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Re: [Xen-devel] [PATCH v1] x86/microcode: always collect_cpu_info() during boot


  • To: Jan Beulich <JBeulich@xxxxxxxx>, Chao Gao <chao.gao@xxxxxxxxx>
  • From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
  • Date: Mon, 1 Apr 2019 11:19:19 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Wei Liu <wei.liu2@xxxxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 01 Apr 2019 10:19:31 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 25/03/2019 17:08, Jan Beulich wrote:
>>>> On 25.03.19 at 12:12, <sergey.dyasli@xxxxxxxxxx> wrote:
>> Currently cpu_sig struct is not updated during boot when either:
>>
>>     1. ucode_scan is set to false (e.g. no "ucode=scan" in cmdline)
>>     2. initrd does not contain a microcode blob
> 
> What about "ucode=<number>"?

Yes, it's equally affected, I'll update the commit message.

>> These will result in cpu_sig.rev being 0 which affects APIC's
>> check_deadline_errata() and retpoline_safe() functions.
>>
>> Fix this by getting ucode revision early during boot and SMP bring up.
> 
> Can't you then drop the call from microcode_update_cpu()?

I tried this and found that properly handling errors requires
a call to __microcode_fini_cpu(). But instead of doing all this
refactoring now, I'd prefer this patch to go on top of Chao's
series, which greatly simplifies things in "remove struct
ucode_cpu_info". Otherwise, most of my work here would be removed
by the next version of Chao's series.

Chao,
To help me with this decision, when can we expect a v7 of your
series?

Thanks,
Sergey

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