Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 25 Aug 2019 10:18:02 -0700 | Subject | Re: [GIT pull] x86/urgent for 5.3-rc5 |
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On Sun, Aug 25, 2019 at 2:45 AM Thomas Gleixner <tglx@linutronix.de> wrote: > > - Clear the RDRAND CPUID bit on AMD family 15h and 16h CPUs which are > affected by broken firmware which does not initialize RDRAND correctly > after resume. Add a command line parameter to override this for machine > which either do not use suspend/resume or have a fixed > BIOS. Unfortunately there is no way to detect this on boot, so the only > safe decision is to turn it off by default.
Not doing the Zen 2 boot-time case? Everybody assumes that all firmware has been fixed?
That one should be easy to verify since it happens at boot: just do "rdrand" twice, and if it returns all-ones both times, it's broken.
Linus
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