smm.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ASM_KVM_SMM_H
#define ASM_KVM_SMM_H
 
#include <linux/build_bug.h>
 
#ifdef CONFIG_KVM_SMM
 
 
/*
 * 32 bit KVM's emulated SMM layout. Based on Intel P6 layout
 * (https://www.sandpile.org/x86/smm.htm).
 */
 
struct kvm_smm_seg_state_32 {
    u32 flags;
    u32 limit;
    u32 base;
} __packed;
 
struct kvm_smram_state_32 {
    u32 reserved1[62];
    u32 smbase;
    u32 smm_revision;
    u16 io_inst_restart;
    u16 auto_hlt_restart;
    u32 io_restart_rdi;
    u32 io_restart_rcx;
    u32 io_restart_rsi;
    u32 io_restart_rip;
    u32 cr4;
 
    /* A20M#, CPL, shutdown and other reserved/undocumented fields */
    u16 reserved2;
    u8 int_shadow; /* KVM extension */
    u8 reserved3[17];
 
    struct kvm_smm_seg_state_32 ds;
    struct kvm_smm_seg_state_32 fs;
    struct kvm_smm_seg_state_32 gs;
    struct kvm_smm_seg_state_32 idtr; /* IDTR has only base and limit */
    struct kvm_smm_seg_state_32 tr;
    u32 reserved;
    struct kvm_smm_seg_state_32 gdtr; /* GDTR has only base and limit */
    struct kvm_smm_seg_state_32 ldtr;
    struct kvm_smm_seg_state_32 es;
    struct kvm_smm_seg_state_32 cs;
    struct kvm_smm_seg_state_32 ss;
 
    u32 es_sel;
    u32 cs_sel;
    u32 ss_sel;
    u32 ds_sel;
    u32 fs_sel;
    u32 gs_sel;
    u32 ldtr_sel;
    u32 tr_sel;
 
    u32 dr7;
    u32 dr6;
    u32 gprs[8]; /* GPRS in the "natural" X86 order (EAX/ECX/EDX.../EDI) */
    u32 eip;
    u32 eflags;
    u32 cr3;
    u32 cr0;
} __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;
    struct kvm_smm_seg_state_64 cs;
    struct kvm_smm_seg_state_64 ss;
    struct kvm_smm_seg_state_64 ds;
    struct kvm_smm_seg_state_64 fs;
    struct kvm_smm_seg_state_64 gs;
    struct kvm_smm_seg_state_64 gdtr; /* GDTR has only base and limit*/
    struct kvm_smm_seg_state_64 ldtr;
    struct kvm_smm_seg_state_64 idtr; /* IDTR has only base and limit*/
    struct kvm_smm_seg_state_64 tr;
 
    /* I/O restart and auto halt restart are not implemented by KVM */
    u64 io_restart_rip;
    u64 io_restart_rcx;
    u64 io_restart_rsi;
    u64 io_restart_rdi;
    u32 io_restart_dword;
    u32 reserved1;
    u8 io_inst_restart;
    u8 auto_hlt_restart;
    u8 amd_nmi_mask; /* Documented in AMD BKDG as NMI mask, not used by KVM */
    u8 int_shadow;
    u32 reserved2;
 
    u64 efer;
 
    /*
     * Two fields below are implemented on AMD only, to store
     * SVM guest vmcb address if the #SMI was received while in the guest mode.
     */
    u64 svm_guest_flag;
    u64 svm_guest_vmcb_gpa;
    u64 svm_guest_virtual_int; /* unknown purpose, not implemented */
 
    u32 reserved3[3];
    u32 smm_revison;
    u32 smbase;
    u32 reserved4[5];
 
    /* ssp and svm_* fields below are not implemented by KVM */
    u64 ssp;
    u64 svm_guest_pat;
    u64 svm_host_efer;
    u64 svm_host_cr4;
    u64 svm_host_cr3;
    u64 svm_host_cr0;
 
    u64 cr4;
    u64 cr3;
    u64 cr0;
    u64 dr7;
    u64 dr6;
    u64 rflags;
    u64 rip;
    u64 gprs[16]; /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
};
 
union kvm_smram {
    struct kvm_smram_state_64 smram64;
    struct kvm_smram_state_32 smram32;
    u8 bytes[512];
};
 
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
{
    kvm_make_request(KVM_REQ_SMI, vcpu);
    return 0;
}
 
static inline bool is_smm(struct kvm_vcpu *vcpu)
{
    return vcpu->arch.hflags & HF_SMM_MASK;
}
 
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
void enter_smm(struct kvm_vcpu *vcpu);
int emulator_leave_smm(struct x86_emulate_ctxt *ctxt);
void process_smi(struct kvm_vcpu *vcpu);
#else
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
 
/*
 * emulator_leave_smm is used as a function pointer, so the
 * stub is defined in x86.c.
 */
#endif
 
#endif