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The HV_REGISTER_ are used as arguments to hv_set/get_register(), which delegate to arch-specific mechanisms for getting/setting synthetic Hyper-V MSRs. On arm64, HV_REGISTER_ defines are synthetic VP registers accessed via the get/set vp registers hypercalls. The naming matches the TLFS document, although these register names are not specific to arm64. However, on x86 the prefix HV_REGISTER_ indicates Hyper-V MSRs accessed via rdmsrl()/wrmsrl(). This is not consistent with the TLFS doc, where HV_REGISTER_ is *only* used for used for VP register names used by the get/set register hypercalls. To fix this inconsistency and prevent future confusion, change the arch-generic aliases used by callers of hv_set/get_register() to have the prefix HV_MSR_ instead of HV_REGISTER_. Use the prefix HV_X64_MSR_ for the x86-only Hyper-V MSRs. On x86, the generic HV_MSR_'s point to the corresponding HV_X64_MSR_. Move the arm64 HV_REGISTER_* defines to the asm-generic hyperv-tlfs.h, since these are not specific to arm64. On arm64, the generic HV_MSR_'s point to the corresponding HV_REGISTER_. While at it, rename hv_get/set_registers() and related functions to hv_get/set_msr(), hv_get/set_nested_msr(), etc. These are only used for Hyper-V MSRs and this naming makes that clear. Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com> Reviewed-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Link: https://lore.kernel.org/r/1708440933-27125-1-git-send-email-nunodasneves@linux.microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org> Message-ID: <1708440933-27125-1-git-send-email-nunodasneves@linux.microsoft.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Linux-specific definitions for managing interactions with Microsoft's
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* Hyper-V hypervisor. The definitions in this file are specific to
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* the ARM64 architecture. See include/asm-generic/mshyperv.h for
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* definitions are that architecture independent.
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*
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* Definitions that are specified in the Hyper-V Top Level Functional
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* Spec (TLFS) should not go in this file, but should instead go in
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* hyperv-tlfs.h.
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*
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* Copyright (C) 2021, Microsoft, Inc.
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*
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* Author : Michael Kelley <mikelley@microsoft.com>
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*/
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#ifndef _ASM_MSHYPERV_H
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#define _ASM_MSHYPERV_H
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#include <linux/types.h>
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#include <linux/arm-smccc.h>
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#include <asm/hyperv-tlfs.h>
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/*
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* Declare calls to get and set Hyper-V VP register values on ARM64, which
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* requires a hypercall.
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*/
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void hv_set_vpreg(u32 reg, u64 value);
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u64 hv_get_vpreg(u32 reg);
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void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
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static inline void hv_set_msr(unsigned int reg, u64 value)
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{
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hv_set_vpreg(reg, value);
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}
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static inline u64 hv_get_msr(unsigned int reg)
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{
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return hv_get_vpreg(reg);
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}
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/* SMCCC hypercall parameters */
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#define HV_SMCCC_FUNC_NUMBER 1
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#define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \
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ARM_SMCCC_STD_CALL, \
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ARM_SMCCC_SMC_64, \
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ARM_SMCCC_OWNER_VENDOR_HYP, \
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HV_SMCCC_FUNC_NUMBER)
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#include <asm-generic/mshyperv.h>
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#endif
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