * callback.h
      4 *
      5 * Register guest OS callbacks with Xen.
      6 *
      7 * Copyright (c) 2006, Ian Campbell
      8 */
      9
     10#ifndef __XEN_PUBLIC_CALLBACK_H__
     11#define __XEN_PUBLIC_CALLBACK_H__
     12
     13#include <xen/interface/xen.h>
     14
     15/*
     16 * Prototype for this hypercall is:
     17 *   long callback_op(int cmd, void *extra_args)
     18 * @cmd        == CALLBACKOP_??? (callback operation).
     19 * @extra_args == Operation-specific extra arguments (NULL if none).
     20 */
     21
     22/* x86: Callback for event delivery. */
     23#define CALLBACKTYPE_event                 0
     24
     25/* x86: Failsafe callback when guest state cannot be restored by Xen. */
     26#define CALLBACKTYPE_failsafe              1
     27
     28/* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
     29#define CALLBACKTYPE_syscall               2
     30
     31/*
     32 * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
     33 *     feature is enabled. Do not use this callback type in new code.
     34 */
     35#define CALLBACKTYPE_sysenter_deprecated   3
     36
     37/* x86: Callback for NMI delivery. */
     38#define CALLBACKTYPE_nmi                   4
     39
     40/*
     41 * x86: sysenter is only available as follows:
     42 * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
     43 * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
     44 *                      ('32-on-32-on-64', '32-on-64-on-64')
     45 *                      [nb. also 64-bit guest applications on Intel CPUs
     46 *                           ('64-on-64-on-64'), but syscall is preferred]
     47 */
     48#define CALLBACKTYPE_sysenter              5
     49
     50/*
     51 * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
     52 *                    ('32-on-32-on-64', '32-on-64-on-64')
     53 */
     54#define CALLBACKTYPE_syscall32             7
     55
     56/*
     57 * Disable event deliver during callback? This flag is ignored for event and
     58 * NMI callbacks: event delivery is unconditionally disabled.
     59 */
     60#define _CALLBACKF_mask_events             0
     61#define CALLBACKF_mask_events              (1U << _CALLBACKF_mask_events)
     62
     63/*
     64 * Register a callback.
     65 */
     66#define CALLBACKOP_register                0
     67struct callback_register {
     68	uint16_t type;
     69	uint16_t flags;
     70	xen_callback_t address;
     71};
     72
     73/*
     74 * Unregister a callback.
     75 *
     76 * Not all callbacks can be unregistered. -EINVAL will be returned if
     77 * you attempt to unregister such a callback.
     78 */
     79#define CALLBACKOP_unregister              1
     80struct callback_unregister {
     81    uint16_t type;
     82    uint16_t _unused;
     83};
     84
     85#endif /* __XEN_PUBLIC_CALLBACK_H__ */