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Call Depth Tracking For Less Costly Retbleed Mitigation Hopes To Land Soon

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  • Mangix
    replied
    I mean...even newer CPUs have these issues. They have not been fixed in hardware.

    Leave a comment:


  • dlq84
    replied
    Originally posted by Mangix View Post
    I thought these would be fixed in hardware.
    Like an Intel engineer coming home to your house and replacing your old CPU?

    Leave a comment:


  • Mangix
    replied
    I thought these would be fixed in hardware.

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  • JEBjames
    replied
    Michael

    Typo

    "mitigiation" should be "mitigation"

    Leave a comment:


  • Svyatko
    replied
    Originally posted by xcom View Post

    Will this be useful for Ryzen CPUs too?
    Yes.

    Originally posted by hotaru View Post

    Ryzen already has the "unret" mitigation as default with much lower performance impact than IBRS:
    It is insufficient: https://www.phoronix.com/news/AMD-Li...eed-STIBP-IBPB

    If opting for the more secure Indirect Branch Prediction Barrier "IBPB" mitigation that can mitigate short speculation windows on basic block boundaries too, rather than just the "unret" default, it now turns out a month later Single Thread Indirect Branch Predictors "STIBP" must also be enabled.

    Leave a comment:


  • hotaru
    replied
    Originally posted by xcom View Post
    Will this be useful for Ryzen CPUs too?
    Ryzen already has the "unret" mitigation as default with much lower performance impact than IBRS:

    Leave a comment:


  • xcom
    replied
    Will this be useful for Ryzen CPUs too?

    Leave a comment:


  • Call Depth Tracking For Less Costly Retbleed Mitigation Hopes To Land Soon

    Phoronix: Call Depth Tracking For Less Costly Retbleed Mitigation Hopes To Land Soon

    Longtime Linux kernel engineer Peter Zijlstra with Intel has sent out his latest "Call Depth Tracking" patches as a mitigiation for Retbleed that aims to be less costly on system performance than the current mitigation approach. With this latest patch series, he indicates he hopes to soon get this code mainlined...

    https://www.phoronix.com/news/Call-D...king-Hope-Soon
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