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List: linux-keyrings
Subject: [Patch v3 1/7] tee: optee: allow kernel pages to register as shm
From: Sumit Garg <sumit.garg () linaro ! org>
Date: 2019-10-31 13:59:43
Message-ID: 1572530323-14802-2-git-send-email-sumit.garg () linaro ! org
[Download RAW message or body]
Kernel pages are marked as normal type memory only so allow kernel pages
to be registered as shared memory with OP-TEE.
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
---
drivers/tee/optee/call.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index 13b0269..cf2367b 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -554,6 +554,13 @@ static int check_mem_type(unsigned long start, size_t num_pages)
struct mm_struct *mm = current->mm;
int rc;
+ /*
+ * Allow kernel address to register with OP-TEE as kernel
+ * pages are configured as normal memory only.
+ */
+ if (virt_addr_valid(start))
+ return 0;
+
down_read(&mm->mmap_sem);
rc = __check_mem_type(find_vma(mm, start),
start + num_pages * PAGE_SIZE);
--
2.7.4
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