linux-kernel - [RFC 09/10] KVM: arm64: nv: Enable HDFGRTR2_EL2 & HDFGWTR2

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Date: Thu, 20 Jun 2024 12:28:06 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org,
	maz@...nel.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [RFC 09/10] KVM: arm64: nv: Enable HDFGRTR2_EL2 & HDFGWTR2_EL2 access from virtual EL2

This adds VNCR-capable HDFGRTR2_EL2 and HDFGWTR2_EL2 registers into enum
vcpu_sysreg and also enables their access from virtual EL2 environment.

Cc: Marc Zyngier <maz@...nel.org>
Cc: Oliver Upton <oliver.upton@...ux.dev>
Cc: James Morse <james.morse@....com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: kvmarm@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/include/asm/kvm_host.h     | 3 +++
 arch/arm64/include/asm/vncr_mapping.h | 2 ++
 arch/arm64/kvm/sys_regs.c             | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 36b8e97bf49e..7b44e96e7270 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -488,6 +488,9 @@ enum vcpu_sysreg {
 	VNCR(HDFGWTR_EL2),
 	VNCR(HAFGRTR_EL2),
 
+	VNCR(HDFGRTR2_EL2),
+	VNCR(HDFGWTR2_EL2),
+
 	VNCR(CNTVOFF_EL2),
 	VNCR(CNTV_CVAL_EL0),
 	VNCR(CNTV_CTL_EL0),
diff --git a/arch/arm64/include/asm/vncr_mapping.h b/arch/arm64/include/asm/vncr_mapping.h
index df2c47c55972..de9288bc2b84 100644
--- a/arch/arm64/include/asm/vncr_mapping.h
+++ b/arch/arm64/include/asm/vncr_mapping.h
@@ -38,6 +38,8 @@
 #define VNCR_HFGRTR_EL2		0x1B8
 #define VNCR_HFGWTR_EL2		0x1C0
 #define VNCR_HFGITR_EL2		0x1C8
+#define VNCR_HDFGRTR2_EL2	0x1A0
+#define VNCR_HDFGWTR2_EL2	0x1B0
 #define VNCR_HDFGRTR_EL2	0x1D0
 #define VNCR_HDFGWTR_EL2	0x1D8
 #define VNCR_ZCR_EL1            0x1E0
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 22b45a15d068..f921af014d0c 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2697,6 +2697,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	EL2_REG_VNCR(VTCR_EL2, reset_val, 0),
 
 	{ SYS_DESC(SYS_DACR32_EL2), trap_undef, reset_unknown, DACR32_EL2 },
+	EL2_REG_VNCR(HDFGRTR2_EL2, reset_val, 0),
+	EL2_REG_VNCR(HDFGWTR2_EL2, reset_val, 0),
 	EL2_REG_VNCR(HDFGRTR_EL2, reset_val, 0),
 	EL2_REG_VNCR(HDFGWTR_EL2, reset_val, 0),
 	EL2_REG_VNCR(HAFGRTR_EL2, reset_val, 0),
-- 
2.25.1