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

[Toan Pham]

>> 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.

As far as I know, to properly mitigate spectre variant 2, it requires
update to microcode along w/ kernel support for IBRS.  However, IBRS
feature was just committed to the mainline on Jan 4th (ref.
https://lwn.net/Articles/743019/ ), so it is most likely not supported by
in other LTS branches yet.

Spectre variant 1 is a bigger headache because it requires recompilation of
linux kernel and all libraries w/ lfence feature.





On Fri, Jan 19, 2018 at 4:05 AM, Lucian Cristian <luci at createc.ro> wrote:

> On 19.01.2018 00:41, 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.
>>
>> 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.)
>>
>> Regards,
>> -w-
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>>
>
> I do have an R5 1600, but can't test until Monday night
>
>
> Regards
>
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