linux-kernel - [PATCH v2 1/3] KVM: arm64: Define helper for EL2 registers with custom visibility

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Message-Id: <20240822-kvm-arm64-hide-pie-regs-v2-1-376624fa829c@kernel.org>
Date: Thu, 22 Aug 2024 00:35:36 +0100
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>, 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>, 
 Joey Gouly <joey.gouly@....com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>, 
 20240813144738.2048302-1-maz@...nel.org
Subject: [PATCH v2 1/3] KVM: arm64: Define helper for EL2 registers with
 custom visibility

In preparation for adding more visibility filtering for EL2 registers add
a helper macro like EL2_REG() which allows specification of a custom
visibility operation.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 arch/arm64/kvm/sys_regs.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d0b4509e59cb..1af15140e067 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2136,6 +2136,15 @@ static bool bad_redir_trap(struct kvm_vcpu *vcpu,
 	.val = v,				\
 }
 
+#define EL2_REG_FILTERED(name, acc, rst, v, filter) {	\
+	SYS_DESC(SYS_##name),			\
+	.access = acc,				\
+	.reset = rst,				\
+	.reg = name,				\
+	.visibility = filter,			\
+	.val = v,				\
+}
+
 #define EL2_REG_VNCR(name, rst, v)	EL2_REG(name, bad_vncr_trap, rst, v)
 #define EL2_REG_REDIR(name, rst, v)	EL2_REG(name, bad_redir_trap, rst, v)
 
@@ -2803,8 +2812,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	EL2_REG_VNCR(HFGITR_EL2, reset_val, 0),
 	EL2_REG_VNCR(HACR_EL2, reset_val, 0),
 
-	{ SYS_DESC(SYS_ZCR_EL2), .access = access_zcr_el2, .reset = reset_val,
-	  .visibility = sve_el2_visibility, .reg = ZCR_EL2 },
+	EL2_REG_FILTERED(ZCR_EL2, access_zcr_el2, reset_val, 0,
+			 sve_el2_visibility),
 
 	EL2_REG_VNCR(HCRX_EL2, reset_val, 0),
 

-- 
2.39.2