linux-stable/kernel
Shanker Donthineni 7623279377 dma/pool: Ensure DMA_DIRECT_REMAP allocations are decrypted
commit 89a2d212bd upstream.

When CONFIG_DMA_DIRECT_REMAP is enabled, atomic pool pages are
remapped via dma_common_contiguous_remap() using the supplied
pgprot. Currently, the mapping uses
pgprot_dmacoherent(PAGE_KERNEL), which leaves the memory encrypted
on systems with memory encryption enabled (e.g., ARM CCA Realms).

This can cause the DMA layer to fail or crash when accessing the
memory, as the underlying physical pages are not configured as
expected.

Fix this by requesting a decrypted mapping in the vmap() call:
pgprot_decrypted(pgprot_dmacoherent(PAGE_KERNEL))

This ensures that atomic pool memory is consistently mapped
unencrypted.

Cc: stable@vger.kernel.org
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20250811181759.998805-1-sdonthineni@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-09-04 15:26:30 +02:00
..
bpf bpf/preload: Don't select USERMODE_DRIVER 2025-08-15 12:05:00 +02:00
cgroup cgroup/cpuset: Use static_branch_enable_cpuslocked() on cpusets_insane_config_key 2025-08-28 16:26:17 +02:00
configs
debug
dma dma/pool: Ensure DMA_DIRECT_REMAP allocations are decrypted 2025-09-04 15:26:30 +02:00
entry
events perf/core: Prevent VMA split of buffer mappings 2025-08-15 12:05:11 +02:00
futex
gcov
irq
kcsan kcsan: test: Initialize dummy variable 2025-08-15 12:04:59 +02:00
livepatch
locking
module module: Prevent silent truncation of module name in delete_module(2) 2025-08-28 16:26:01 +02:00
power PM: sleep: console: Fix the black screen issue 2025-08-28 16:25:53 +02:00
printk
rcu rcu: Protect ->defer_qs_iw_pending from data race 2025-08-28 16:25:55 +02:00
sched sched/fair: Bump sd->max_newidle_lb_cost when newidle balance fails 2025-08-28 16:25:56 +02:00
time
trace ftrace: Fix potential warning in trace_printk_seq during ftrace_dump 2025-09-04 15:26:24 +02:00
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