Mtf.h File Reference

Monitor Trap Flag Headers. More...

Go to the source code of this file.

Functions
VOID	MtfHandleVmexit (VIRTUAL_MACHINE_STATE *VCpu)
	Handle Monitor Trap Flag vm-exits.

Detailed Description

Monitor Trap Flag Headers.

Author

Sina Karvandi (sina@.nosp@m.hype.nosp@m.rdbg..nosp@m.org)

Version

0.1

Date

2021-01-27

Copyright

This project is released under the GNU Public License v3.

Function Documentation

MtfHandleVmexit()

VOID MtfHandleVmexit

(

VIRTUAL_MACHINE_STATE *

VCpu

)

Handle Monitor Trap Flag vm-exits.

Parameters

VCpu	The virtual processor's state

Returns

VOID

{
    BOOLEAN IsMtfHandled = FALSE;
 
    //
    // Redo the instruction
    //
    HvSuppressRipIncrement(VCpu);
 
    //
    // Explicitly say that we want to unset MTFs
    //
    VCpu->IgnoreMtfUnset = FALSE;
 
    //
    // Check for KD related MTFs
    //
    if (VmmCallbackHandleMtfCallback(VCpu->CoreId))
    {
        //
        // MTF is handled
        //
        IsMtfHandled = TRUE;
    }
 
    //
    // *** Regular Monitor Trap Flag functionalities ***
    //
    if (VCpu->MtfEptHookRestorePoint)
    {
        //
        // MTF is handled
        //
        IsMtfHandled = TRUE;
 
        //
        // Restore the previous state
        //
        EptHookHandleMonitorTrapFlag(VCpu);
 
        //
        // Set it to NULL
        //
        VCpu->MtfEptHookRestorePoint = NULL;
 
        //
        // Check for re-enabling external interrupts
        //
        HvEnableAndCheckForPreviousExternalInterrupts(VCpu);
    }
 
    //
    // Check for ignored MTFs
    //
    if (VCpu->IgnoreOneMtf)
    {
        //
        // MTF is handled
        //
        IsMtfHandled = TRUE;
 
        VCpu->IgnoreOneMtf = FALSE;
    }
 
    //
    // Check for possible unhandled MTFs to avoid setting unusable MTFs
    //
    if (!IsMtfHandled)
    {
        LogError("Err, why MTF occurred?!");
    }
 
    //
    // Final check to unset MTF
    //
    if (!VCpu->IgnoreMtfUnset)
    {
        //
        // We don't need MTF anymore if it set to disable MTF
        //
        HvSetMonitorTrapFlag(FALSE);
    }
    else
    {
        //
        // Set it to false to avoid future errors
        //
        VCpu->IgnoreMtfUnset = FALSE;
    }
}