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On Thu, Mar 05, 2026 at 01:36:40PM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri(a)nvidia.com>
>
> Current CC designs don't place a vIOMMU in front of untrusted devices.
> Instead, the DMA API forces all untrusted device DMA through swiotlb
> bounce buffers (is_swiotlb_force_bounce()) which copies data into
> decrypted memory on behalf of the device.
>
> When a caller has already arranged for the memory to be decrypted
> via set_memory_decrypted(), the DMA API needs to know so it can map
> directly using the unencrypted physical address rather than bounce
> buffering. Following the pattern of DMA_ATTR_MMIO, add
> DMA_ATTR_CC_DECRYPTED for this purpose. Like the MMIO case, only the
> caller knows what kind of memory it has and must inform the DMA API
> for it to work correctly.
>
> Signed-off-by: Jiri Pirko <jiri(a)nvidia.com>
> ---
> v1->v2:
> - rebased on top of recent dma-mapping-fixes
> ---
> include/linux/dma-mapping.h | 6 ++++++
> include/trace/events/dma.h | 3 ++-
> kernel/dma/direct.h | 14 +++++++++++---
> 3 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 29973baa0581..ae3d85e494ec 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -85,6 +85,12 @@
> * a cacheline must have this attribute for this to be considered safe.
> */
> #define DMA_ATTR_CPU_CACHE_CLEAN (1UL << 11)
> +/*
> + * DMA_ATTR_CC_DECRYPTED: Indicates memory that has been explicitly decrypted
> + * (shared) for confidential computing guests. The caller must have
> + * called set_memory_decrypted(). A struct page is required.
> + */
> +#define DMA_ATTR_CC_DECRYPTED (1UL << 12)
While adding the new attribute is fine, I would expect additional checks in
dma_map_phys() to ensure the attribute cannot be misused. For example,
WARN_ON(attrs & (DMA_ATTR_CC_DECRYPTED | DMA_ATTR_MMIO)), along with a check
that we are taking the direct path only.
Thanks
Changelog:
v7:
* Fixed messed VFIO patch due to rebase.
v6: https://patch.msgid.link/20260130-dmabuf-revoke-v6-0-06278f9b7bf0@nvidia.com
* Added Reviewed-by tags.
* Changed for blocking wait_for_completion() in VFIO
* Fixed race between ->attach and move_notify, where priv->revoked is
flipped and lock is released.
v5: https://patch.msgid.link/20260124-dmabuf-revoke-v5-0-f98fca917e96@nvidia.com
* Documented the DMA-BUF expectations around DMA unmap.
* Added wait support in VFIO for DMA unmap.
* Reordered patches.
* Improved commit messages to document even more.
v4: https://lore.kernel.org/all/20260121-dmabuf-revoke-v4-0-d311cbc8633d@nvidia…
* Changed DMA_RESV_USAGE_KERNEL to DMA_RESV_USAGE_BOOKKEEP.
* Made .invalidate_mapping() truly optional.
* Added patch which renames dma_buf_move_notify() to be
dma_buf_invalidate_mappings().
* Restored dma_buf_attachment_is_dynamic() function.
v3: https://lore.kernel.org/all/20260120-dmabuf-revoke-v3-0-b7e0b07b8214@nvidia…
* Used Jason's wordings for commits and cover letter.
* Removed IOMMUFD patch.
* Renamed dma_buf_attachment_is_revoke() to be dma_buf_attach_revocable().
* Added patch to remove CONFIG_DMABUF_MOVE_NOTIFY.
* Added Reviewed-by tags.
* Called to dma_resv_wait_timeout() after dma_buf_move_notify() in VFIO.
* Added dma_buf_attach_revocable() check to VFIO DMABUF attach function.
* Slightly changed commit messages.
v2: https://patch.msgid.link/20260118-dmabuf-revoke-v2-0-a03bb27c0875@nvidia.com
* Changed series to document the revoke semantics instead of
implementing it.
v1: https://patch.msgid.link/20260111-dmabuf-revoke-v1-0-fb4bcc8c259b@nvidia.com
-------------------------------------------------------------------------
This series is based on latest VFIO fix, which will be sent to Linus
very soon.
https://lore.kernel.org/all/20260121-vfio-add-pin-v1-1-4e04916b17f1@nvidia.…
Thanks
-------------------------------------------------------------------------
This series documents a dma-buf “revoke” mechanism: to allow a dma-buf
exporter to explicitly invalidate (“kill”) a shared buffer after it has
been distributed to importers, so that further CPU and device access is
prevented and importers reliably observe failure.
The change in this series is to properly document and use existing core
“revoked” state on the dma-buf object and a corresponding exporter-triggered
revoke operation.
dma-buf has quietly allowed calling move_notify on pinned dma-bufs, even
though legacy importers using dma_buf_attach() would simply ignore
these calls.
The intention was that move_notify() would tell the importer to expedite
it's unmapping process and once the importer is fully finished with DMA it
would unmap the dma-buf which finally signals that the importer is no
longer ever going to touch the memory again. Importers that touch past
their unmap() call can trigger IOMMU errors, AER and beyond, however
read-and-discard access between move_notify() and unmap is allowed.
Thus, we can define the exporter's revoke sequence for pinned dma-buf as:
dma_resv_lock(dmabuf->resv, NULL);
// Prevent new mappings from being established
priv->revoked = true;
// Tell all importers to eventually unmap
dma_buf_invalidate_mappings(dmabuf);
// Wait for any inprogress fences on the old mapping
dma_resv_wait_timeout(dmabuf->resv,
DMA_RESV_USAGE_BOOKKEEP, false,
MAX_SCHEDULE_TIMEOUT);
dma_resv_unlock(dmabuf->resv, NULL);
// Wait for all importers to complete unmap
wait_for_completion(&priv->unmapp_comp);
However, dma-buf also supports importers that don't do anything on
move_notify(), and will not unmap the buffer in bounded time.
Since such importers would cause the above sequence to hang, a new
mechanism is needed to detect incompatible importers.
Introduce dma_buf_attach_revocable() which if true indicates the above
sequence is safe to use and will complete in kernel-only bounded time for
this attachment.
Unfortunately dma_buf_attach_revocable() is going to fail for the popular
RDMA pinned importer, which means we cannot introduce it to existing
places using pinned move_notify() without potentially breaking existing
userspace flows.
Existing exporters that only trigger this flow for RAS errors should not
call dma_buf_attach_revocable() and will suffer an unbounded block on the
final completion, hoping that the userspace will notice the RAS and clean
things up. Without revoke support on the RDMA pinned importers it doesn't
seem like any other non-breaking option is currently possible.
For new exporters, like VFIO and RDMA, that have userspace triggered
revoke events, the unbouned sleep would not be acceptable. They can call
dma_buf_attach_revocable() and will not work with the RDMA pinned importer
from day 0, preventing regressions.
In the process add documentation explaining the above details.
Thanks
Signed-off-by: Leon Romanovsky <leonro(a)nvidia.com>
---
Leon Romanovsky (8):
dma-buf: Rename .move_notify() callback to a clearer identifier
dma-buf: Rename dma_buf_move_notify() to dma_buf_invalidate_mappings()
dma-buf: Always build with DMABUF_MOVE_NOTIFY
vfio: Wait for dma-buf invalidation to complete
dma-buf: Make .invalidate_mapping() truly optional
dma-buf: Add dma_buf_attach_revocable()
vfio: Permit VFIO to work with pinned importers
iommufd: Add dma_buf_pin()
drivers/dma-buf/Kconfig | 12 -----
drivers/dma-buf/dma-buf.c | 69 ++++++++++++++++++++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 14 ++---
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +-
drivers/gpu/drm/amd/amdkfd/Kconfig | 2 +-
drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +-
drivers/gpu/drm/xe/tests/xe_dma_buf.c | 7 ++-
drivers/gpu/drm/xe/xe_bo.c | 2 +-
drivers/gpu/drm/xe/xe_dma_buf.c | 14 ++---
drivers/infiniband/core/umem_dmabuf.c | 13 -----
drivers/infiniband/hw/mlx5/mr.c | 2 +-
drivers/iommu/iommufd/pages.c | 11 +++-
drivers/iommu/iommufd/selftest.c | 2 +-
drivers/vfio/pci/vfio_pci_dmabuf.c | 80 ++++++++++++++++++++++-------
include/linux/dma-buf.h | 17 +++---
15 files changed, 153 insertions(+), 96 deletions(-)
---
base-commit: 61ceaf236115f20f4fdd7cf60f883ada1063349a
change-id: 20251221-dmabuf-revoke-b90ef16e4236
Best regards,
--
Leon Romanovsky <leonro(a)nvidia.com>
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