From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Maxim Levitsky Date: Tue, 21 Jun 2022 18:08:58 +0300 Subject: [PATCH] KVM: x86: emulator/smm: add structs for KVM's smram layout Those structs will be used to read/write the smram state image. Also document the differences between KVM's SMRAM layout and SMRAM layout that is used by real Intel/AMD cpus. Signed-off-by: Maxim Levitsky Signed-off-by: Thomas Lamprecht --- arch/x86/kvm/kvm_emulate.h | 139 +++++++++++++++++++++++++++++++++++++ 1 file changed, 139 insertions(+) diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h index 8dff25d267b7..3bbf7c1c5b18 100644 --- a/arch/x86/kvm/kvm_emulate.h +++ b/arch/x86/kvm/kvm_emulate.h @@ -481,6 +481,145 @@ enum x86_intercept { nr_x86_intercepts }; + +/* + * 32 bit KVM's emulated SMM layout + * Loosely based on Intel's layout + */ + +struct kvm_smm_seg_state_32 { + u32 flags; + u32 limit; + u32 base; +} __packed; + +struct kvm_smram_state_32 { + + u32 reserved1[62]; /* FE00 - FEF7 */ + u32 smbase; /* FEF8 */ + u32 smm_revision; /* FEFC */ + u32 reserved2[5]; /* FF00-FF13 */ + /* CR4 is not present in Intel/AMD SMRAM image*/ + u32 cr4; /* FF14 */ + u32 reserved3[5]; /* FF18 */ + + /* + * Segment state is not present/documented in the + * Intel/AMD SMRAM image + */ + struct kvm_smm_seg_state_32 ds; /* FF2C */ + struct kvm_smm_seg_state_32 fs; /* FF38 */ + struct kvm_smm_seg_state_32 gs; /* FF44 */ + /* idtr has only base and limit*/ + struct kvm_smm_seg_state_32 idtr; /* FF50 */ + struct kvm_smm_seg_state_32 tr; /* FF5C */ + u32 reserved; /* FF68 */ + /* gdtr has only base and limit*/ + struct kvm_smm_seg_state_32 gdtr; /* FF6C */ + struct kvm_smm_seg_state_32 ldtr; /* FF78 */ + struct kvm_smm_seg_state_32 es; /* FF84 */ + struct kvm_smm_seg_state_32 cs; /* FF90 */ + struct kvm_smm_seg_state_32 ss; /* FF9C */ + + u32 es_sel; /* FFA8 */ + u32 cs_sel; /* FFAC */ + u32 ss_sel; /* FFB0 */ + u32 ds_sel; /* FFB4 */ + u32 fs_sel; /* FFB8 */ + u32 gs_sel; /* FFBC */ + u32 ldtr_sel; /* FFC0 */ + u32 tr_sel; /* FFC4 */ + + u32 dr7; /* FFC8 */ + u32 dr6; /* FFCC */ + + /* GPRS in the "natural" X86 order (RAX/RCX/RDX.../RDI)*/ + u32 gprs[8]; /* FFD0-FFEC */ + + u32 eip; /* FFF0 */ + u32 eflags; /* FFF4 */ + u32 cr3; /* FFF8 */ + u32 cr0; /* FFFC */ +} __packed; + +/* + * 64 bit KVM's emulated SMM layout + * Based on AMD64 layout + */ + +struct kvm_smm_seg_state_64 { + u16 selector; + u16 attributes; + u32 limit; + u64 base; +}; + +struct kvm_smram_state_64 { + struct kvm_smm_seg_state_64 es; /* FE00 (R/O) */ + struct kvm_smm_seg_state_64 cs; /* FE10 (R/O) */ + struct kvm_smm_seg_state_64 ss; /* FE20 (R/O) */ + struct kvm_smm_seg_state_64 ds; /* FE30 (R/O) */ + struct kvm_smm_seg_state_64 fs; /* FE40 (R/O) */ + struct kvm_smm_seg_state_64 gs; /* FE50 (R/O) */ + + /* gdtr has only base and limit*/ + struct kvm_smm_seg_state_64 gdtr; /* FE60 (R/O) */ + struct kvm_smm_seg_state_64 ldtr; /* FE70 (R/O) */ + + /* idtr has only base and limit*/ + struct kvm_smm_seg_state_64 idtr; /* FE80 (R/O) */ + struct kvm_smm_seg_state_64 tr; /* FE90 (R/O) */ + + /* I/O restart and auto halt restart are not implemented by KVM */ + u64 io_restart_rip; /* FEA0 (R/O) */ + u64 io_restart_rcx; /* FEA8 (R/O) */ + u64 io_restart_rsi; /* FEB0 (R/O) */ + u64 io_restart_rdi; /* FEB8 (R/O) */ + u32 io_restart_dword; /* FEC0 (R/O) */ + u32 reserved1; /* FEC4 */ + u8 io_instruction_restart; /* FEC8 (R/W) */ + u8 auto_halt_restart; /* FEC9 (R/W) */ + u8 reserved2[6]; /* FECA-FECF */ + + u64 efer; /* FED0 (R/O) */ + + /* + * Implemented on AMD only, to store current SVM guest address. + * svm_guest_virtual_int has unknown purpose, not implemented. + */ + + u64 svm_guest_flag; /* FED8 (R/O) */ + u64 svm_guest_vmcb_gpa; /* FEE0 (R/O) */ + u64 svm_guest_virtual_int; /* FEE8 (R/O) */ + + u32 reserved3[3]; /* FEF0-FEFB */ + u32 smm_revison; /* FEFC (R/O) */ + u32 smbase; /* FFF0 (R/W) */ + u32 reserved4[5]; /* FF04-FF17 */ + + /* SSP and SVM fields below are not implemented by KVM */ + u64 ssp; /* FF18 (R/W) */ + u64 svm_guest_pat; /* FF20 (R/O) */ + u64 svm_host_efer; /* FF28 (R/O) */ + u64 svm_host_cr4; /* FF30 (R/O) */ + u64 svm_host_cr3; /* FF38 (R/O) */ + u64 svm_host_cr0; /* FF40 (R/O) */ + + u64 cr4; /* FF48 (R/O) */ + u64 cr3; /* FF50 (R/O) */ + u64 cr0; /* FF58 (R/O) */ + + u64 dr7; /* FF60 (R/O) */ + u64 dr6; /* FF68 (R/O) */ + + u64 rflags; /* FF70 (R/W) */ + u64 rip; /* FF78 (R/W) */ + + /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */ + u64 gprs[16]; /* FF80-FFFF (R/W) */ +}; + + /* Host execution mode. */ #if defined(CONFIG_X86_32) #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32