linux-kernel - Re: [PATCH v2 2/2] vfio/type1: Set IOMMU_MMIO in dma->prot for MMIO-backed addresses

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Message-ID: <20251107155704.GM1732817@nvidia.com>
Date: Fri, 7 Nov 2025 11:57:04 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Wei Wang <wei.w.wang@...mail.com>
Cc: "alex@...zbot.org" <alex@...zbot.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"thomas.lendacky@....com" <thomas.lendacky@....com>,
	"joro@...tes.org" <joro@...tes.org>,
	"kevin.tian@...el.com" <kevin.tian@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v2 2/2] vfio/type1: Set IOMMU_MMIO in dma->prot for
 MMIO-backed addresses

On Fri, Nov 07, 2025 at 03:49:17PM +0000, Wei Wang wrote:
>    > (are you aware of any real examples in use?)
>    > VM_IO should indicate MMIO, yes, but we don't actually check that in
>    > this type 1 path..

>    Is it because VFIO type1 didn’t need to check for MMIO before?
>    (not sure how this impacts this patch adding the VM_IO check for MMIO
>    :) )

Okay, but it still doesn't mean it has to be decrypted..

Jason