Re: [Xen-devel] [PATCH 13/15] x86/xstate: Add Hygon Dhyana support

[Pu Wen <puwen@xxxxxxxx>]

On 2018/12/28 6:41, Andrew Cooper wrote:
> On 20/12/2018 13:15, Pu Wen wrote:
>> The Hygon Dhyana CPU don't save/restore FDP/FIP/FOP unless an exception
>> is pending. So add support for it in the function xrstor.
> 
> Really?
> 
> Zen was the first AMD processor to fix this (mis)feature, and the Xen
> code doesn't appear to have caught up yet.
> 
> I'm putting together a series trying to fix this, and several other
> similar issues.

There is indeed a feature bit in the CPU spec to indicate that this
(mis)feature no longer exists. Also I read the value of the feature
bit on Hygon Dhyana platform and found out that it's 1.

So this patch is no needed and will be removed in next version.

Thx.

-- 
Regards,
Pu Wen

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