linux-kernel - Re: [PATCH v1 03/13] arm64: mm: Implicitly invalidate user ASID based on TLBI operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251216180118.00005085@huawei.com>
Date: Tue, 16 Dec 2025 18:01:18 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Ryan Roberts <ryan.roberts@....com>
CC: Will Deacon <will@...nel.org>, Ard Biesheuvel <ardb@...nel.org>, "Catalin
 Marinas" <catalin.marinas@....com>, Mark Rutland <mark.rutland@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>, Oliver Upton
	<oliver.upton@...ux.dev>, Marc Zyngier <maz@...nel.org>, Dev Jain
	<dev.jain@....com>, Linu Cherian <Linu.Cherian@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 03/13] arm64: mm: Implicitly invalidate user ASID
 based on TLBI operation

On Tue, 16 Dec 2025 14:45:48 +0000
Ryan Roberts <ryan.roberts@....com> wrote:

> When kpti is enabled, separate ASIDs are used for userspace and
> kernelspace, requiring ASID-qualified TLB invalidation by virtual
> address to invalidate both of them.
> 
> Push the logic for invalidating the two ASIDs down into the low-level
> tlbi-op-specific functions and remove the burden from the caller to
> handle the kpti-specific behaviour.
> 
> Co-developed-by: Will Deacon <will@...nel.org>
> Signed-off-by: Will Deacon <will@...nel.org>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>  arch/arm64/include/asm/tlbflush.h | 27 ++++++++++-----------------
>  1 file changed, 10 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> index c5111d2afc66..31f43d953ce2 100644
> --- a/arch/arm64/include/asm/tlbflush.h
> +++ b/arch/arm64/include/asm/tlbflush.h

> +#undef __tlbi_user
>  #endif
> -
Hi Ryan,

It's trivial Tuesday so... Unrelated white space change.

>  #endif