patches/kernel/0025-KVM-x86-emulator-smm-add-structs-for-KVM-s-smram-lay.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Maxim Levitsky <mlevitsk@redhat.com>
   3 Date: Tue, 21 Jun 2022 18:08:58 +0300
   4 Subject: [PATCH] KVM: x86: emulator/smm: add structs for KVM's smram layout
   5
   6 Those structs will be used to read/write the smram state image.
   7
   8 Also document the differences between KVM's SMRAM layout and SMRAM
   9 layout that is used by real Intel/AMD cpus.
  10
  11 Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
  12 Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
  13 ---
  14  arch/x86/kvm/kvm_emulate.h | 139 +++++++++++++++++++++++++++++++++++++
  15  1 file changed, 139 insertions(+)
  16
  17 diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
  18 index 8dff25d267b7..3bbf7c1c5b18 100644
  19 --- a/arch/x86/kvm/kvm_emulate.h
  20 +++ b/arch/x86/kvm/kvm_emulate.h
  21 @@ -481,6 +481,145 @@ enum x86_intercept {
  22         nr_x86_intercepts
  23  };
  24
  25 +
  26 +/*
  27 + * 32 bit KVM's emulated SMM layout
  28 + * Loosely based on Intel's layout
  29 + */
  30 +
  31 +struct kvm_smm_seg_state_32 {
  32 +       u32 flags;
  33 +       u32 limit;
  34 +       u32 base;
  35 +} __packed;
  36 +
  37 +struct kvm_smram_state_32 {
  38 +
  39 +       u32 reserved1[62];                      /* FE00 - FEF7 */
  40 +       u32 smbase;                             /* FEF8 */
  41 +       u32 smm_revision;                       /* FEFC */
  42 +       u32 reserved2[5];                       /* FF00-FF13 */
  43 +       /* CR4 is not present in Intel/AMD SMRAM image*/
  44 +       u32 cr4;                                /* FF14 */
  45 +       u32 reserved3[5];                       /* FF18 */
  46 +
  47 +       /*
  48 +        * Segment state is not present/documented in the
  49 +        * Intel/AMD SMRAM image
  50 +        */
  51 +       struct kvm_smm_seg_state_32 ds;         /* FF2C */
  52 +       struct kvm_smm_seg_state_32 fs;         /* FF38 */
  53 +       struct kvm_smm_seg_state_32 gs;         /* FF44 */
  54 +       /* idtr has only base and limit*/
  55 +       struct kvm_smm_seg_state_32 idtr;       /* FF50 */
  56 +       struct kvm_smm_seg_state_32 tr;         /* FF5C */
  57 +       u32 reserved;                           /* FF68 */
  58 +       /* gdtr has only base and limit*/
  59 +       struct kvm_smm_seg_state_32 gdtr;       /* FF6C */
  60 +       struct kvm_smm_seg_state_32 ldtr;       /* FF78 */
  61 +       struct kvm_smm_seg_state_32 es;         /* FF84 */
  62 +       struct kvm_smm_seg_state_32 cs;         /* FF90 */
  63 +       struct kvm_smm_seg_state_32 ss;         /* FF9C */
  64 +
  65 +       u32 es_sel;                             /* FFA8 */
  66 +       u32 cs_sel;                             /* FFAC */
  67 +       u32 ss_sel;                             /* FFB0 */
  68 +       u32 ds_sel;                             /* FFB4 */
  69 +       u32 fs_sel;                             /* FFB8 */
  70 +       u32 gs_sel;                             /* FFBC */
  71 +       u32 ldtr_sel;                           /* FFC0 */
  72 +       u32 tr_sel;                             /* FFC4 */
  73 +
  74 +       u32 dr7;                                /* FFC8 */
  75 +       u32 dr6;                                /* FFCC */
  76 +
  77 +       /* GPRS in the "natural" X86 order (RAX/RCX/RDX.../RDI)*/
  78 +       u32 gprs[8];                            /* FFD0-FFEC */
  79 +
  80 +       u32 eip;                                /* FFF0 */
  81 +       u32 eflags;                             /* FFF4 */
  82 +       u32 cr3;                                /* FFF8 */
  83 +       u32 cr0;                                /* FFFC */
  84 +} __packed;
  85 +
  86 +/*
  87 + * 64 bit KVM's emulated SMM layout
  88 + * Based on AMD64 layout
  89 + */
  90 +
  91 +struct kvm_smm_seg_state_64 {
  92 +       u16 selector;
  93 +       u16 attributes;
  94 +       u32 limit;
  95 +       u64 base;
  96 +};
  97 +
  98 +struct kvm_smram_state_64 {
  99 +       struct kvm_smm_seg_state_64 es;         /* FE00 (R/O) */
 100 +       struct kvm_smm_seg_state_64 cs;         /* FE10 (R/O) */
 101 +       struct kvm_smm_seg_state_64 ss;         /* FE20 (R/O) */
 102 +       struct kvm_smm_seg_state_64 ds;         /* FE30 (R/O) */
 103 +       struct kvm_smm_seg_state_64 fs;         /* FE40 (R/O) */
 104 +       struct kvm_smm_seg_state_64 gs;         /* FE50 (R/O) */
 105 +
 106 +       /* gdtr has only base and limit*/
 107 +       struct kvm_smm_seg_state_64 gdtr;       /* FE60 (R/O) */
 108 +       struct kvm_smm_seg_state_64 ldtr;       /* FE70 (R/O) */
 109 +
 110 +       /* idtr has only base and limit*/
 111 +       struct kvm_smm_seg_state_64 idtr;       /* FE80 (R/O) */
 112 +       struct kvm_smm_seg_state_64 tr;         /* FE90 (R/O) */
 113 +
 114 +       /* I/O restart and auto halt restart are not implemented by KVM */
 115 +       u64 io_restart_rip;                     /* FEA0 (R/O) */
 116 +       u64 io_restart_rcx;                     /* FEA8 (R/O) */
 117 +       u64 io_restart_rsi;                     /* FEB0 (R/O) */
 118 +       u64 io_restart_rdi;                     /* FEB8 (R/O) */
 119 +       u32 io_restart_dword;                   /* FEC0 (R/O) */
 120 +       u32 reserved1;                          /* FEC4 */
 121 +       u8 io_instruction_restart;              /* FEC8 (R/W) */
 122 +       u8 auto_halt_restart;                   /* FEC9 (R/W) */
 123 +       u8 reserved2[6];                        /* FECA-FECF */
 124 +
 125 +       u64 efer;                               /* FED0 (R/O) */
 126 +
 127 +       /*
 128 +        * Implemented on AMD only, to store current SVM guest address.
 129 +        * svm_guest_virtual_int has unknown purpose, not implemented.
 130 +        */
 131 +
 132 +       u64 svm_guest_flag;                     /* FED8 (R/O) */
 133 +       u64 svm_guest_vmcb_gpa;                 /* FEE0 (R/O) */
 134 +       u64 svm_guest_virtual_int;              /* FEE8 (R/O) */
 135 +
 136 +       u32 reserved3[3];                       /* FEF0-FEFB */
 137 +       u32 smm_revison;                        /* FEFC (R/O) */
 138 +       u32 smbase;                             /* FFF0 (R/W) */
 139 +       u32 reserved4[5];                       /* FF04-FF17 */
 140 +
 141 +       /* SSP and SVM fields below are not implemented by KVM */
 142 +       u64 ssp;                                /* FF18 (R/W) */
 143 +       u64 svm_guest_pat;                      /* FF20 (R/O) */
 144 +       u64 svm_host_efer;                      /* FF28 (R/O) */
 145 +       u64 svm_host_cr4;                       /* FF30 (R/O) */
 146 +       u64 svm_host_cr3;                       /* FF38 (R/O) */
 147 +       u64 svm_host_cr0;                       /* FF40 (R/O) */
 148 +
 149 +       u64 cr4;                                /* FF48 (R/O) */
 150 +       u64 cr3;                                /* FF50 (R/O) */
 151 +       u64 cr0;                                /* FF58 (R/O) */
 152 +
 153 +       u64 dr7;                                /* FF60 (R/O) */
 154 +       u64 dr6;                                /* FF68 (R/O) */
 155 +
 156 +       u64 rflags;                             /* FF70 (R/W) */
 157 +       u64 rip;                                /* FF78 (R/W) */
 158 +
 159 +       /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
 160 +       u64 gprs[16];                           /* FF80-FFFF (R/W) */
 161 +};
 162 +
 163 +
 164  /* Host execution mode. */
 165  #if defined(CONFIG_X86_32)
 166  #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32