[irqchip: irq/irqchip-next] arm64: Disable GICv5 read/write/instruction traps

["irqchip-bot for Lorenzo Pieralisi" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     25374470f91aebbb1ca3f589f0ce57fd39b2d6d3
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/25374470f91aebbb1ca3f589f0ce57fd39b2d6d3
Author:        Lorenzo Pieralisi <lpieralisi@kernel.org>
AuthorDate:    Thu, 03 Jul 2025 12:25:05 +02:00
Committer:     Marc Zyngier <maz@kernel.org>
CommitterDate: Tue, 08 Jul 2025 18:35:51 +01:00

arm64: Disable GICv5 read/write/instruction traps

GICv5 trap configuration registers value is UNKNOWN at reset.

Initialize GICv5 EL2 trap configuration registers to prevent
trapping GICv5 instruction/register access upon entering the
kernel.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-15-12e71f1b3528@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/el2_setup.h | 45 +++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index ba5df0d..54abcb1 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -165,6 +165,50 @@
 .Lskip_gicv3_\@:
 .endm
 
+/* GICv5 system register access */
+.macro __init_el2_gicv5
+	mrs_s	x0, SYS_ID_AA64PFR2_EL1
+	ubfx	x0, x0, #ID_AA64PFR2_EL1_GCIE_SHIFT, #4
+	cbz	x0, .Lskip_gicv5_\@
+
+	mov	x0, #(ICH_HFGITR_EL2_GICRCDNMIA		| \
+		      ICH_HFGITR_EL2_GICRCDIA		| \
+		      ICH_HFGITR_EL2_GICCDDI		| \
+		      ICH_HFGITR_EL2_GICCDEOI		| \
+		      ICH_HFGITR_EL2_GICCDHM		| \
+		      ICH_HFGITR_EL2_GICCDRCFG		| \
+		      ICH_HFGITR_EL2_GICCDPEND		| \
+		      ICH_HFGITR_EL2_GICCDAFF		| \
+		      ICH_HFGITR_EL2_GICCDPRI		| \
+		      ICH_HFGITR_EL2_GICCDDIS		| \
+		      ICH_HFGITR_EL2_GICCDEN)
+	msr_s	SYS_ICH_HFGITR_EL2, x0		// Disable instruction traps
+	mov_q	x0, (ICH_HFGRTR_EL2_ICC_PPI_ACTIVERn_EL1	| \
+		     ICH_HFGRTR_EL2_ICC_PPI_PRIORITYRn_EL1	| \
+		     ICH_HFGRTR_EL2_ICC_PPI_PENDRn_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_PPI_ENABLERn_EL1	| \
+		     ICH_HFGRTR_EL2_ICC_PPI_HMRn_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_IAFFIDR_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_ICSR_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_PCR_EL1			| \
+		     ICH_HFGRTR_EL2_ICC_HPPIR_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_HAPR_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_CR0_EL1			| \
+		     ICH_HFGRTR_EL2_ICC_IDRn_EL1		| \
+		     ICH_HFGRTR_EL2_ICC_APR_EL1)
+	msr_s	SYS_ICH_HFGRTR_EL2, x0		// Disable reg read traps
+	mov_q	x0, (ICH_HFGWTR_EL2_ICC_PPI_ACTIVERn_EL1	| \
+		     ICH_HFGWTR_EL2_ICC_PPI_PRIORITYRn_EL1	| \
+		     ICH_HFGWTR_EL2_ICC_PPI_PENDRn_EL1		| \
+		     ICH_HFGWTR_EL2_ICC_PPI_ENABLERn_EL1	| \
+		     ICH_HFGWTR_EL2_ICC_ICSR_EL1		| \
+		     ICH_HFGWTR_EL2_ICC_PCR_EL1			| \
+		     ICH_HFGWTR_EL2_ICC_CR0_EL1			| \
+		     ICH_HFGWTR_EL2_ICC_APR_EL1)
+	msr_s	SYS_ICH_HFGWTR_EL2, x0		// Disable reg write traps
+.Lskip_gicv5_\@:
+.endm
+
 .macro __init_el2_hstr
 	msr	hstr_el2, xzr			// Disable CP15 traps to EL2
 .endm
@@ -314,6 +358,7 @@
 	__init_el2_lor
 	__init_el2_stage2
 	__init_el2_gicv3
+	__init_el2_gicv5
 	__init_el2_hstr
 	__init_el2_nvhe_idregs
 	__init_el2_cptr