Re: [PATCH v2 1/5] arm64/sysreg: Add HDBSS related register information
From: Tian Zheng
Date: Thu Nov 27 2025 - 06:48:47 EST
On 2025/11/22 20:40, Marc Zyngier wrote:
On Fri, 21 Nov 2025 09:23:38 +0000,Sure, I will move VTCR_EL2_HDBSS into the sysreg description file
Tian Zheng <zhengtian10@xxxxxxxxxx> wrote:
From: eillon <yezhenyu2@xxxxxxxxxx>
The ARM architecture added the HDBSS feature and descriptions of
related registers (HDBSSBR/HDBSSPROD) in the DDI0601(ID121123) version,
add them to Linux.
Signed-off-by: eillon <yezhenyu2@xxxxxxxxxx>
Signed-off-by: Tian Zheng <zhengtian10@xxxxxxxxxx>
---
arch/arm64/include/asm/esr.h | 2 ++
arch/arm64/include/asm/kvm_arm.h | 1 +
arch/arm64/tools/sysreg | 28 ++++++++++++++++++++++++++++
3 files changed, 31 insertions(+)
diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index e1deed824464..a6f3cf0b9b86 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -159,6 +159,8 @@
#define ESR_ELx_CM (UL(1) << ESR_ELx_CM_SHIFT)
/* ISS2 field definitions for Data Aborts */
+#define ESR_ELx_HDBSSF_SHIFT (11)
+#define ESR_ELx_HDBSSF (UL(1) << ESR_ELx_HDBSSF_SHIFT)
#define ESR_ELx_TnD_SHIFT (10)
#define ESR_ELx_TnD (UL(1) << ESR_ELx_TnD_SHIFT)
#define ESR_ELx_TagAccess_SHIFT (9)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 1da290aeedce..b71122680a03 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -124,6 +124,7 @@
TCR_EL2_ORGN0_MASK | TCR_EL2_IRGN0_MASK)
/* VTCR_EL2 Registers bits */
+#define VTCR_EL2_HDBSS (1UL << 45)
I think it is time to convert VTCR_EL2 to the sysreg infrastructure
instead of adding extra bits here.
alongside VTCR_EL2.
M.