[PATCH v19 01/14] arm64/gcs: Ensure FGTs for EL1 GCS instructions are disabled
From: Mark Brown <broonie@kernel.org>
Date: 2026-08-12 19:13:18
Also in:
kvmarm, linux-arm-kernel, linux-kselftest, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
The initial EL2 setup for GCS did not include disabling of EL1 usage of
GCS instructions, also disable these traps.
Fixes: ff5181d8a2a8 ("arm64/gcs: Provide basic EL2 setup to allow GCS usage at EL0 and EL1")
Signed-off-by: Mark Brown <broonie@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 aa8ec9df8024..d308c6e6757d 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h@@ -393,6 +393,11 @@ 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_\@:
--
2.47.3