linux-kernel - Re: [PATCH] mm/hmm: Allow hmm_dma_map

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Message-ID: <aDCXcbKwTdG3w5ZW@infradead.org>
Date: Fri, 23 May 2025 08:42:41 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Daisuke Matsuda <dskmtsd@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>, linux-rdma@...r.kernel.org,
	linux-mm@...ck.org, leon@...nel.org, jgg@...pe.ca,
	akpm@...ux-foundation.org, jglisse@...hat.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	zyjzyj2000@...il.com
Subject: Re: [PATCH] mm/hmm: Allow hmm_dma_map_alloc() to tolerate NULL device

Thank you very much, but I know rxe very well.  And given your apparent
knowledge of the rdma subsystem you should also know pretty well that
it does not otherwise call into the dma mapping core for virtual devices
because calling into the dma mapping code is not valid for the virtual
devices.

Please fix the rdma core to not call into the hmm dma mapping helpers
for the ib_uses_virt_dma() case.