arch/x86/kvm/smm.h

   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