[PATCH v16 1/6] arm64/gcs: Ensure FGTs for EL1 GCS instructions are disabled

[Mark Brown]

The initial EL2 setup for GCS did not include disabling of EL1 usage of
GCS instructions, also disable these traps.  This is the first disabling
of instruction traps, use x2 to store the value to be written.

Signed-off-by: Mark Brown <broonie at kernel.org>
---
 arch/arm64/include/asm/el2_setup.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index 46033027510c..d174f405c44a 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -353,6 +353,11 @@
 	orr	x0, x0, #HFGRTR_EL2_nGCS_EL1_MASK
 	orr	x0, x0, #HFGRTR_EL2_nGCS_EL0_MASK
 
+	/* Disable traps of GCS instructions at EL1 */
+	orr	x2, x2, #HFGITR_EL2_nGCSEPP_MASK
+	orr	x2, x2, #HFGITR_EL2_nGCSSTR_EL1_MASK
+	orr	x2, x2, #HFGITR_EL2_nGCSPUSHM_EL1_MASK
+
 .Lskip_gce_fgt_\@:
 
 .Lset_fgt_\@:

-- 
2.47.2