[LEDE-DEV] [OpenWrt-Devel] [PATCH 0/5] x86: add support for microcode update

[Hauke Mehrtens]

On 01/18/2018 11:41 PM, Zoltan HERPAI wrote:
> 
> 
> On Thu, 18 Jan 2018, Hauke Mehrtens wrote:
> 
>> On 01/18/2018 01:51 PM, Nick Lowe wrote:
>>> Does an update to the Kernel, 4.9.77 and 4.14.14 need to be made to
>>> properly address this? There are fixes to mitigate Spectre.
>>
>> We even need a patch for GCC which will be in GCC 8 and 7.3.
>> For master we should backport it to GCC 5.5, but what do we want to do
>> with 17.01 and 15.05 ?
> 
> I'll speak only of CC - there is no microcode updater in it at all, so
> while 3.18 contains partial patches and GCC 4.8 is unlikely to get
> fixed, we should add this facility into it anyway.

I am fine with your solution when we do not fix all possible problems as
it is hard to exploit it anyway and most processes are anyway running as
root.

>> The AMD microcoded updater needs at least kernel 4.15, 4.14.13, 4.9.76,
>> 4.4.111  which we already have.
> 
> That's only for the fam17h (Zen) CPUs, earlier CPU types should work
> with earlier kernels, and this can likely be backported into 3.18. (I
> don't have a Zen-based box to test, hands up whoever has one.)

Hauke