selftests/bpf: Reject graph kptr use after RCU unlockgrafted

Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.

Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.

Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.

Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/accel/ivpu/Makefile b/drivers/accel/ivpu/Makefile
new file mode 100644
index 000000000..dbf76b8a5
--- /dev/null
+++ b/drivers/accel/ivpu/Makefile
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2023-2024 Intel Corporation
+
+intel_vpu-y := \
+	ivpu_drv.o \
+	ivpu_fw.o \
+	ivpu_fw_log.o \
+	ivpu_gem.o \
+	ivpu_gem_userptr.o \
+	ivpu_hw.o \
+	ivpu_hw_btrs.o \
+	ivpu_hw_ip.o \
+	ivpu_ipc.o \
+	ivpu_job.o \
+	ivpu_jsm_msg.o \
+	ivpu_mmu.o \
+	ivpu_mmu_context.o \
+	ivpu_ms.o \
+	ivpu_pm.o \
+	ivpu_sysfs.o \
+	ivpu_trace_points.o
+
+intel_vpu-$(CONFIG_DEBUG_FS) += ivpu_debugfs.o
+intel_vpu-$(CONFIG_DEV_COREDUMP) += ivpu_coredump.o
+
+obj-$(CONFIG_DRM_ACCEL_IVPU) += intel_vpu.o
+
+subdir-ccflags-$(CONFIG_DRM_ACCEL_IVPU_DEBUG) += -DDEBUG
+
+CFLAGS_ivpu_trace_points.o = -I$(src)