From: Leon Romanovsky <leon@kernel.org>
To: Keith Busch <kbusch@kernel.org>
Cc: Zhiping Zhang <zhipingz@meta.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-rdma@vger.kernel.org, linux-pci@vger.kernel.org,
netdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
Yochai Cohen <yochai@nvidia.com>,
Yishai Hadas <yishaih@nvidia.com>,
Bjorn Helgaas <helgaas@kernel.org>
Subject: Re: [RFC v2 1/2] vfio: add callback to get tph info for dmabuf
Date: Tue, 31 Mar 2026 22:02:20 +0300 [thread overview]
Message-ID: <20260331190220.GI814676@unreal> (raw)
In-Reply-To: <acvWplw67b3Gwlkc@kbusch-mbp>
On Tue, Mar 31, 2026 at 08:13:58AM -0600, Keith Busch wrote:
> On Tue, Mar 31, 2026 at 05:03:09PM +0300, Leon Romanovsky wrote:
> > I understand, my proposal is always set TPH flag when new struct is
> > used.
>
> An existing application recompiled against the new kernel api implicitly
> uses the new struct layout without setting the TPH flag, so kernel and
> application are out of sync on where dma_ranges exists with your
> proposal.
Right, what about adding TPH fields to struct vfio_region_dma_range
instead of struct vfio_device_feature_dma_buf?
Thanks
next prev parent reply other threads:[~2026-03-31 19:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 23:46 [RFC v2 0/2] Retrieve tph from dmabuf for PCIe P2P memory access Zhiping Zhang
2026-03-24 23:46 ` [RFC v2 1/2] vfio: add callback to get tph info for dmabuf Zhiping Zhang
2026-03-25 8:25 ` Leon Romanovsky
2026-03-26 22:41 ` Keith Busch
2026-03-26 22:55 ` Zhiping Zhang
2026-03-31 8:39 ` Leon Romanovsky
2026-03-31 8:37 ` Leon Romanovsky
2026-03-31 13:00 ` Keith Busch
2026-03-31 13:29 ` Leon Romanovsky
2026-03-31 13:35 ` Keith Busch
2026-03-31 14:03 ` Leon Romanovsky
2026-03-31 14:13 ` Keith Busch
2026-03-31 19:02 ` Leon Romanovsky [this message]
2026-03-31 19:44 ` Keith Busch
2026-04-09 12:04 ` Leon Romanovsky
2026-04-13 18:32 ` Zhiping Zhang
2026-04-13 19:23 ` Leon Romanovsky
2026-04-14 17:34 ` Keith Busch
2026-04-16 15:02 ` Leon Romanovsky
2026-03-28 2:21 ` fengchengwen
2026-03-31 0:49 ` Zhiping Zhang
2026-03-24 23:46 ` [RFC v2 2/2] RDMA/mlx5: get tph for p2p access when registering dmabuf mr Zhiping Zhang
2026-03-29 16:41 ` kernel test robot
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