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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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