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

[Pu Wen <puwen@xxxxxxxx>]

On 2019/4/3 0:15, Jan Beulich wrote:
> 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.
>>> One thing I don't see in this series is anything about microcode
>>> loading.  Presumably you'll follow the AMD patchloading mechanism, with
>>> a blob you provide yourself?
>> 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.

It's reasonable. But I'll not put the microcode loading patch in this
series, and will sent it individually later after sufficiently tested.
Or just add Hygon vendor checking to follow the AMD patchloading
mechanism right now and do the adjustment for Hygon if needed in the
future?

-- 
Regards,
Pu Wen

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