Windows Client Guidance against speculative execution vulnerabilities

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  1. Posts : 1,116
    win 10 pro x64 os build 20H2
       #580

    yeah i here you all my Kid just bought a HP Envy laptop from Best Buy for collage , i did the latest Bios that said it had security fixes, low and behold it was it seems only for Meltdown, nothing in it for Spectre i have my feelings that it was not even for meltdown and that was done by windows like on our systems, it makes me wonder is HP and amd going to fix this or do they think they are still impervious to it.
      My Computer


  2. Posts : 2,557
    Windows 10 pro x64-bit
       #581

    Ground Sloth said:
    If you get the patch from the Microsoft Update Catalog, then Windows will load the microcode update into CPU memory on startup instead of the BIOS/UEFI. That's the only difference.
    Good to know. Thanks for your input.
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  3. Posts : 2,826
    Windows 10 Pro X64
       #582

    Hi,

    Actually it's just an emulation and that KB from MUC will only work on FCU (1709) and nothing else.

    Cheers,
      My Computers


  4. Posts : 2,557
    Windows 10 pro x64-bit
       #583

    fdegrove said:
    Hi,

    Actually it's just an emulation and that KB from MUC will only work on FCU (1709) and nothing else.

    Cheers,
    One would be hard pressed to think otherwise. Thanks also for your input. Always there at the right time...:)
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  5. Posts : 345
    Windows 10
       #584

    fdegrove said:
    Hi,

    Actually it's just an emulation and that KB from MUC will only work on FCU (1709) and nothing else.

    Cheers,

    No actual microcode is being loaded into CPU memory on startup?
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  6. Posts : 2,826
    Windows 10 Pro X64
       #585

    Hi,

    Ground Sloth said:
    No actual microcode is being loaded into CPU memory on startup?
    Not that I know of, no. Besides what CPU memory would that be ? There's only a number of cacheing memory blocks, right ?

    Cheers,
      My Computers


  7. Posts : 345
    Windows 10
       #586

    fdegrove said:
    Hi,



    Not that I know of, no. Besides what CPU memory would that be ? There's only a number of cacheing memory blocks, right ?

    Cheers,

    I thought it's loaded into the same area of volatile memory on the CPU where the BIOS/UEFI loads the microcode update. I asked you about a month ago if Windows loads the microcode update into CPU memory, and you said that it does.

    KB4090007 Intel microcode Cumulative Update for Windows 10 v1709 - Page 4 - Windows 10 Forums
    Last edited by Ground Sloth; 09 Apr 2018 at 10:02.
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  8. Posts : 2,826
    Windows 10 Pro X64
       #587

    Hi,

    I asked you about a month ago if Windows loads the microcode update into CPU memory, and you said that it does.
    I wasn't sure what exactly it was you meant by "CPU memory" at the time but assumed you meant DRAM memory in general.
    The way the emulation works there's no need to acces the CPU's hardware, it makes the OS believe the MC is what is presented by the software patch which is only active for as long as the OS is active.

    MC is CPU firmware so it's not something that resides in volatile memory.

    Cheers,
      My Computers


  9. Posts : 345
    Windows 10
       #588

    The BIOS/UEFI updates the CPU microcode by loading the update into volatile memory on the CPU during boot. I thought Windows essentially did the same thing during startup. Thanks for clarifying.
      My Computer


  10. Posts : 2,826
    Windows 10 Pro X64
       #589

    Hi,

    The BIOS/UEFI updates the CPU microcode by loading the update into volatile memory on the CPU during boot.
    MC is a software interpretation layer that sits between the cpu's firmware and the computer system as a whole and resides in the cpu's non-volatile memory. Once it's updated it stays that way untill the next update etc.
    In a way it can be viewed as a piece of software that talks to the cpu telling it how to "read" and "execute" instructions coming from the system.

    Cheers,
      My Computers


 

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