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1/* SPDX-License-Identifier: GPL-2.0 */
2
3/*
4 * Linux-specific definitions for managing interactions with Microsoft's
5 * Hyper-V hypervisor. The definitions in this file are specific to
6 * the ARM64 architecture. See include/asm-generic/mshyperv.h for
7 * definitions are that architecture independent.
8 *
9 * Definitions that are derived from Hyper-V code or headers should not go in
10 * this file, but should instead go in the relevant files in include/hyperv.
11 *
12 * Copyright (C) 2021, Microsoft, Inc.
13 *
14 * Author : Michael Kelley <mikelley@microsoft.com>
15 */
16
17#ifndef _ASM_MSHYPERV_H
18#define _ASM_MSHYPERV_H
19
20#include <linux/types.h>
21#include <linux/arm-smccc.h>
22#include <hyperv/hvhdk.h>
23
24/*
25 * Declare calls to get and set Hyper-V VP register values on ARM64, which
26 * requires a hypercall.
27 */
28
29void hv_set_vpreg(u32 reg, u64 value);
30u64 hv_get_vpreg(u32 reg);
31void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
32
33static inline void hv_set_msr(unsigned int reg, u64 value)
34{
35 hv_set_vpreg(reg, value);
36}
37
38static inline u64 hv_get_msr(unsigned int reg)
39{
40 return hv_get_vpreg(reg);
41}
42
43/*
44 * Nested is not supported on arm64
45 */
46static inline void hv_set_non_nested_msr(unsigned int reg, u64 value)
47{
48 hv_set_msr(reg, value);
49}
50
51static inline u64 hv_get_non_nested_msr(unsigned int reg)
52{
53 return hv_get_msr(reg);
54}
55
56/* SMCCC hypercall parameters */
57#define HV_SMCCC_FUNC_NUMBER 1
58#define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \
59 ARM_SMCCC_STD_CALL, \
60 ARM_SMCCC_SMC_64, \
61 ARM_SMCCC_OWNER_VENDOR_HYP, \
62 HV_SMCCC_FUNC_NUMBER)
63
64#include <asm-generic/mshyperv.h>
65
66#endif