[RFC,v2,1/6] tee: optee: allow kernel pages to register as shm
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Message ID 1564489420-677-2-git-send-email-sumit.garg@linaro.org
State New
Headers show
Series
  • Introduce TEE based Trusted Keys support
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Commit Message

Sumit Garg July 30, 2019, 12:23 p.m. UTC
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(+)

Patch
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diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index aa94270..bce45b1 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -553,6 +553,13 @@  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);