linux-kernel - Re: [PATCH v2 03/13] arm64: mm: Implicitly invalidate user ASID based on TLBI operation

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Message-ID: <20260127113130.00005395@huawei.com>
Date: Tue, 27 Jan 2026 11:31:30 +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 v2 03/13] arm64: mm: Implicitly invalidate user ASID
 based on TLBI operation

On Mon, 19 Jan 2026 17:21:50 +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>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>