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
 15struct kvm_smm_seg_state_32 {
 16	u32 flags;
 17	u32 limit;
 18	u32 base;
 19} __packed;
 20
 21struct 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
 71struct kvm_smm_seg_state_64 {
 72	u16 selector;
 73	u16 attributes;
 74	u32 limit;
 75	u64 base;
 76};
 77
 78struct 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
137union kvm_smram {
138	struct kvm_smram_state_64 smram64;
139	struct kvm_smram_state_32 smram32;
140	u8 bytes[512];
141};
142
143static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
144{
145	kvm_make_request(KVM_REQ_SMI, vcpu);
146	return 0;
147}
148
149static inline bool is_smm(struct kvm_vcpu *vcpu)
150{
151	return vcpu->arch.hflags & HF_SMM_MASK;
152}
153
154void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
155void enter_smm(struct kvm_vcpu *vcpu);
156int emulator_leave_smm(struct x86_emulate_ctxt *ctxt);
157void process_smi(struct kvm_vcpu *vcpu);
158#else
159static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
160static 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