blob: f381b9255bb7066fb51798385a0d839e27cb7f32 (
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/** @file
Secure Encrypted Virtualization (SEV) library helper function
Copyright (c) 2020, AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/PcdLib.h>
#include <Register/Amd/Cpuid.h>
#include <Register/Amd/Msr.h>
#include <Register/Cpuid.h>
#include <Uefi/UefiBaseType.h>
/**
Read the workarea to determine whether SEV is enabled. If enabled,
then return the SevEsWorkArea pointer.
**/
STATIC
SEC_SEV_ES_WORK_AREA *
EFIAPI
GetSevEsWorkArea (
VOID
)
{
OVMF_WORK_AREA *WorkArea;
WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
//
// If its not SEV guest then SevEsWorkArea is not valid.
//
if ((WorkArea == NULL) || (WorkArea->Header.GuestType != CcGuestTypeAmdSev)) {
return NULL;
}
return (SEC_SEV_ES_WORK_AREA *)FixedPcdGet32 (PcdSevEsWorkAreaBase);
}
/**
Read the SEV Status MSR value from the workarea
**/
STATIC
UINT32
EFIAPI
InternalMemEncryptSevStatus (
VOID
)
{
SEC_SEV_ES_WORK_AREA *SevEsWorkArea;
SevEsWorkArea = GetSevEsWorkArea ();
if (SevEsWorkArea == NULL) {
return 0;
}
return (UINT32)(UINTN)SevEsWorkArea->SevStatusMsrValue;
}
/**
Returns a boolean to indicate whether SEV-SNP is enabled.
@retval TRUE SEV-SNP is enabled
@retval FALSE SEV-SNP is not enabled
**/
BOOLEAN
EFIAPI
MemEncryptSevSnpIsEnabled (
VOID
)
{
MSR_SEV_STATUS_REGISTER Msr;
Msr.Uint32 = InternalMemEncryptSevStatus ();
return Msr.Bits.SevSnpBit ? TRUE : FALSE;
}
/**
Returns a boolean to indicate whether SEV-ES is enabled.
@retval TRUE SEV-ES is enabled
@retval FALSE SEV-ES is not enabled
**/
BOOLEAN
EFIAPI
MemEncryptSevEsIsEnabled (
VOID
)
{
MSR_SEV_STATUS_REGISTER Msr;
Msr.Uint32 = InternalMemEncryptSevStatus ();
return Msr.Bits.SevEsBit ? TRUE : FALSE;
}
/**
Returns a boolean to indicate whether SEV is enabled.
@retval TRUE SEV is enabled
@retval FALSE SEV is not enabled
**/
BOOLEAN
EFIAPI
MemEncryptSevIsEnabled (
VOID
)
{
MSR_SEV_STATUS_REGISTER Msr;
Msr.Uint32 = InternalMemEncryptSevStatus ();
return Msr.Bits.SevBit ? TRUE : FALSE;
}
/**
Returns the SEV encryption mask.
@return The SEV pagtable encryption mask
**/
UINT64
EFIAPI
MemEncryptSevGetEncryptionMask (
VOID
)
{
SEC_SEV_ES_WORK_AREA *SevEsWorkArea;
SevEsWorkArea = GetSevEsWorkArea ();
if (SevEsWorkArea == NULL) {
return 0;
}
return SevEsWorkArea->EncryptionMask;
}
/**
Returns a boolean to indicate whether DebugVirtualization is enabled.
@retval TRUE DebugVirtualization is enabled
@retval FALSE DebugVirtualization is not enabled
**/
BOOLEAN
EFIAPI
MemEncryptSevEsDebugVirtualizationIsEnabled (
VOID
)
{
MSR_SEV_STATUS_REGISTER Msr;
Msr.Uint32 = InternalMemEncryptSevStatus ();
return Msr.Bits.DebugVirtualization ? TRUE : FALSE;
}
|
