typedef struct _SYSTEM_SPECULATION_CONTROL_INFORMATION
{
    struct
    {
        ULONG BpbEnabled : 1;   //  IBPB/IBRS protection enabled
        ULONG BpbDisabledSystemPolicy : 1;   //  PolicyOverride/PolicyOverrideMask registry setting
        ULONG BpbDisabledNoHardwareSupport : 1;   //  BIOS/Firmware update not installed (or does this mean AMD CPU?)
        ULONG SpecCtrlEnumerated : 1;   //  CPU SPEC_CTRL MSR support (IBRS)
        ULONG SpecCmdEnumerated : 1;   //  CPU PRED_CMD MSR support (IBPB)
        ULONG IbrsPresent : 1;   //  IBRS (Indirect Branch Restricted Speculation) support present (if SpecCtrlEnumerated)
        ULONG StibpPresent : 1;   //  STIBP (Single Thread Indirect Branch Predictors) support present (if SpecCtrlEnumerated)
        ULONG SmepPresent : 1;   //  SMEP (Supervisor-Mode Execution Prevention) support present (Ivy Bridge and later)
        ULONG Reserved : 24;   //
    } SpeculationControlFlags;
} SYSTEM_SPECULATION_CONTROL_INFORMATION, *PSYSTEM_SPECULATION_CONTROL_INFORMATION;

Notes:

IbrsPresent and StibpPresent: BIOS/Firmware update installed






#define SystemKernelVaShadowInformation     (SYSTEM_INFORMATION_CLASS)196
typedef struct _SYSTEM_KERNEL_VA_SHADOW_INFORMATION
{
    struct
    {
        ULONG KvaShadowEnabled : 1;   //  Kernel VA shadowing enabled
        ULONG KvaShadowUserGlobal : 1;   //  Kernel VA shadowing on user pages marked global
        ULONG KvaShadowPcid : 1;   //  CPU has PCID support (Westmere and later)
        ULONG KvaShadowInvpcid : 1;   //  CPU has NVPCID support -- (Haswell and later)
        ULONG Reserved : 28;   //
    } KvaShadowFlags;
} SYSTEM_KERNEL_VA_SHADOW_INFORMATION, *PSYSTEM_KERNEL_VA_SHADOW_INFORMATION;