/* SPDX-License-Identifier: MIT */ /****************************************************************************** * callback.h * * Register guest OS callbacks with Xen. * * Copyright (c) 2006, Ian Campbell */ #ifndef __XEN_PUBLIC_CALLBACK_H__ #define __XEN_PUBLIC_CALLBACK_H__ #include <xen/interface/xen.h> /* * Prototype for this hypercall is: * long callback_op(int cmd, void *extra_args) * @cmd == CALLBACKOP_??? (callback operation). * @extra_args == Operation-specific extra arguments (NULL if none). */ /* x86: Callback for event delivery. */ #define CALLBACKTYPE_event … /* x86: Failsafe callback when guest state cannot be restored by Xen. */ #define CALLBACKTYPE_failsafe … /* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */ #define CALLBACKTYPE_syscall … /* * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel * feature is enabled. Do not use this callback type in new code. */ #define CALLBACKTYPE_sysenter_deprecated … /* x86: Callback for NMI delivery. */ #define CALLBACKTYPE_nmi … /* * x86: sysenter is only available as follows: * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs * ('32-on-32-on-64', '32-on-64-on-64') * [nb. also 64-bit guest applications on Intel CPUs * ('64-on-64-on-64'), but syscall is preferred] */ #define CALLBACKTYPE_sysenter … /* * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs * ('32-on-32-on-64', '32-on-64-on-64') */ #define CALLBACKTYPE_syscall32 … /* * Disable event deliver during callback? This flag is ignored for event and * NMI callbacks: event delivery is unconditionally disabled. */ #define _CALLBACKF_mask_events … #define CALLBACKF_mask_events … /* * Register a callback. */ #define CALLBACKOP_register … struct callback_register { … }; /* * Unregister a callback. * * Not all callbacks can be unregistered. -EINVAL will be returned if * you attempt to unregister such a callback. */ #define CALLBACKOP_unregister … struct callback_unregister { … }; #endif /* __XEN_PUBLIC_CALLBACK_H__ */
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