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Date: Wed, 20 May 2026 10:02:59 -0700
From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: <linux-kernel@vger.kernel.org>, "iommu@lists.linux.dev"
 <iommu@lists.linux.dev>, Jason Gunthorpe <jgg@nvidia.com>, Alex Williamson
 <alex@shazbot.org>, Joerg Roedel <joro@8bytes.org>, Mostafa Saleh
 <smostafa@google.com>, David Matlack <dmatlack@google.com>, Robin Murphy
 <robin.murphy@arm.com>, Nicolin Chen <nicolinc@nvidia.com>, "Tian, Kevin"
 <kevin.tian@intel.com>, Saurabh Sengar <ssengar@linux.microsoft.com>,
 <skhawaja@google.com>, <pasha.tatashin@soleen.com>, Will Deacon
 <will@kernel.org>, Baolu Lu <baolu.lu@linux.intel.com>,
 jacob.pan@linux.microsoft.com
Subject: Re: [PATCH v5 5/9] iommufd: Add an ioctl to query PA from IOVA for
 noiommu mode
Message-ID: <20260520100259.00004262@linux.microsoft.com>
In-Reply-To: <a0e88436-3bcd-4808-8aa8-86b3ec0c197a@intel.com>
References: <20260511184116.3687392-1-jacob.pan@linux.microsoft.com>
	<20260511184116.3687392-6-jacob.pan@linux.microsoft.com>
	<a0e88436-3bcd-4808-8aa8-86b3ec0c197a@intel.com>
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Hi Yi,

On Wed, 20 May 2026 15:20:15 +0800
Yi Liu <yi.l.liu@intel.com> wrote:

> From: Yi Liu <yi.l.liu@intel.com>
> To: Jacob Pan <jacob.pan@linux.microsoft.com>,
> <linux-kernel@vger.kernel.org>,  "iommu@lists.linux.dev"
> <iommu@lists.linux.dev>, Jason Gunthorpe  <jgg@nvidia.com>, Alex
> Williamson <alex@shazbot.org>, Joerg Roedel  <joro@8bytes.org>,
> Mostafa Saleh <smostafa@google.com>, David Matlack
> <dmatlack@google.com>, Robin Murphy <robin.murphy@arm.com>, Nicolin
> Chen  <nicolinc@nvidia.com>, "Tian, Kevin" <kevin.tian@intel.com> CC:
> Saurabh Sengar <ssengar@linux.microsoft.com>, <skhawaja@google.com>,
> <pasha.tatashin@soleen.com>, Will Deacon <will@kernel.org>, Baolu Lu
> <baolu.lu@linux.intel.com> Subject: Re: [PATCH v5 5/9] iommufd: Add
> an ioctl to query PA from IOVA for  noiommu mode Date: Wed, 20 May
> 2026 15:20:15 +0800 User-Agent: Mozilla Thunderbird
> 
> On 5/12/26 02:41, Jacob Pan wrote:
> > To support no-IOMMU mode where userspace drivers perform unsafe DMA
> > using physical addresses, introduce a new API to retrieve the
> > physical address of a user-allocated DMA buffer that has been
> > mapped to an IOVA via IOAS. The mapping is backed by SW-only I/O
> > page tables maintained by the generic IOMMUPT framework.
> > 
> > Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>  
> 
> since this patch is under your ahtuorship, maybe Jason's s-o-b should
> be prefixed with a c-d-b tag.
Missed this before, yeah, will do
 Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
 Co-developed-by: Jason Gunthorpe <jgg@nvidia.com>
 Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
 Signed-off-by: Jacob Pan <jacob.pan@linux.microsoft.com>