linux-kernel - Re: AMD EPYC microcode update bug?

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Message-ID: <CAEJqkggKwp09nZB8E-VrDQH_giUBiJnn23NGFCXZW2X+NOaaBg@mail.gmail.com>
Date:   Wed, 10 Jan 2018 00:06:44 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: AMD EPYC microcode update bug?

2018-01-09 23:47 GMT+01:00 Tom Lendacky <thomas.lendacky@....com>:
> On 1/9/2018 4:28 PM, Gabriel C wrote:
>> Hello ,
>>
>> I'm testing an EPYC system right now with 2 EPYC 7281 16-Core Processors.
>>
>> I'm on 4.15.0-rc7 and tested an update to microcode_amd_fam17h.bin.
>>
>> First run was made by using the early microcode option with dracut[1]
>> so loading from a initrd. the driver reported 63 updated CPUs while CPU0
>> got still old microcode.
>
> I'm guessing that memory encryption is enabled, correct?  I've submitted a
> patch series to perform early initrd decryption for just this problem. I'm
> incorporating some minor feedback and getting ready to submit the next
> version.

Yes is correct I use mem_encrypt=on and SMT on in BIOS.

Can you give me an link to the patch series ?

>
> In the meantime, if you specify mem_encrypt=off on the kernel command line
> it should show CPU0 updated properly (with mem_encrypt=on and SMT enabled,
> I believe it really does get updated when the sibling hread is updated -
> do a rdmsr of 0x0000008b to verify).
>

I give that an test in a bit , the box is running now some test for a
different EPYC issue :)

( https://community.amd.com/thread/224000 )

Regards,

Gabriel C