1 /* SPDX-License-Identifier: GPL-2.0 */
3 * AMD SEV header common between the guest and the hypervisor.
5 * Author: Brijesh Singh <brijesh.singh@amd.com>
8 #ifndef __ASM_X86_SEV_COMMON_H
9 #define __ASM_X86_SEV_COMMON_H
11 #define GHCB_MSR_INFO_POS 0
12 #define GHCB_DATA_LOW 12
13 #define GHCB_MSR_INFO_MASK (BIT_ULL(GHCB_DATA_LOW) - 1)
15 #define GHCB_DATA(v) \
16 (((unsigned long)(v) & ~GHCB_MSR_INFO_MASK) >> GHCB_DATA_LOW)
18 /* SEV Information Request/Response */
19 #define GHCB_MSR_SEV_INFO_RESP 0x001
20 #define GHCB_MSR_SEV_INFO_REQ 0x002
22 #define GHCB_MSR_SEV_INFO(_max, _min, _cbit) \
23 /* GHCBData[63:48] */ \
24 ((((_max) & 0xffff) << 48) | \
25 /* GHCBData[47:32] */ \
26 (((_min) & 0xffff) << 32) | \
27 /* GHCBData[31:24] */ \
28 (((_cbit) & 0xff) << 24) | \
29 GHCB_MSR_SEV_INFO_RESP)
31 #define GHCB_MSR_INFO(v) ((v) & 0xfffUL)
32 #define GHCB_MSR_PROTO_MAX(v) (((v) >> 48) & 0xffff)
33 #define GHCB_MSR_PROTO_MIN(v) (((v) >> 32) & 0xffff)
35 /* CPUID Request/Response */
36 #define GHCB_MSR_CPUID_REQ 0x004
37 #define GHCB_MSR_CPUID_RESP 0x005
38 #define GHCB_MSR_CPUID_FUNC_POS 32
39 #define GHCB_MSR_CPUID_FUNC_MASK 0xffffffff
40 #define GHCB_MSR_CPUID_VALUE_POS 32
41 #define GHCB_MSR_CPUID_VALUE_MASK 0xffffffff
42 #define GHCB_MSR_CPUID_REG_POS 30
43 #define GHCB_MSR_CPUID_REG_MASK 0x3
44 #define GHCB_CPUID_REQ_EAX 0
45 #define GHCB_CPUID_REQ_EBX 1
46 #define GHCB_CPUID_REQ_ECX 2
47 #define GHCB_CPUID_REQ_EDX 3
48 #define GHCB_CPUID_REQ(fn, reg) \
49 /* GHCBData[11:0] */ \
50 (GHCB_MSR_CPUID_REQ | \
51 /* GHCBData[31:12] */ \
52 (((unsigned long)(reg) & 0x3) << 30) | \
53 /* GHCBData[63:32] */ \
54 (((unsigned long)fn) << 32))
57 #define GHCB_MSR_AP_RESET_HOLD_REQ 0x006
58 #define GHCB_MSR_AP_RESET_HOLD_RESP 0x007
60 /* GHCB GPA Register */
61 #define GHCB_MSR_REG_GPA_REQ 0x012
62 #define GHCB_MSR_REG_GPA_REQ_VAL(v) \
63 /* GHCBData[63:12] */ \
64 (((u64)((v) & GENMASK_ULL(51, 0)) << 12) | \
65 /* GHCBData[11:0] */ \
68 #define GHCB_MSR_REG_GPA_RESP 0x013
69 #define GHCB_MSR_REG_GPA_RESP_VAL(v) \
70 /* GHCBData[63:12] */ \
71 (((u64)(v) & GENMASK_ULL(63, 12)) >> 12)
74 * SNP Page State Change Operation
76 * GHCBData[55:52] - Page operation:
77 * 0x0001 Page assignment, Private
78 * 0x0002 Page assignment, Shared
81 SNP_PAGE_STATE_PRIVATE = 1,
82 SNP_PAGE_STATE_SHARED,
85 #define GHCB_MSR_PSC_REQ 0x014
86 #define GHCB_MSR_PSC_REQ_GFN(gfn, op) \
87 /* GHCBData[55:52] */ \
88 (((u64)((op) & 0xf) << 52) | \
89 /* GHCBData[51:12] */ \
90 ((u64)((gfn) & GENMASK_ULL(39, 0)) << 12) | \
91 /* GHCBData[11:0] */ \
94 #define GHCB_MSR_PSC_RESP 0x015
95 #define GHCB_MSR_PSC_RESP_VAL(val) \
96 /* GHCBData[63:32] */ \
97 (((u64)(val) & GENMASK_ULL(63, 32)) >> 32)
99 /* GHCB Hypervisor Feature Request/Response */
100 #define GHCB_MSR_HV_FT_REQ 0x080
101 #define GHCB_MSR_HV_FT_RESP 0x081
102 #define GHCB_MSR_HV_FT_RESP_VAL(v) \
103 /* GHCBData[63:12] */ \
104 (((u64)(v) & GENMASK_ULL(63, 12)) >> 12)
106 #define GHCB_HV_FT_SNP BIT_ULL(0)
107 #define GHCB_HV_FT_SNP_AP_CREATION BIT_ULL(1)
109 /* SNP Page State Change NAE event */
110 #define VMGEXIT_PSC_MAX_ENTRY 253
126 struct snp_psc_desc {
128 struct psc_entry entries[VMGEXIT_PSC_MAX_ENTRY];
131 /* Guest message request error codes */
132 #define SNP_GUEST_REQ_INVALID_LEN BIT_ULL(32)
133 #define SNP_GUEST_REQ_ERR_BUSY BIT_ULL(33)
135 #define GHCB_MSR_TERM_REQ 0x100
136 #define GHCB_MSR_TERM_REASON_SET_POS 12
137 #define GHCB_MSR_TERM_REASON_SET_MASK 0xf
138 #define GHCB_MSR_TERM_REASON_POS 16
139 #define GHCB_MSR_TERM_REASON_MASK 0xff
141 #define GHCB_SEV_TERM_REASON(reason_set, reason_val) \
142 /* GHCBData[15:12] */ \
143 (((((u64)reason_set) & 0xf) << 12) | \
144 /* GHCBData[23:16] */ \
145 ((((u64)reason_val) & 0xff) << 16))
147 /* Error codes from reason set 0 */
148 #define SEV_TERM_SET_GEN 0
149 #define GHCB_SEV_ES_GEN_REQ 0
150 #define GHCB_SEV_ES_PROT_UNSUPPORTED 1
151 #define GHCB_SNP_UNSUPPORTED 2
153 /* Linux-specific reason codes (used with reason set 1) */
154 #define SEV_TERM_SET_LINUX 1
155 #define GHCB_TERM_REGISTER 0 /* GHCB GPA registration failure */
156 #define GHCB_TERM_PSC 1 /* Page State Change failure */
157 #define GHCB_TERM_PVALIDATE 2 /* Pvalidate failure */
158 #define GHCB_TERM_NOT_VMPL0 3 /* SNP guest is not running at VMPL-0 */
159 #define GHCB_TERM_CPUID 4 /* CPUID-validation failure */
160 #define GHCB_TERM_CPUID_HV 5 /* CPUID failure during hypervisor fallback */
162 #define GHCB_RESP_CODE(v) ((v) & GHCB_MSR_INFO_MASK)
165 * Error codes related to GHCB input that can be communicated back to the guest
166 * by setting the lower 32-bits of the GHCB SW_EXITINFO1 field to 2.
168 #define GHCB_ERR_NOT_REGISTERED 1
169 #define GHCB_ERR_INVALID_USAGE 2
170 #define GHCB_ERR_INVALID_SCRATCH_AREA 3
171 #define GHCB_ERR_MISSING_INPUT 4
172 #define GHCB_ERR_INVALID_INPUT 5
173 #define GHCB_ERR_INVALID_EVENT 6