1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * AMD Encrypted Register State Support
4 *
5 * Author: Joerg Roedel <jroedel@suse.de>
6 */
7
8 #ifndef __ASM_ENCRYPTED_STATE_H
9 #define __ASM_ENCRYPTED_STATE_H
10
11 #include <linux/types.h>
12 #include <asm/insn.h>
13 #include <asm/sev-common.h>
14 #include <asm/bootparam.h>
15
16 #define GHCB_PROTOCOL_MIN 1ULL
17 #define GHCB_PROTOCOL_MAX 2ULL
18 #define GHCB_DEFAULT_USAGE 0ULL
19
20 #define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
21
22 enum es_result {
23 ES_OK, /* All good */
24 ES_UNSUPPORTED, /* Requested operation not supported */
25 ES_VMM_ERROR, /* Unexpected state from the VMM */
26 ES_DECODE_FAILED, /* Instruction decoding failed */
27 ES_EXCEPTION, /* Instruction caused exception */
28 ES_RETRY, /* Retry instruction emulation */
29 };
30
31 struct es_fault_info {
32 unsigned long vector;
33 unsigned long error_code;
34 unsigned long cr2;
35 };
36
37 struct pt_regs;
38
39 /* ES instruction emulation context */
40 struct es_em_ctxt {
41 struct pt_regs *regs;
42 struct insn insn;
43 struct es_fault_info fi;
44 };
45
46 /*
47 * AMD SEV Confidential computing blob structure. The structure is
48 * defined in OVMF UEFI firmware header:
49 * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
50 */
51 #define CC_BLOB_SEV_HDR_MAGIC 0x45444d41
52 struct cc_blob_sev_info {
53 u32 magic;
54 u16 version;
55 u16 reserved;
56 u64 secrets_phys;
57 u32 secrets_len;
58 u32 rsvd1;
59 u64 cpuid_phys;
60 u32 cpuid_len;
61 u32 rsvd2;
62 } __packed;
63
64 void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
65
lower_bits(u64 val,unsigned int bits)66 static inline u64 lower_bits(u64 val, unsigned int bits)
67 {
68 u64 mask = (1ULL << bits) - 1;
69
70 return (val & mask);
71 }
72
73 struct real_mode_header;
74 enum stack_type;
75
76 /* Early IDT entry points for #VC handler */
77 extern void vc_no_ghcb(void);
78 extern void vc_boot_ghcb(void);
79 extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
80
81 /* Software defined (when rFlags.CF = 1) */
82 #define PVALIDATE_FAIL_NOUPDATE 255
83
84 /* RMP page size */
85 #define RMP_PG_SIZE_4K 0
86
87 #define RMPADJUST_VMSA_PAGE_BIT BIT(16)
88
89 /* SNP Guest message request */
90 struct snp_req_data {
91 unsigned long req_gpa;
92 unsigned long resp_gpa;
93 unsigned long data_gpa;
94 unsigned int data_npages;
95 };
96
97 struct sev_guest_platform_data {
98 u64 secrets_gpa;
99 };
100
101 /*
102 * The secrets page contains 96-bytes of reserved field that can be used by
103 * the guest OS. The guest OS uses the area to save the message sequence
104 * number for each VMPCK.
105 *
106 * See the GHCB spec section Secret page layout for the format for this area.
107 */
108 struct secrets_os_area {
109 u32 msg_seqno_0;
110 u32 msg_seqno_1;
111 u32 msg_seqno_2;
112 u32 msg_seqno_3;
113 u64 ap_jump_table_pa;
114 u8 rsvd[40];
115 u8 guest_usage[32];
116 } __packed;
117
118 #define VMPCK_KEY_LEN 32
119
120 /* See the SNP spec version 0.9 for secrets page format */
121 struct snp_secrets_page_layout {
122 u32 version;
123 u32 imien : 1,
124 rsvd1 : 31;
125 u32 fms;
126 u32 rsvd2;
127 u8 gosvw[16];
128 u8 vmpck0[VMPCK_KEY_LEN];
129 u8 vmpck1[VMPCK_KEY_LEN];
130 u8 vmpck2[VMPCK_KEY_LEN];
131 u8 vmpck3[VMPCK_KEY_LEN];
132 struct secrets_os_area os_area;
133 u8 rsvd3[3840];
134 } __packed;
135
136 #ifdef CONFIG_AMD_MEM_ENCRYPT
137 extern struct static_key_false sev_es_enable_key;
138 extern void __sev_es_ist_enter(struct pt_regs *regs);
139 extern void __sev_es_ist_exit(void);
sev_es_ist_enter(struct pt_regs * regs)140 static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
141 {
142 if (static_branch_unlikely(&sev_es_enable_key))
143 __sev_es_ist_enter(regs);
144 }
sev_es_ist_exit(void)145 static __always_inline void sev_es_ist_exit(void)
146 {
147 if (static_branch_unlikely(&sev_es_enable_key))
148 __sev_es_ist_exit();
149 }
150 extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
151 extern void __sev_es_nmi_complete(void);
sev_es_nmi_complete(void)152 static __always_inline void sev_es_nmi_complete(void)
153 {
154 if (static_branch_unlikely(&sev_es_enable_key))
155 __sev_es_nmi_complete();
156 }
157 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
158
rmpadjust(unsigned long vaddr,bool rmp_psize,unsigned long attrs)159 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
160 {
161 int rc;
162
163 /* "rmpadjust" mnemonic support in binutils 2.36 and newer */
164 asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
165 : "=a"(rc)
166 : "a"(vaddr), "c"(rmp_psize), "d"(attrs)
167 : "memory", "cc");
168
169 return rc;
170 }
pvalidate(unsigned long vaddr,bool rmp_psize,bool validate)171 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
172 {
173 bool no_rmpupdate;
174 int rc;
175
176 /* "pvalidate" mnemonic support in binutils 2.36 and newer */
177 asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
178 CC_SET(c)
179 : CC_OUT(c) (no_rmpupdate), "=a"(rc)
180 : "a"(vaddr), "c"(rmp_psize), "d"(validate)
181 : "memory", "cc");
182
183 if (no_rmpupdate)
184 return PVALIDATE_FAIL_NOUPDATE;
185
186 return rc;
187 }
188 void setup_ghcb(void);
189 void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
190 unsigned int npages);
191 void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
192 unsigned int npages);
193 void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
194 void snp_set_memory_shared(unsigned long vaddr, unsigned int npages);
195 void snp_set_memory_private(unsigned long vaddr, unsigned int npages);
196 void snp_set_wakeup_secondary_cpu(void);
197 bool snp_init(struct boot_params *bp);
198 void __init __noreturn snp_abort(void);
199 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned long *fw_err);
200 #else
sev_es_ist_enter(struct pt_regs * regs)201 static inline void sev_es_ist_enter(struct pt_regs *regs) { }
sev_es_ist_exit(void)202 static inline void sev_es_ist_exit(void) { }
sev_es_setup_ap_jump_table(struct real_mode_header * rmh)203 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
sev_es_nmi_complete(void)204 static inline void sev_es_nmi_complete(void) { }
sev_es_efi_map_ghcbs(pgd_t * pgd)205 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
pvalidate(unsigned long vaddr,bool rmp_psize,bool validate)206 static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
rmpadjust(unsigned long vaddr,bool rmp_psize,unsigned long attrs)207 static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
setup_ghcb(void)208 static inline void setup_ghcb(void) { }
209 static inline void __init
early_snp_set_memory_private(unsigned long vaddr,unsigned long paddr,unsigned int npages)210 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned int npages) { }
211 static inline void __init
early_snp_set_memory_shared(unsigned long vaddr,unsigned long paddr,unsigned int npages)212 early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned int npages) { }
snp_prep_memory(unsigned long paddr,unsigned int sz,enum psc_op op)213 static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
snp_set_memory_shared(unsigned long vaddr,unsigned int npages)214 static inline void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) { }
snp_set_memory_private(unsigned long vaddr,unsigned int npages)215 static inline void snp_set_memory_private(unsigned long vaddr, unsigned int npages) { }
snp_set_wakeup_secondary_cpu(void)216 static inline void snp_set_wakeup_secondary_cpu(void) { }
snp_init(struct boot_params * bp)217 static inline bool snp_init(struct boot_params *bp) { return false; }
snp_abort(void)218 static inline void snp_abort(void) { }
snp_issue_guest_request(u64 exit_code,struct snp_req_data * input,unsigned long * fw_err)219 static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input,
220 unsigned long *fw_err)
221 {
222 return -ENOTTY;
223 }
224 #endif
225
226 #endif
227