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Re: [Xen-devel] [PATCH v4 6/6] x86/microcode: Synchronize late microcode loading

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.


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