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Vincenzo Frascino authored
When MTE is present, the GCR_EL1 register contains the tags mask that allows to exclude tags from the random generation via the IRG instruction. With the introduction of the new Tag-Based KASAN API that provides a mechanism to reserve tags for special reasons, the MTE implementation has to make sure that the GCR_EL1 setting for the kernel does not affect the userspace processes and viceversa. Save and restore the kernel/user mask in GCR_EL1 in kernel entry and exit. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> --- Change-Id: I0081cba5ace27a9111bebb239075c9a466af4c84
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