linux-kernel - Re: [RFC PATCH 1/3] content: Add VIRTIO_F_SWIOTLB to negotiate use of SWIOTLB bounce buffers

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Message-ID: <f32b0dbd8d92b0ac0a33dcd586521ba180004952.camel@infradead.org>
Date: Thu, 03 Apr 2025 08:24:42 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Zhu Lingshan <lingshan.zhu@....com>, virtio-comment@...ts.linux.dev
Cc: mst@...hat.com, hch@...radead.org, Claire Chang <tientzu@...omium.org>, 
 linux-devicetree <devicetree@...r.kernel.org>, Rob Herring
 <robh+dt@...nel.org>, Jörg Roedel <joro@...tes.org>,
 iommu@...ts.linux-foundation.org,  linux-kernel@...r.kernel.org,
 graf@...zon.de
Subject: Re: [RFC PATCH 1/3] content: Add VIRTIO_F_SWIOTLB to negotiate use
 of SWIOTLB bounce buffers

On Thu, 2025-04-03 at 15:13 +0800, Zhu Lingshan wrote:
> 
> Hello David
> 
> IMHO, if we need a bounce buffer, why not place it on the host memory?

As explained in the cover letter, this is designed for the case where
the device *cannot* easily access host memory.


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