arch/arm64/include/asm/mshyperv.h

   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 specified in the Hyper-V Top Level Functional
  10  * Spec (TLFS) should not go in this file, but should instead go in
  11  * hyperv-tlfs.h.
  12  *
  13  * Copyright (C) 2021, Microsoft, Inc.
  14  *
  15  * Author : Michael Kelley <mikelley@microsoft.com>
  16  */
  17
  18 #ifndef _ASM_MSHYPERV_H
  19 #define _ASM_MSHYPERV_H
  20
  21 #include <linux/types.h>
  22 #include <linux/arm-smccc.h>
  23 #include <asm/hyperv-tlfs.h>
  24
  25 /*
  26  * Declare calls to get and set Hyper-V VP register values on ARM64, which
  27  * requires a hypercall.
  28  */
  29
  30 void hv_set_vpreg(u32 reg, u64 value);
  31 u64 hv_get_vpreg(u32 reg);
  32 void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
  33
  34 static inline void hv_set_msr(unsigned int reg, u64 value)
  35 {
  36         hv_set_vpreg(reg, value);
  37 }
  38
  39 static inline u64 hv_get_msr(unsigned int reg)
  40 {
  41         return hv_get_vpreg(reg);
  42 }
  43
  44 /* SMCCC hypercall parameters */
  45 #define HV_SMCCC_FUNC_NUMBER    1
  46 #define HV_FUNC_ID      ARM_SMCCC_CALL_VAL(                     \
  47                                 ARM_SMCCC_STD_CALL,             \
  48                                 ARM_SMCCC_SMC_64,               \
  49                                 ARM_SMCCC_OWNER_VENDOR_HYP,     \
  50                                 HV_SMCCC_FUNC_NUMBER)
  51
  52 #include <asm-generic/mshyperv.h>
  53
  54 #endif