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.

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

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

Thanks.

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

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

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