Linaro-mm-sig June 2025

linaro-mm-sig@lists.linaro.org

15 participants
52 discussions

[PATCH 6.6 391/444] drm/gem: Internally test import_attach for imported objects

by Greg Kroah-Hartman

6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Zimmermann <tzimmermann(a)suse.de> commit 8260731ccad0451207b45844bb66eb161a209218 upstream. Test struct drm_gem_object.import_attach to detect imported objects. During object clenanup, the dma_buf field might be NULL. Testing it in an object's free callback then incorrectly does a cleanup as for native objects. Happens for calls to drm_mode_destroy_dumb_ioctl() that clears the dma_buf field in drm_gem_object_exported_dma_buf_free(). v3: - only test for import_attach (Boris) v2: - use import_attach.dmabuf instead of dma_buf (Christian) Signed-off-by: Thomas Zimmermann <tzimmermann(a)suse.de> Fixes: b57aa47d39e9 ("drm/gem: Test for imported GEM buffers with helper") Reported-by: Andy Yan <andyshrk(a)163.com> Closes: https://lore.kernel.org/dri-devel/38d09d34.4354.196379aa560.Coremail.andysh… Tested-by: Andy Yan <andyshrk(a)163.com> Cc: Thomas Zimmermann <tzimmermann(a)suse.de> Cc: Anusha Srivatsa <asrivats(a)redhat.com> Cc: Christian König <christian.koenig(a)amd.com> Cc: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Cc: Maxime Ripard <mripard(a)kernel.org> Cc: David Airlie <airlied(a)gmail.com> Cc: Simona Vetter <simona(a)ffwll.ch> Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: "Christian König" <christian.koenig(a)amd.com> Cc: dri-devel(a)lists.freedesktop.org Cc: linux-media(a)vger.kernel.org Cc: linaro-mm-sig(a)lists.linaro.org Reviewed-by: Boris Brezillon <boris.brezillon(a)collabora.com> Reviewed-by: Simona Vetter <simona.vetter(a)ffwll.ch> Link: https://lore.kernel.org/r/20250416065820.26076-1-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- include/drm/drm_gem.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -567,8 +567,7 @@ static inline bool drm_gem_object_is_sha */ static inline bool drm_gem_is_imported(const struct drm_gem_object *obj) { - /* The dma-buf's priv field points to the original GEM object. */ - return obj->dma_buf && (obj->dma_buf->priv != obj); + return !!obj->import_attach; } #ifdef CONFIG_LOCKDEP

1 year, 2 months

Re: [RFC PATCH 00/30] Host side (KVM/VFIO/IOMMUFD) support for TDISP using TSM

by Jason Gunthorpe

On Thu, May 29, 2025 at 01:34:43PM +0800, Xu Yilun wrote: > This series has 3 sections: I really think this is too big to try to progress, even in RFC form. > Patch 1 - 11 deal with the private MMIO mapping in KVM MMU via DMABUF. > Leverage Jason & Vivek's latest VFIO dmabuf series [3], see Patch 2 - 4. > The concern for get_pfn() kAPI [4] is not addressed so are marked as > HACK, will investigate later. I would probably split this out entirely into its own topic. It doesn't seem directly related to TSM as KVM can use DMABUF for good reasons independently . > Patch 12 - 22 is about TSM Bind/Unbind/Guest request management in VFIO > & IOMMUFD. Picks some of Shameer's patch in [5], see Patch 12 & 14. This is some reasonable topic on its own after Dan's series > Patch 23 - 30 is a solution to meet the TDX specific sequence > enforcement on various device Unbind cases, including converting device > back to shared, hot unplug, TD destroy. Start with a tdx_tsm driver > prototype and finally implement the Unbind enforcement inside the > driver. To be honest it is still awkward to me, but I need help. Then you have a series or two to implement TDX using the infrastructure. Jason

1 year, 2 months

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Linaro-mm-sig June 2025