On Fri, Jan 05, 2018 at 02:58:57AM -0500, Michael Shell wrote:
>
> Most interesting, but also scary. Here's my own summary take on the info
> which I found at:
>
[ snipping - people can, and should, follow the links in your original
post, but I've got a question on one item ]
>
> There is, however, conflicting information when it comes to the AMD
> (Zen/Ryzen) CPUs and variant 2:
> https://www.realworldtech.com/forum/?threadid=173741&curpostid=173810
>
> Suse and Red Hat have released a firmware/microcode update for the AMD 17h
> family (Zen). This new firmware claims to
>
> " This new firmware disables branch prediction on AMD family 17h processor.
>
Does anybody have a link for (any) updated AMD firmware ? Ryzen is
model 17h, AFAICS linux firmware has nothing for that, and the
firmware for earlier models has not been updated in a long time.
> Also the CPU microcode for Intel Haswell-X, Skylake-X and Broadwell-X
> chipsets was updated to report both branch prediction control via CPUID
> flag and ability to control branch prediction via an MSR register.
> "
Ah, the high-end -X CPUs. I'm still hopeful of seeing new intel
firmware, but the last comment I read on lkml last night was that it
had not been released yet.
I looked at RedHat updates, they are still using microcode_ctl and
the date of that was not recent.
ĸen
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