linux-kernel - [PATCH 2/3] arm64/sysreg: Add ICH_VMCR

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Message-ID: <20251007153505.1606208-3-sascha.bischoff@arm.com>
Date: Tue, 7 Oct 2025 15:35:14 +0000
From: Sascha Bischoff <Sascha.Bischoff@....com>
To: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "kvmarm@...ts.linux.dev"
	<kvmarm@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC: nd <nd@....com>, Mark Rutland <Mark.Rutland@....com>, Mark Brown
	<broonie@...nel.org>, Catalin Marinas <Catalin.Marinas@....com>,
	"maz@...nel.org" <maz@...nel.org>, "oliver.upton@...ux.dev"
	<oliver.upton@...ux.dev>, Joey Gouly <Joey.Gouly@....com>, Suzuki Poulose
	<Suzuki.Poulose@....com>, "yuzenghui@...wei.com" <yuzenghui@...wei.com>,
	"will@...nel.org" <will@...nel.org>, "lpieralisi@...nel.org"
	<lpieralisi@...nel.org>
Subject: [PATCH 2/3] arm64/sysreg: Add ICH_VMCR_EL2

Add the ICH_VMCR_EL2 register, which is required for the upcoming
GICv5 KVM support. This register has two different field encodings,
based on if it is used for GICv3 or GICv5-based VMs. The
GICv5-specific field encodings are generated with a FEAT_GCIE prefix.

This register is already described in the GICv3 KVM code
directly. This will be ported across to use the generated encodings as
part of an upcoming change.

Signed-off-by: Sascha Bischoff <sascha.bischoff@....com>
---
 arch/arm64/tools/sysreg | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index 696ab1f32a674..a2bf8a689f968 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -4668,6 +4668,28 @@ Field	1	V3
 Field	0	En
 EndSysreg
 
+Sysreg	ICH_VMCR_EL2	3	4	12	11	7
+Feat	FEAT_GCIE
+Res0	63:32
+Field	31:27	VPMR
+Res0	26:1
+Field	0	EN
+ElseFeat
+Res0	63:32
+Field	31:24	VPMR
+Field	23:21	VBPR0
+Field	20:18	VBPR1
+Res0	17:10
+Field	9	VEOIM
+Res0	8:5
+Field	4	VCBPR
+Field	3	VFIQEn
+Field	2	VAckCtl
+Field	1	VENG1
+Field	0	VENG0
+EndFeat
+EndSysreg
+
 Sysreg	CONTEXTIDR_EL2	3	4	13	0	1
 Fields	CONTEXTIDR_ELx
 EndSysreg
-- 
2.34.1