Hi Cédric, > -----Original Message----- > From: Cédric Le Goater <[email protected]> > Sent: 17 December 2025 17:02 > To: Nicolin Chen <[email protected]>; Leon Romanovsky <[email protected]> > Cc: Bjorn Helgaas <[email protected]>; Logan Gunthorpe > <[email protected]>; Jens Axboe <[email protected]>; Robin Murphy > <[email protected]>; Joerg Roedel <[email protected]>; Will Deacon > <[email protected]>; Marek Szyprowski <[email protected]>; Jason > Gunthorpe <[email protected]>; Andrew Morton <[email protected]>; > Jonathan Corbet <[email protected]>; Sumit Semwal > <[email protected]>; Christian König <[email protected]>; > Alex Williamson <[email protected]>; Kees Cook > <[email protected]>; Gustavo A. R. Silva <[email protected]>; Ankit > Agrawal <[email protected]>; Yishai Hadas <[email protected]>; Shameer > Kolothum <[email protected]>; Kevin Tian <[email protected]>; > Krishnakant Jaju <[email protected]>; Matt Ochs <[email protected]>; > [email protected]; [email protected]; linux- > [email protected]; [email protected]; [email protected]; linux- > [email protected]; [email protected]; dri- > [email protected]; [email protected]; > [email protected]; [email protected]; Vivek Kasireddy > <[email protected]> > Subject: Re: [PATCH v6 00/11] vfio/pci: Allow MMIO regions to be exported > through dma-buf > > External email: Use caution opening links or attachments > > > Hello Nicolin, > > On 11/4/25 20:19, Nicolin Chen wrote: > > On Sun, Nov 02, 2025 at 10:00:48AM +0200, Leon Romanovsky wrote: > >> Changelog: > >> v6: > >> * Fixed wrong error check from pcim_p2pdma_init(). > >> * Documented pcim_p2pdma_provider() function. > >> * Improved commit messages. > >> * Added VFIO DMA-BUF selftest. > >> * Added __counted_by(nr_ranges) annotation to struct > vfio_device_feature_dma_buf. > >> * Fixed error unwind when dma_buf_fd() fails. > >> * Document latest changes to p2pmem. > >> * Removed EXPORT_SYMBOL_GPL from pci_p2pdma_map_type. > >> * Moved DMA mapping logic to DMA-BUF. > >> * Removed types patch to avoid dependencies between subsystems. > >> * Moved vfio_pci_dma_buf_move() in err_undo block. > >> * Added nvgrace patch. > > > > I have verified this v6 using Jason's iommufd dmabuf branch: > > https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf/ > > > > by drafting a QEMU patch on top of Shameer's vSMMU v5 series: > > https://github.com/nicolinc/qemu/commits/wip/iommufd_dmabuf/ > > > > with that, I see GPU BAR memory be correctly fetched in the QEMU: > > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 0", > > offset: 0x0, size: 0x1000000 vfio_region_dmabuf Device 0009:01:00.0, > > region "0009:01:00.0 BAR 2", offset: 0x0, size: 0x44f00000 > > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 4", > > offset: 0x0, size: 0x17a0000000 > > > > Tested-by: Nicolin Chen <[email protected]> > > Do you plan to provide P2P support with IOMMUFD for QEMU ?
Yes. We do plan to send that support patch soon. Thanks, Shameer
