17 May
2023
17 May
'23
9:08 a.m.
On Wed, May 17, 2023 at 01:22:51PM +0530, Sumit Garg wrote:
+#if IS_ENABLED(CONFIG_CMA)
page_flag |= FOLL_LONGTERM;+#endif if (flags & TEE_SHM_USER_MAPPED)
If this mapping is long live it should always use FOLL_LONGTERM.
It depends on the userspace application needs. However, I think it should be safe to use FOLL_LONGTERM by default to serve cases like secure media playback.
long term is defined as won't automatically go away during the same syscall.