1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef ASM_KVM_SMM_H
3 #define ASM_KVM_SMM_H
4
5 #include <linux/build_bug.h>
6
7 #ifdef CONFIG_KVM_SMM
8
9
10 /*
11 * 32 bit KVM's emulated SMM layout. Based on Intel P6 layout
12 * (https://www.sandpile.org/x86/smm.htm).
13 */
14
15 struct kvm_smm_seg_state_32 {
16 u32 flags;
17 u32 limit;
18 u32 base;
19 } __packed;
20
21 struct kvm_smram_state_32 {
22 u32 reserved1[62];
23 u32 smbase;
24 u32 smm_revision;
25 u16 io_inst_restart;
26 u16 auto_hlt_restart;
27 u32 io_restart_rdi;
28 u32 io_restart_rcx;
29 u32 io_restart_rsi;
30 u32 io_restart_rip;
31 u32 cr4;
32
33 /* A20M#, CPL, shutdown and other reserved/undocumented fields */
34 u16 reserved2;
35 u8 int_shadow; /* KVM extension */
36 u8 reserved3[17];
37
38 struct kvm_smm_seg_state_32 ds;
39 struct kvm_smm_seg_state_32 fs;
40 struct kvm_smm_seg_state_32 gs;
41 struct kvm_smm_seg_state_32 idtr; /* IDTR has only base and limit */
42 struct kvm_smm_seg_state_32 tr;
43 u32 reserved;
44 struct kvm_smm_seg_state_32 gdtr; /* GDTR has only base and limit */
45 struct kvm_smm_seg_state_32 ldtr;
46 struct kvm_smm_seg_state_32 es;
47 struct kvm_smm_seg_state_32 cs;
48 struct kvm_smm_seg_state_32 ss;
49
50 u32 es_sel;
51 u32 cs_sel;
52 u32 ss_sel;
53 u32 ds_sel;
54 u32 fs_sel;
55 u32 gs_sel;
56 u32 ldtr_sel;
57 u32 tr_sel;
58
59 u32 dr7;
60 u32 dr6;
61 u32 gprs[8]; /* GPRS in the "natural" X86 order (EAX/ECX/EDX.../EDI) */
62 u32 eip;
63 u32 eflags;
64 u32 cr3;
65 u32 cr0;
66 } __packed;
67
68
69 /* 64 bit KVM's emulated SMM layout. Based on AMD64 layout */
70
71 struct kvm_smm_seg_state_64 {
72 u16 selector;
73 u16 attributes;
74 u32 limit;
75 u64 base;
76 };
77
78 struct kvm_smram_state_64 {
79
80 struct kvm_smm_seg_state_64 es;
81 struct kvm_smm_seg_state_64 cs;
82 struct kvm_smm_seg_state_64 ss;
83 struct kvm_smm_seg_state_64 ds;
84 struct kvm_smm_seg_state_64 fs;
85 struct kvm_smm_seg_state_64 gs;
86 struct kvm_smm_seg_state_64 gdtr; /* GDTR has only base and limit*/
87 struct kvm_smm_seg_state_64 ldtr;
88 struct kvm_smm_seg_state_64 idtr; /* IDTR has only base and limit*/
89 struct kvm_smm_seg_state_64 tr;
90
91 /* I/O restart and auto halt restart are not implemented by KVM */
92 u64 io_restart_rip;
93 u64 io_restart_rcx;
94 u64 io_restart_rsi;
95 u64 io_restart_rdi;
96 u32 io_restart_dword;
97 u32 reserved1;
98 u8 io_inst_restart;
99 u8 auto_hlt_restart;
100 u8 amd_nmi_mask; /* Documented in AMD BKDG as NMI mask, not used by KVM */
101 u8 int_shadow;
102 u32 reserved2;
103
104 u64 efer;
105
106 /*
107 * Two fields below are implemented on AMD only, to store
108 * SVM guest vmcb address if the #SMI was received while in the guest mode.
109 */
110 u64 svm_guest_flag;
111 u64 svm_guest_vmcb_gpa;
112 u64 svm_guest_virtual_int; /* unknown purpose, not implemented */
113
114 u32 reserved3[3];
115 u32 smm_revison;
116 u32 smbase;
117 u32 reserved4[5];
118
119 /* ssp and svm_* fields below are not implemented by KVM */
120 u64 ssp;
121 u64 svm_guest_pat;
122 u64 svm_host_efer;
123 u64 svm_host_cr4;
124 u64 svm_host_cr3;
125 u64 svm_host_cr0;
126
127 u64 cr4;
128 u64 cr3;
129 u64 cr0;
130 u64 dr7;
131 u64 dr6;
132 u64 rflags;
133 u64 rip;
134 u64 gprs[16]; /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
135 };
136
137 union kvm_smram {
138 struct kvm_smram_state_64 smram64;
139 struct kvm_smram_state_32 smram32;
140 u8 bytes[512];
141 };
142
143 static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
144 {
145 kvm_make_request(KVM_REQ_SMI, vcpu);
146 return 0;
147 }
148
149 static inline bool is_smm(struct kvm_vcpu *vcpu)
150 {
151 return vcpu->arch.hflags & HF_SMM_MASK;
152 }
153
154 void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
155 void enter_smm(struct kvm_vcpu *vcpu);
156 int emulator_leave_smm(struct x86_emulate_ctxt *ctxt);
157 void process_smi(struct kvm_vcpu *vcpu);
158 #else
159 static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
160 static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
161
162 /*
163 * emulator_leave_smm is used as a function pointer, so the
164 * stub is defined in x86.c.
165 */
166 #endif
167
168 #endif
169
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