1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Hyper-V specific functions.
4 *
5 * Copyright (C) 2021, Red Hat Inc.
6 */
7 #include <stdint.h>
8 #include "processor.h"
9 #include "hyperv.h"
10
11 struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,
12 vm_vaddr_t *p_hv_pages_gva)
13 {
14 vm_vaddr_t hv_pages_gva = vm_vaddr_alloc_page(vm);
15 struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva);
16
17 /* Setup of a region of guest memory for the VP Assist page. */
18 hv->vp_assist = (void *)vm_vaddr_alloc_page(vm);
19 hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);
20 hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);
21
22 /* Setup of a region of guest memory for the partition assist page. */
23 hv->partition_assist = (void *)vm_vaddr_alloc_page(vm);
24 hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);
25 hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);
26
27 /* Setup of a region of guest memory for the enlightened VMCS. */
28 hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);
29 hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);
30 hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs);
31
32 *p_hv_pages_gva = hv_pages_gva;
33 return hv;
34 }
35
36 int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist)
37 {
38 uint64_t val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) |
39 HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
40
41 wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val);
42
43 current_vp_assist = vp_assist;
44
45 return 0;
46 }
47
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