linux-kernel - Re: [PATCH v2 1/5] arm64/sysreg: Add HDBSS related register information

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Message-ID: <54558610-1062-4632-a44c-d06443bdc736@huawei.com>
Date: Thu, 27 Nov 2025 19:48:38 +0800
From: Tian Zheng <zhengtian10@...wei.com>
To: Marc Zyngier <maz@...nel.org>, Tian Zheng <zhengtian10@...wei.com>
CC: <oliver.upton@...ux.dev>, <catalin.marinas@....com>, <corbet@....net>,
	<pbonzini@...hat.com>, <will@...nel.org>, <linux-kernel@...r.kernel.org>,
	<yuzenghui@...wei.com>, <wangzhou1@...ilicon.com>, <yezhenyu2@...wei.com>,
	<xiexiangyou@...wei.com>, <zhengchuan@...wei.com>, <joey.gouly@....com>,
	<kvmarm@...ts.linux.dev>, <kvm@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
	<suzuki.poulose@....com>
Subject: Re: [PATCH v2 1/5] arm64/sysreg: Add HDBSS related register
 information



On 2025/11/22 20:40, Marc Zyngier wrote:
> On Fri, 21 Nov 2025 09:23:38 +0000,
> Tian Zheng <zhengtian10@...wei.com> wrote:
>>
>> From: eillon <yezhenyu2@...wei.com>
>>
>> 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@...wei.com>
>> Signed-off-by: Tian Zheng <zhengtian10@...wei.com>
>> ---
>>   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.
> 
Sure, I will move VTCR_EL2_HDBSS into the sysreg description file
alongside VTCR_EL2.
> 	M.