linux-kernel - Re: [PATCH v1 1/4] mm/hmm: HMM API for P2P DMA to device zone pages

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Message-ID: <ZxEc1HSBP2QuQLj4@infradead.org>
Date: Thu, 17 Oct 2024 07:19:00 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Christoph Hellwig <hch@...radead.org>,
	Yonatan Maman <ymaman@...dia.com>, nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	linux-mm@...ck.org, herbst@...hat.com, lyude@...hat.com,
	dakr@...hat.com, airlied@...il.com, simona@...ll.ch,
	leon@...nel.org, jglisse@...hat.com, akpm@...ux-foundation.org,
	dri-devel@...ts.freedesktop.org, apopple@...dia.com,
	bskeggs@...dia.com, Gal Shalom <GalShalom@...dia.com>
Subject: Re: [PATCH v1 1/4] mm/hmm: HMM API for P2P DMA to device zone pages

On Thu, Oct 17, 2024 at 11:05:07AM -0300, Jason Gunthorpe wrote:
> BTW this:
> 
>   iommu: generalize the batched sync after map interface
> 
> I am hoping to in a direction of adding a gather to the map, just like
> unmap. So eventually instead of open coding iotlb_sync_map() you'd
> flush the gather and it would do it.

I don't really care either way, I just need something to not regress
map behavior vs map_sg.