linux-kernel - Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB flush

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Message-ID: <20250811125559.GS184255@nvidia.com>
Date: Mon, 11 Aug 2025 09:55:59 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Uladzislau Rezki <urezki@...il.com>
Cc: Ethan Zhao <etzhao1900@...il.com>, Baolu Lu <baolu.lu@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, Jann Horn <jannh@...gle.com>,
	Vasant Hegde <vasant.hegde@....com>,
	Alistair Popple <apopple@...dia.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Andy Lutomirski <luto@...nel.org>, Yi Lai <yi1.lai@...el.com>,
	iommu@...ts.linux.dev, security@...nel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB
 flush

On Mon, Aug 11, 2025 at 11:15:58AM +0200, Uladzislau Rezki wrote:

> Agree, unless it is never considered as a hot path or something that can
> be really contented. It looks like you can use just a per-cpu llist to drain
> thinks.

I think we already largely agreed this was not a true fast path, I
don't think we need a per-cpu here.

But I would not make it extern unless there is a user?

Jason