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

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Message-ID: <4c956b03-d956-4f23-ad7e-f67286cf6b4a@linux.intel.com>
Date: Fri, 15 Aug 2025 17:23:33 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...dia.com>, Uladzislau Rezki <urezki@...il.com>
Cc: baolu.lu@...ux.intel.com, Ethan Zhao <etzhao1900@...il.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 8/11/2025 8:55 PM, Jason Gunthorpe wrote:
> 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?

Fixed. Thanks!

Thanks,
baolu