About emulating SCSI and Vulnerabilities mitigation fixes


  1. Posts : 157
    Windows 10 Pro 20H2 x64
       #1

    About emulating SCSI and Vulnerabilities mitigation fixes


    I've been trying to emulate SCSI on Win10 1903 and it seems that Windows now blocks that type of thing.

    After a lot of researching I found a workaround to make this possible:

    Code:
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management] 
    "FeatureSettingsOverride"=dword:00020000 
    "FeatureSettingsOverrideMask"=dword:00020000

    But then I remember that this settings also controls the mitigation fixes of the CPUs.

    I've been searching for the meaning/consequences of those values but I haven't found anything.

    Does anyone knows what those values actually do??

    Thanks in advance.
      My Computer


  2. Posts : 11,206
    Windows / Linux : Arch Linux
       #2

    Hi there

    @eXtremeDevil

    buenas tardes -- wish I was in Spain today instead of cloudy day in Iceland (12 Deg) !!!


    emulating any sort of I/O is going to reduce performance -- whatever the OS itself does the actual hardware uses the Disk controller chip to actually read / write blocks of data from / to the actual physical disk controlled usually by BIOS / motherboard calls to the I/O controller in the hardware and sooner or later the emulation software will have to intercept the OS emulated hardware device and convert to real physical read / writes.

    This is often why when using VM's - especially para virtualized systems like VMWare / VBOX it's often better to try and pass RAW devices through in the file system for the OS in the Virtual machine rather than use the typical "Virtual disk" type of format. One of the biggest draw backs for large scale virtualisation has been the I/O subsystems -- with lean and mean OS'es like Esxi or even HYPER-V you can use the real hardware of the Virtualised OS with its drivers but this also comes at a cost of - especially in the case of HYPER-V of having the overhead of a full blown OS like Windows -- so "You pays your money -- and makes your choice".

    Any extra level of I/O emulation -- Bad idea IMO whether on a physical or a virtual machine.

    In over 30 years of using systems like Windows I've found the biggest drag on computer performance has been poor (and incredibly slow) Disks -- for typical users there's usually plenty of RAM / CPU power to do what they need. Obviously if they try and run 19 VM's on a 2GB Windows XP host with really slow HDD's with small cache sizes --then they know what to expect - but normally decent HDD's and better SSD's are usually good enough these days and the OS itself should provide adequate protection against malware etc.

    Cheers
    jimbo
      My Computer


  3. Posts : 157
    Windows 10 Pro 20H2 x64
    Thread Starter
       #3

    Thanks for the information, but, I want no know, does those values affect to the spectre mitigations?

    Thanks.
      My Computer


  4. Posts : 11,206
    Windows / Linux : Arch Linux
       #4

    eXtremeDevil said:
    Thanks for the information, but, I want no know, does those values affect to the spectre mitigations?

    Thanks.
    Sorry there -- can't give you that info as I've 100% no idea -- I was just mentioning that in general it's a very bad idea to mess around with the I/O subsystems on almost any type of computer and its OS.

    Cheers
    jimbo
      My Computer


  5. Posts : 157
    Windows 10 Pro 20H2 x64
    Thread Starter
       #5

    I think right now that's the only thing I can do, I'm trying to play my legit copy of GTA IV but it's a pain to insert the disc every time. I have a mini image but it seems that only mounting it with Alcohol does the trick
      My Computer


  6. Posts : 12,474
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #6

    I'm trying to play my legit copy of GTA IV but it's a pain to insert the disc every time
    There is an advantage for a couple of my clients needing constant access to a program to have a second disc drive in the computer [space permitting] and just leave the disc in it.
      My Computers


  7. Posts : 157
    Windows 10 Pro 20H2 x64
    Thread Starter
       #7

    May be a solution, but what if I want to change to EFLC every now and then? I'm gonna try and make a mini image myself in ISO format and see if mounting with Windows does the trick, but probably SecuROM will detect emulation or backup :S
      My Computer


 

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