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This is the next version of the shmem backed GEM objects series
originally from Asahi, previously posted by Daniel Almeida.
The previous version of the patch series can be found here:
https://patchwork.freedesktop.org/series/156093/
This patch series may be applied on top of the
driver-core/driver-core-testing branch:
https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git…
Changelogs are per-patch
Asahi Lina (2):
rust: helpers: Add bindings/wrappers for dma_resv_lock
rust: drm: gem: shmem: Add DRM shmem helper abstraction
Lyude Paul (5):
rust: drm: Add gem::impl_aref_for_gem_obj!
rust: drm: gem: Add raw_dma_resv() function
rust: gem: Introduce DriverObject::Args
rust: drm: gem: Introduce shmem::SGTable
rust: drm/gem: Add vmap functions to shmem bindings
drivers/gpu/drm/nova/gem.rs | 5 +-
drivers/gpu/drm/tyr/gem.rs | 3 +-
rust/bindings/bindings_helper.h | 3 +
rust/helpers/dma-resv.c | 13 +
rust/helpers/drm.c | 56 ++-
rust/helpers/helpers.c | 1 +
rust/kernel/drm/gem/mod.rs | 79 +++-
rust/kernel/drm/gem/shmem.rs | 654 ++++++++++++++++++++++++++++++++
8 files changed, 792 insertions(+), 22 deletions(-)
create mode 100644 rust/helpers/dma-resv.c
create mode 100644 rust/kernel/drm/gem/shmem.rs
base-commit: dc33ae50d32b509af5ae61030912fa20c79ef112
prerequisite-patch-id: c631986f96e2073263e97e82a65b96fc5ada6924
prerequisite-patch-id: ae853e8eb8d58c77881371960be4ae92755e83c6
prerequisite-patch-id: 0ab78b50648c7d8f66b83c32ed2af0ec3ede42a3
prerequisite-patch-id: 636ec7f913f4047e5e1a1788f3e835b7259698c2
prerequisite-patch-id: d75e4d7140eadeeed8017af8cd093bfd2766ee8e
prerequisite-patch-id: 67a8010c1bc95bca1d2cf6b246c67bc79d24e766
--
2.53.0
On 2026-03-16 12:58 pm, 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.
Echoing Jason's point, if the intent of this is to indicate shared
memory, please call it DMA_ATTR_CC_SHARED. Yes, some of the existing
APIs are badly named because they conflated intent with implementation
details; that is no reason to keep wilfully making the same mistake.
At least with Arm CCA, the architecture enforces *confidentiality*
pretty much orthogonally to encryption - if your threat model excludes
physical attacks against DRAM, you can still have Realms isolated from
each other (and of course other execution states) without even
implementing the memory encryption feature; conversely if you do have
it, then even all the shared/host memory may still be physically
encrypted, it just has its own context (key) distinct from the Realm
ones. Similarly, while it's not a "true" CoCo environment, pKVM has a
similar notion of shared vs. private which can benefit from
piggy-backing off much of the CoCo infrastructure in places like the DMA
layer, but has nothing whatsoever to do with actual encryption.
Furthermore, "shared" is just shorter and more readable, even before I
invoke the previous discussion of why it should be "unencrypted" rather
than "decrypted" anyway ;)
> Signed-off-by: Jiri Pirko <jiri(a)nvidia.com>
> ---
> v3->v4:
> - added some sanity checks to dma_map_phys and dma_unmap_phys
> - enhanced documentation of DMA_ATTR_CC_DECRYPTED attr
> v1->v2:
> - rebased on top of recent dma-mapping-fixes
> ---
> include/linux/dma-mapping.h | 10 ++++++++++
> include/trace/events/dma.h | 3 ++-
> kernel/dma/direct.h | 14 +++++++++++---
> kernel/dma/mapping.c | 13 +++++++++++--
> 4 files changed, 34 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 29973baa0581..476964d2b22f 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -85,6 +85,16 @@
> * 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 the DMA mapping is decrypted (shared) for
> + * confidential computing guests. For normal system memory the caller must have
> + * called set_memory_decrypted(), and pgprot_decrypted must be used when
> + * creating CPU PTEs for the mapping. The same decrypted semantic may be passed
> + * to the vIOMMU when it sets up the IOPTE. For MMIO use together with
That being "the vIOMMU" that you said doesn't exist, and which is
explicitly not supported?...
> + * DMA_ATTR_MMIO to indicate decrypted MMIO. Unless DMA_ATTR_MMIO is provided
> + * a struct page is required.
> + */
> +#define DMA_ATTR_CC_DECRYPTED (1UL << 12)
>
> /*
> * A dma_addr_t can hold any valid DMA or bus address for the platform. It can
> diff --git a/include/trace/events/dma.h b/include/trace/events/dma.h
> index 33e99e792f1a..b8082d5177c4 100644
> --- a/include/trace/events/dma.h
> +++ b/include/trace/events/dma.h
> @@ -32,7 +32,8 @@ TRACE_DEFINE_ENUM(DMA_NONE);
> { DMA_ATTR_ALLOC_SINGLE_PAGES, "ALLOC_SINGLE_PAGES" }, \
> { DMA_ATTR_NO_WARN, "NO_WARN" }, \
> { DMA_ATTR_PRIVILEGED, "PRIVILEGED" }, \
> - { DMA_ATTR_MMIO, "MMIO" })
> + { DMA_ATTR_MMIO, "MMIO" }, \
> + { DMA_ATTR_CC_DECRYPTED, "CC_DECRYPTED" })
>
> DECLARE_EVENT_CLASS(dma_map,
> TP_PROTO(struct device *dev, phys_addr_t phys_addr, dma_addr_t dma_addr,
> diff --git a/kernel/dma/direct.h b/kernel/dma/direct.h
> index e89f175e9c2d..c047a9d0fda3 100644
> --- a/kernel/dma/direct.h
> +++ b/kernel/dma/direct.h
> @@ -84,16 +84,24 @@ static inline dma_addr_t dma_direct_map_phys(struct device *dev,
> dma_addr_t dma_addr;
>
> if (is_swiotlb_force_bounce(dev)) {
> - if (attrs & DMA_ATTR_MMIO)
> - return DMA_MAPPING_ERROR;
> + if (!(attrs & DMA_ATTR_CC_DECRYPTED)) {
> + if (attrs & DMA_ATTR_MMIO)
> + return DMA_MAPPING_ERROR;
>
> - return swiotlb_map(dev, phys, size, dir, attrs);
> + return swiotlb_map(dev, phys, size, dir, attrs);
> + }
> + } else if (attrs & DMA_ATTR_CC_DECRYPTED) {
> + return DMA_MAPPING_ERROR;
> }
>
> if (attrs & DMA_ATTR_MMIO) {
> dma_addr = phys;
> if (unlikely(!dma_capable(dev, dma_addr, size, false)))
> goto err_overflow;
> + } else if (attrs & DMA_ATTR_CC_DECRYPTED) {
> + dma_addr = phys_to_dma_unencrypted(dev, phys);
> + if (unlikely(!dma_capable(dev, dma_addr, size, false)))
> + goto err_overflow;
> } else {
> dma_addr = phys_to_dma(dev, phys);
> if (unlikely(!dma_capable(dev, dma_addr, size, true)) ||
> diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
> index 3928a509c44c..abb0c88b188b 100644
> --- a/kernel/dma/mapping.c
> +++ b/kernel/dma/mapping.c
> @@ -157,6 +157,7 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
> {
> const struct dma_map_ops *ops = get_dma_ops(dev);
> bool is_mmio = attrs & DMA_ATTR_MMIO;
> + bool is_cc_decrypted = attrs & DMA_ATTR_CC_DECRYPTED;
> dma_addr_t addr = DMA_MAPPING_ERROR;
>
> BUG_ON(!valid_dma_direction(dir));
> @@ -165,8 +166,11 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
> return DMA_MAPPING_ERROR;
>
> if (dma_map_direct(dev, ops) ||
> - (!is_mmio && arch_dma_map_phys_direct(dev, phys + size)))
> + (!is_mmio && !is_cc_decrypted &&
> + arch_dma_map_phys_direct(dev, phys + size)))
> addr = dma_direct_map_phys(dev, phys, size, dir, attrs);
> + else if (is_cc_decrypted)
> + return DMA_MAPPING_ERROR;
> else if (use_dma_iommu(dev))
...although, why *shouldn't* this be allowed with a vIOMMU? (Especially
given that a vIOMMU for untrusted devices can be emulated by the host
VMM without the CoCo hypervisor having to care at all - again, at least
on Arm and other architectures where IOMMUs are regular driver model
devices)
> addr = iommu_dma_map_phys(dev, phys, size, dir, attrs);
> else if (ops->map_phys)
Or indeed any other non-direct ops? Obviously all the legacy
architectures like Alpha are never going to see this or care, but I
could imagine Xen and possibly PowerPC might.
Thanks,
Robin.
> @@ -203,11 +207,16 @@ void dma_unmap_phys(struct device *dev, dma_addr_t addr, size_t size,
> {
> const struct dma_map_ops *ops = get_dma_ops(dev);
> bool is_mmio = attrs & DMA_ATTR_MMIO;
> + bool is_cc_decrypted = attrs & DMA_ATTR_CC_DECRYPTED;
>
> BUG_ON(!valid_dma_direction(dir));
> +
> if (dma_map_direct(dev, ops) ||
> - (!is_mmio && arch_dma_unmap_phys_direct(dev, addr + size)))
> + (!is_mmio && !is_cc_decrypted &&
> + arch_dma_unmap_phys_direct(dev, addr + size)))
> dma_direct_unmap_phys(dev, addr, size, dir, attrs);
> + else if (is_cc_decrypted)
> + return;
> else if (use_dma_iommu(dev))
> iommu_dma_unmap_phys(dev, addr, size, dir, attrs);
> else if (ops->unmap_phys)
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This patch series adds a new dma-buf heap driver that exposes coherent,
non‑reusable reserved-memory regions as named heaps, so userspace can
explicitly allocate buffers from those device‑specific pools.
Motivation: we want cgroup accounting for all userspace‑visible buffer
allocations (DRM, v4l2, dma‑buf heaps, etc.). That’s hard to do when
drivers call dma_alloc_attrs() directly because the accounting controller
(memcg vs dmem) is ambiguous. The long‑term plan is to steer those paths
toward dma‑buf heaps, where each heap can unambiguously charge a single
controller. To reach that goal, we need a heap backend for each
dma_alloc_attrs() memory type. CMA and system heaps already exist;
coherent reserved‑memory was the missing piece, since many SoCs define
dedicated, device‑local coherent pools in DT under /reserved-memory using
"shared-dma-pool" with non‑reusable regions (i.e., not CMA) that are
carved out exclusively for coherent DMA and are currently only usable by
in‑kernel drivers.
Because these regions are device‑dependent, each heap instance binds a
heap device to its reserved‑mem region via a newly introduced helper
function -namely, of_reserved_mem_device_init_with_mem()- so coherent
allocations use the correct dev->dma_mem.
Charging to cgroups for these buffers is intentionally left out to keep
review focused on the new heap; I plan to follow up based on Eric’s [1]
and Maxime’s [2] work on dmem charging from userspace.
This series also makes the new heap driver modular, in line with the CMA
heap change in [3].
[1] https://lore.kernel.org/all/20260218-dmabuf-heap-cma-dmem-v2-0-b249886fb7b2…
[2] https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.…
[3] https://lore.kernel.org/all/20260303-dma-buf-heaps-as-modules-v3-0-24344812…
Signed-off-by: Albert Esteve <aesteve(a)redhat.com>
---
Changes in v3:
- Reorganized changesets among patches to ensure bisectability
- Removed unused dma_heap_coherent_register() leftover
- Removed fallback when setting mask in coherent heap dev, since
dma_set_mask() already truncates to supported masks
- Moved struct rmem_assigned_device (rd) logic to
of_reserved_mem_device_init_with_mem() to allow listing the device
- Link to v2: https://lore.kernel.org/r/20260303-b4-dmabuf-heap-coherent-rmem-v2-0-65a465…
Changes in v2:
- Removed dmem charging parts
- Moved coherent heap registering logic to coherent.c
- Made heap device a member of struct dma_heap
- Split dma_heap_add logic into create/register, to be able to
access the stored heap device before registered.
- Avoid platform device in favour of heap device
- Added a wrapper to rmem device_init() op
- Switched from late_initcall() to module_init()
- Made the coherent heap driver modular
- Link to v1: https://lore.kernel.org/r/20260224-b4-dmabuf-heap-coherent-rmem-v1-1-dffef4…
---
Albert Esteve (5):
dma-buf: dma-heap: split dma_heap_add
of_reserved_mem: add a helper for rmem device_init op
dma: coherent: store reserved memory coherent regions
dma-buf: heaps: Add Coherent heap to dmabuf heaps
dma-buf: heaps: coherent: Turn heap into a module
John Stultz (1):
dma-buf: dma-heap: Keep track of the heap device struct
drivers/dma-buf/dma-heap.c | 138 +++++++++--
drivers/dma-buf/heaps/Kconfig | 9 +
drivers/dma-buf/heaps/Makefile | 1 +
drivers/dma-buf/heaps/coherent_heap.c | 417 ++++++++++++++++++++++++++++++++++
drivers/of/of_reserved_mem.c | 68 ++++--
include/linux/dma-heap.h | 5 +
include/linux/dma-map-ops.h | 7 +
include/linux/of_reserved_mem.h | 8 +
kernel/dma/coherent.c | 34 +++
9 files changed, 640 insertions(+), 47 deletions(-)
---
base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
change-id: 20260223-b4-dmabuf-heap-coherent-rmem-91fd3926afe9
Best regards,
--
Albert Esteve <aesteve(a)redhat.com>
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