[coreboot] When does AMD release the fam15 spectre microcode updates?

Taiidan at gmx.com Taiidan at gmx.com
Wed Apr 25 00:18:40 CEST 2018

On 04/17/2018 03:30 AM, Rudolf Marek wrote:

> Hi,
> I found new microcode here [1], I used cpu00610F01_ver0600111F_2018-03-05_AC55EB96.bin as a microcode for my Trinity family15h CPU.
> I hacked together a new microcode header which contains the equivalence table etc to be able to load this microcode into the CPU from Linux.
> dd if=/lib/firmware/amd-ucode/microcode_amd_fam15h.bin bs=1 count=84 of=header.bin
> cat header.bin cpu00610F01_ver0600111F_2018-03-05_AC55EB96.bin > microcode_amd_fam15h.bin
> copy the file to same location and trigger update:
> echo 1 >  /sys/devices/system/cpu/microcode/reload
> [ 6032.948243] microcode: CPU0: new patch_level=0x0600111f
> [ 6032.964913] microcode: CPU2: new patch_level=0x0600111f
> Please note that the header.bin does contain a size of the microcode blob, but it happens to be the same, so it works. Normally the container
> may contain more microcode blobs. But in my case I use just "right" one for my CPU.
> The new microcode seems to be adding the IBPB feature.
> Thanks
> Rudolf
> [1] https://github.com/platomav/CPUMicrocodes
This didn't work on my piledriver CPU's :[

When I try to "reload" nothing happens not even an error in dmesg....the
reload command has never worked for me no matter what system I use intel
or amd.

Thanks for helping.
I can't believe everyone else is so nonchalant about all this
considering how important it is I still haven't figured out how to
update the microcode on any of my computers - no guides I have found
actually work and no distros have the new microcode for intel or amd
despite it having been months.

For the best security one should have both the new microcode and the
lfence msr?

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