summaryrefslogtreecommitdiffstats
path: root/arch/x86/kvm/svm/svm_onhyperv.h
blob: c53b8bf8d01386d716ebb35c470c1619e09826a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * KVM L1 hypervisor optimizations on Hyper-V for SVM.
 */

#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
#define __ARCH_X86_KVM_SVM_ONHYPERV_H__

#if IS_ENABLED(CONFIG_HYPERV)
#include <asm/mshyperv.h>

#include "hyperv.h"
#include "kvm_onhyperv.h"

static struct kvm_x86_ops svm_x86_ops;

/*
 * Hyper-V uses the software reserved 32 bytes in VMCB
 * control area to expose SVM enlightenments to guests.
 */
struct hv_enlightenments {
	struct __packed hv_enlightenments_control {
		u32 nested_flush_hypercall:1;
		u32 msr_bitmap:1;
		u32 enlightened_npt_tlb: 1;
		u32 reserved:29;
	} __packed hv_enlightenments_control;
	u32 hv_vp_id;
	u64 hv_vm_id;
	u64 partition_assist_page;
	u64 reserved;
} __packed;

/*
 * Hyper-V uses the software reserved clean bit in VMCB
 */
#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW

int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu);

static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
	struct hv_enlightenments *hve =
		(struct hv_enlightenments *)vmcb->control.reserved_sw;

	if (npt_enabled &&
	    ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
		hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
}

static inline void svm_hv_hardware_setup(void)
{
	if (npt_enabled &&
	    ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
		pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
		svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
		svm_x86_ops.tlb_remote_flush_with_range =
				hv_remote_flush_tlb_with_range;
	}

	if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
		int cpu;

		pr_info("kvm: Hyper-V Direct TLB Flush enabled\n");
		for_each_online_cpu(cpu) {
			struct hv_vp_assist_page *vp_ap =
				hv_get_vp_assist_page(cpu);

			if (!vp_ap)
				continue;

			vp_ap->nested_control.features.directhypercall = 1;
		}
		svm_x86_ops.enable_direct_tlbflush =
				svm_hv_enable_direct_tlbflush;
	}
}

static inline void svm_hv_vmcb_dirty_nested_enlightenments(
		struct kvm_vcpu *vcpu)
{
	struct vmcb *vmcb = to_svm(vcpu)->vmcb;
	struct hv_enlightenments *hve =
		(struct hv_enlightenments *)vmcb->control.reserved_sw;

	/*
	 * vmcb can be NULL if called during early vcpu init.
	 * And its okay not to mark vmcb dirty during vcpu init
	 * as we mark it dirty unconditionally towards end of vcpu
	 * init phase.
	 */
	if (vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) &&
	    hve->hv_enlightenments_control.msr_bitmap)
		vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
}

static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
		struct kvm_vcpu *vcpu)
{
	struct hv_enlightenments *hve =
		(struct hv_enlightenments *)vmcb->control.reserved_sw;
	u32 vp_index = kvm_hv_get_vpindex(vcpu);

	if (hve->hv_vp_id != vp_index) {
		hve->hv_vp_id = vp_index;
		vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
	}
}
#else

static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
}

static inline void svm_hv_hardware_setup(void)
{
}

static inline void svm_hv_vmcb_dirty_nested_enlightenments(
		struct kvm_vcpu *vcpu)
{
}

static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
		struct kvm_vcpu *vcpu)
{
}
#endif /* CONFIG_HYPERV */

#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */