88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Core routines for interacting with Microsoft's Hyper-V hypervisor,
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* including hypervisor initialization.
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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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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/version.h>
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#include <linux/cpuhotplug.h>
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#include <asm/mshyperv.h>
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static bool hyperv_initialized;
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static int __init hyperv_init(void)
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{
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struct hv_get_vp_registers_output result;
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u32 a, b, c, d;
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u64 guest_id;
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int ret;
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/*
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* Allow for a kernel built with CONFIG_HYPERV to be running in
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* a non-Hyper-V environment, including on DT instead of ACPI.
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* In such cases, do nothing and return success.
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*/
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if (acpi_disabled)
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return 0;
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if (strncmp((char *)&acpi_gbl_FADT.hypervisor_id, "MsHyperV", 8))
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return 0;
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/* Setup the guest ID */
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guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
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hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id);
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/* Get the features and hints from Hyper-V */
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hv_get_vpreg_128(HV_REGISTER_FEATURES, &result);
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ms_hyperv.features = result.as32.a;
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ms_hyperv.priv_high = result.as32.b;
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ms_hyperv.misc_features = result.as32.c;
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hv_get_vpreg_128(HV_REGISTER_ENLIGHTENMENTS, &result);
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ms_hyperv.hints = result.as32.a;
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pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n",
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ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints,
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ms_hyperv.misc_features);
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/* Get information about the Hyper-V host version */
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hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result);
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a = result.as32.a;
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b = result.as32.b;
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c = result.as32.c;
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d = result.as32.d;
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pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n",
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b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24);
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ret = hv_common_init();
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if (ret)
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return ret;
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/hyperv_init:online",
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hv_common_cpu_init, hv_common_cpu_die);
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if (ret < 0) {
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hv_common_free();
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return ret;
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}
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hyperv_initialized = true;
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return 0;
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}
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early_initcall(hyperv_init);
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bool hv_is_hyperv_initialized(void)
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{
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return hyperv_initialized;
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}
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EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
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