Re: [PATCH v5 0/8] Fix stale IOTLB entries for kernel address space

[David Hildenbrand <david@redhat.com>]

On 08.10.25 21:42, Dave Hansen wrote:
> I wondered why no mm folks were commenting on this. linux-mm@ was cc'd,
> but the _people_ on cc seem to have been almost all IOMMU and x86 folks.
> so I added a few mm folks...

Thanks. Lately I find myself scanning linux-mm only randomly. So if it's 
not in my inbox, likely I won't realize easily that there is something 
that needs our attention.

Will take a look.

> 
> On 9/25/25 13:24, Dave Hansen wrote:
>> On 9/18/25 22:39, Lu Baolu wrote:
>>> This solution introduces a deferred freeing mechanism for kernel page
>>> table pages, which provides a safe window to notify the IOMMU to
>>> invalidate its caches before the page is reused.
>>
>> I think all the activity has died down and I everyone seems happy enough
>> with how this looks. Right?
>>
>> So is this something we should prod Andrew to take through the mm tree,
>> or is it x86-specific enough it should go through tip?
> 
> Hi Folks! We've got a bug fix here that has impact on x86, mm, and IOMMU
> code. I know I've talked with a few of you about this along the way, but
> it's really thin on mm reviews, probably because mm folks haven't been
> cc'd. Any eyeballs on it would be appreciated!
> 
> It seems like it should _probably_ go through the mm tree, although I'm
> happy to send it through tip if folks disagree.
> 
> Diffstat for reference:
> 
>   arch/x86/Kconfig              |  1 +
>   arch/x86/mm/init_64.c         |  2 +-
>   arch/x86/mm/pat/set_memory.c  |  2 +-
>   arch/x86/mm/pgtable.c         | 12 ++++-----
>   drivers/iommu/iommu-sva.c     | 29 +++++++++++++++++++++-
>   include/asm-generic/pgalloc.h | 18 ++++++++++++++
>   include/linux/iommu.h         |  4 +++
>   include/linux/mm.h            | 24 +++++++++++++++---
>   include/linux/page-flags.h    | 46 +++++++++++++++++++++++++++++++++++
>   mm/Kconfig                    |  3 +++
>   mm/pgtable-generic.c          | 39 +++++++++++++++++++++++++++++
>   11 files changed, 168 insertions(+), 12 deletions(-)
> 


-- 
Cheers

David / dhildenb