Re: [PATCH 1/1] x86/mm: fix incomplete page-table invalidation with TCE

[Andrew Cooper]

On 05/10/2026 9:32 am, Lance Yang wrote:
>
>
> On 2026/10/5 16:19, Andrew Cooper wrote:
>> On 05/10/2026 8:29 am, Lance Yang wrote:
>>>>
>>>> Did you repro any bug related to this? The functionality is perhaps
>>>> underspecified in the AMD manual.
>>>
>>> TBH, I don't have a reproducer yet. Just LLM stumbled upon this while
>>> I was investigating another memory corruption issue [1].
>>>
>>> [1]
>>> https://lore.kernel.org/linux-mm/arY1Wq6R9OY20ans@xxxxxxxxxxxxxxxxx/#t
>>
>> What hardware are you running on?
>>
>> That looks like the Zen5 issue, for which you want either the latest
>> microcode out of linux-firmware and/or
>> https://lore.kernel.org/r/20261002211617.1001617-1-bp@xxxxxxxxxx
>>
>> TCE is a no-op in Zen1 and later, so unless you're on older hardware, it
>> won't be that.
>
> Just to clarify ... these are two separate issues.
>
> I mentioned [1] only to explain how this came up while investigating
> something else. I'm not claiming that TCE caused the corruption reported
> there :) 

Please can you answer the question.  Which CPU are you seeing this on?

~Andrew