Re: [Xen-devel] [PATCH v4 00/15] Add support for Hygon Dhyana Family 18h processor

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.04.19 at 18:00, <puwen@xxxxxxxx> wrote:
> On 2019/4/2 23:14, Andrew Cooper wrote:
>> On 30/03/2019 10:40, Pu Wen wrote:
>>> This patch series have been applied and tested successfully on Hygon
>>> Dhyana processor, also been tested on AMD EPYC (family 17h) processor.
>>> It works fine and makes no harm to the existing code.
>>>
>>> Reference:
>>> [1] 
> https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0Fh 
> .pdf
>> 
>> One thing I don't see in this series is anything about microcode
> 
> Right now Hygon load microcode in BIOS.
> 
>> loading.  Presumably you'll follow the AMD patchloading mechanism, with
>> a blob you provide yourself?
> 
> We are exploring the Hygon patchloading mechanism, which will employ 
> most of the functions of AMD's. We also try to make the Hygon microcode 
> blob be compatible with the AMD one.
> 
> When the Hygon patchloading mechanism is practicable and it's necessary 
> to load the Hygon microcode outside of BIOS, we'll send the patchloading 
> patches to Xen and Linux mailing lists.

I suppose both Intel and AMD had this same intention of ucode loading
being a firmware job only, and we see where we are right now. As long
as updated firmware does not become available in a timely manner (or
perhaps not at all, because of a vendor considering a certain system
EOL), there's going to be a need to be able to load it from the OS.

Jan



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