[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v2 0/7] Nesting support for lazy MMU mode
- To: Kevin Brodsky <kevin.brodsky@xxxxxxx>
- From: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
- Date: Mon, 8 Sep 2025 17:56:05 +0100
- Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none
- Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=hddoNg68YCWE3kyPD3LjrA/JuV3JBC1RzVFPhW5prWE=; b=LJEPZEX1XC/m7jncDboCIyHVwoNTEdD7/6ZossyXLKZo2NqNoT1wllB/qGpLqW2j3q/r83Eg9Dr24ljooTWGHMIrwGLS0uwiCY1Tzzk+nyk2y1In1XbZK0Lb9s+NcmpoZV/zlC3mm9UFXhYJdsafHzrfI/EHIDm06itazyy+17WJHKt/EbJplsnSZ1YfHxX41nZXAzILYvT3fuoV/yCPTdqaot/CLikAd0o4SSMWNhjBC4UKR3IrJzfX0oDnwpVkB1xQwl+aPnLNHf8/IGRNvKj32x7EIRdU28jAibb1ebxuiUCmwRl58jebt/cZPyXCQgDx4fF4KRbn57KCjt9dLw==
- Arc-seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=XlOiHnG53DYXYPjs4XZFIlBaJNrxCIoo2KpgP85/oGZ6wC9+q2gxovJTXS3PZeH/UIwkd5SDyoff0KaagX0qQNkEcSeG4h3Md7UAqFxFoaGAK4WINx9MoTQWoMmBb7nH5KU3uZ78OfJNlSyJF09sRl+XDZ9G/4etvto2jk6jvRZ3JnTggjn7HL6nO6onMGpPuhWk4i6CT9KDQHkLhAmTZXhuG++C3jPZ0ALiduj7Ktwcnxf2iMww/Lkujla8qaFE9yCzhZESs+Gk5hiyJIrGr53CZdt57eWipC6UQVlnjMoPiuaakTL5JXU9pBy86PO25ZJzWLqZk/g/vk8tttrpBQ==
- 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: Mon, 08 Sep 2025 16:57:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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! :)
Cheers, Lorenzo
|
