88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
* Core routines for interacting with Microsoft's Hyper-V hypervisor,
|
|
* including hypervisor initialization.
|
|
*
|
|
* Copyright (C) 2021, Microsoft, Inc.
|
|
*
|
|
* Author : Michael Kelley <mikelley@microsoft.com>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/export.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/version.h>
|
|
#include <linux/cpuhotplug.h>
|
|
#include <asm/mshyperv.h>
|
|
|
|
static bool hyperv_initialized;
|
|
|
|
static int __init hyperv_init(void)
|
|
{
|
|
struct hv_get_vp_registers_output result;
|
|
u32 a, b, c, d;
|
|
u64 guest_id;
|
|
int ret;
|
|
|
|
/*
|
|
* Allow for a kernel built with CONFIG_HYPERV to be running in
|
|
* a non-Hyper-V environment, including on DT instead of ACPI.
|
|
* In such cases, do nothing and return success.
|
|
*/
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
if (strncmp((char *)&acpi_gbl_FADT.hypervisor_id, "MsHyperV", 8))
|
|
return 0;
|
|
|
|
/* Setup the guest ID */
|
|
guest_id = hv_generate_guest_id(LINUX_VERSION_CODE);
|
|
hv_set_vpreg(HV_REGISTER_GUEST_OSID, guest_id);
|
|
|
|
/* Get the features and hints from Hyper-V */
|
|
hv_get_vpreg_128(HV_REGISTER_FEATURES, &result);
|
|
ms_hyperv.features = result.as32.a;
|
|
ms_hyperv.priv_high = result.as32.b;
|
|
ms_hyperv.misc_features = result.as32.c;
|
|
|
|
hv_get_vpreg_128(HV_REGISTER_ENLIGHTENMENTS, &result);
|
|
ms_hyperv.hints = result.as32.a;
|
|
|
|
pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n",
|
|
ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints,
|
|
ms_hyperv.misc_features);
|
|
|
|
/* Get information about the Hyper-V host version */
|
|
hv_get_vpreg_128(HV_REGISTER_HYPERVISOR_VERSION, &result);
|
|
a = result.as32.a;
|
|
b = result.as32.b;
|
|
c = result.as32.c;
|
|
d = result.as32.d;
|
|
pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n",
|
|
b >> 16, b & 0xFFFF, a, d & 0xFFFFFF, c, d >> 24);
|
|
|
|
ret = hv_common_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cpuhp_setup_state(CPUHP_AP_HYPERV_ONLINE, "arm64/hyperv_init:online",
|
|
hv_common_cpu_init, hv_common_cpu_die);
|
|
if (ret < 0) {
|
|
hv_common_free();
|
|
return ret;
|
|
}
|
|
|
|
hyperv_initialized = true;
|
|
return 0;
|
|
}
|
|
|
|
early_initcall(hyperv_init);
|
|
|
|
bool hv_is_hyperv_initialized(void)
|
|
{
|
|
return hyperv_initialized;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
|