From: Jason Gunthorpe <jgg@ziepe.ca>
To: Alex Mastro <amastro@fb.com>
Cc: Mostafa Saleh <smostafa@google.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
Keith Busch <kbusch@kernel.org>,
Alex Williamson <alex.williamson@redhat.com>,
Bjorn Helgaas <bhelgaas@google.com>,
David Reiss <dreiss@meta.com>, Joerg Roedel <joro@8bytes.org>,
Leon Romanovsky <leon@kernel.org>,
Li Zhe <lizhe.67@bytedance.com>,
Mahmoud Adam <mngyadam@amazon.de>,
Philipp Stanner <pstanner@redhat.com>,
Robin Murphy <robin.murphy@arm.com>,
"Kasireddy, Vivek" <vivek.kasireddy@intel.com>,
Will Deacon <will@kernel.org>, Yunxiang Li <Yunxiang.Li@amd.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [TECH TOPIC] vfio, iommufd: Enabling user space drivers to vend more granular access to client processes
Date: Mon, 22 Sep 2025 14:51:20 -0300 [thread overview]
Message-ID: <20250922175120.GA2547959@ziepe.ca> (raw)
In-Reply-To: <20250922174630.3123741-1-amastro@fb.com>
On Mon, Sep 22, 2025 at 10:46:23AM -0700, Alex Mastro wrote:
> Following a dma_buf_ops.mmap, I suppose that revocation would mean:
I'd investigate adding some ioctl to the dmabuf fd to permanently
revoke it. The zapping/etc already has to be done just to get mmap in
the first place. The vending process would retain a FD on the dmabuf
and when it is time to revoke it then it can call the ioctl directly
on the fd to revoke.
Jason
next prev parent reply other threads:[~2025-09-22 17:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 21:44 [TECH TOPIC] vfio, iommufd: Enabling user space drivers to vend more granular access to client processes Alex Mastro
2025-09-18 22:57 ` Jason Gunthorpe
2025-09-18 23:24 ` Keith Busch
2025-09-19 7:00 ` Tian, Kevin
2025-09-19 11:58 ` Jason Gunthorpe
2025-09-22 9:14 ` Mostafa Saleh
2025-09-22 17:46 ` Alex Mastro
2025-09-22 17:51 ` Jason Gunthorpe [this message]
2025-09-19 11:56 ` Jason Gunthorpe
2025-09-19 15:57 ` Alex Williamson
2025-09-19 17:14 ` Alex Mastro
2025-09-19 16:13 ` Alex Mastro
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