63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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/*
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* X86 specific Hyper-V initialization code.
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*
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* Copyright (C) 2016, Microsoft, Inc.
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*
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* Author : K. Y. Srinivasan <kys@microsoft.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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*/
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#include <linux/types.h>
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#include <asm/hypervisor.h>
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#include <asm/hyperv.h>
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#include <asm/mshyperv.h>
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#include <linux/version.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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void *hv_hypercall_pg;
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/*
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* This function is to be invoked early in the boot sequence after the
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* hypervisor has been detected.
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*
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* 1. Setup the hypercall page.
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*/
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void hyperv_init(void)
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{
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u64 guest_id;
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union hv_x64_msr_hypercall_contents hypercall_msr;
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if (x86_hyper != &x86_hyper_ms_hyperv)
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return;
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/*
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* Setup the hypercall page and enable hypercalls.
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* 1. Register the guest ID
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* 2. Enable the hypercall and register the hypercall page
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*/
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guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
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wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);
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hv_hypercall_pg = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
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if (hv_hypercall_pg == NULL) {
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wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
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return;
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}
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rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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hypercall_msr.enable = 1;
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hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);
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wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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}
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EXPORT_SYMBOL_GPL(hv_hypercall_pg);
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