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Re: [Xen-devel] [PATCH v4 6/6] x86/microcode: Synchronize late microcode loading
- To: Chao Gao <chao.gao@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 15 Jan 2019 15:24:31 +0000
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Ashok Raj <ashok.raj@xxxxxxxxx>
- Delivery-date: Tue, 15 Jan 2019 15:26:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 30/11/2018 09:01, Chao Gao wrote:
> On Thu, Nov 29, 2018 at 10:56:53AM +0100, Roger Pau Monné wrote:
>> On Thu, Nov 29, 2018 at 12:43:25PM +0800, Chao Gao wrote:
>>> On Wed, Nov 28, 2018 at 04:22:09PM +0100, Roger Pau Monné wrote:
>>>> On Wed, Nov 28, 2018 at 01:34:16PM +0800, Chao Gao wrote:
>>>>> This patch ports microcode improvement patches from linux kernel.
>>>>>
>>>>> Before you read any further: the early loading method is still the
>>>>> preferred one and you should always do that. The following patch is
>>>>> improving the late loading mechanism for long running jobs and cloud use
>>>>> cases.
>>>>>
>>>>> Gather all cores and serialize the microcode update on them by doing it
>>>>> one-by-one to make the late update process as reliable as possible and
>>>>> avoid potential issues caused by the microcode update.
>>>>>
>>>>> Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
>>>>> Tested-by: Chao Gao <chao.gao@xxxxxxxxx>
>>>>> [linux commit: a5321aec6412b20b5ad15db2d6b916c05349dbff]
>>>>> [linux commit: bb8c13d61a629276a162c1d2b1a20a815cbcfbb7]
>>>> If this patch is the squash of two Linux commits, please post the
>>>> ported versions of the two commits separately.
>>> I don't understand this one.
>> You reference two Linux commits above, why is this done?
>>
>> I assume this is because you are porting two Linux commits to Xen, in
>> which case I think that should be done in two different patches, or a
>> note needs to be added to why you merge two Linux commits into a
>> single Xen patch.
> The latter fixed a severe bug introduced the first one. Maybe I need
> to add a note to clarify this.
That is fine. Given that there is a large divergence between the Linux
and Xen code, I would recommend not trying to port the Linux changes
patch for patch.
This patch is fine in this form, IMO.
~Andrew
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