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Re: [PATCH v2 0/7] Nesting support for lazy MMU mode
- To: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
- From: Kevin Brodsky <kevin.brodsky@xxxxxxx>
- Date: Tue, 9 Sep 2025 11:10:34 +0200
- Cc: linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, Andreas Larsson <andreas@xxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ryan Roberts <ryan.roberts@xxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Yeoreum Yun <yeoreum.yun@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 09 Sep 2025 09:11:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/09/2025 18:56, Lorenzo Stoakes wrote:
> On Mon, Sep 08, 2025 at 08:39:24AM +0100, Kevin Brodsky wrote:
>> When the lazy MMU mode was introduced eons ago, it wasn't made clear
>> whether such a sequence was legal:
>>
>> arch_enter_lazy_mmu_mode()
>> ...
>> arch_enter_lazy_mmu_mode()
>> ...
>> arch_leave_lazy_mmu_mode()
>> ...
>> arch_leave_lazy_mmu_mode()
>>
>> It seems fair to say that nested calls to
>> arch_{enter,leave}_lazy_mmu_mode() were not expected, and most
>> architectures never explicitly supported it.
>
> This is compiling with CONFIG_USERFAULTFD at all commits and series is
> compiling with allmodconfig plus all mm selftests are passing so from my
> side this looks good, thanks for addressing issues and rebasing! :)
Great thank you for that extensive testing, very appreciated! Shall I
add your Reviewed-by to the whole series?
- Kevin
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