linux-kernel - Re: [PATCH v4 19/28] KVM: TDX: Derive error argument names from the local variable names

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Message-ID: <326290aa-def6-478c-9ef3-1649e027e5d5@linux.intel.com>
Date: Fri, 31 Oct 2025 17:00:48 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
 Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>,
 Huacai Chen <chenhuacai@...nel.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>, Anup Patel <anup@...infault.org>,
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
 Albert Ou <aou@...s.berkeley.edu>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Janosch Frank <frankja@...ux.ibm.com>,
 Claudio Imbrenda <imbrenda@...ux.ibm.com>,
 Paolo Bonzini <pbonzini@...hat.com>, "Kirill A. Shutemov" <kas@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
 kvm@...r.kernel.org, loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
 linux-riscv@...ts.infradead.org, x86@...nel.org, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
 Kai Huang <kai.huang@...el.com>, Michael Roth <michael.roth@....com>,
 Yan Zhao <yan.y.zhao@...el.com>, Vishal Annapurve <vannapurve@...gle.com>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>,
 Ackerley Tng <ackerleytng@...gle.com>
Subject: Re: [PATCH v4 19/28] KVM: TDX: Derive error argument names from the
 local variable names

On 10/31/2025 4:09 AM, Sean Christopherson wrote:
> When printing SEAMCALL errors, use the name of the variable holding an
> error parameter instead of the register from whence it came, so that flows
> which use descriptive variable names will similarly print descriptive
> error messages.
>
> Suggested-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>

> ---
>   arch/x86/kvm/vmx/tdx.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index 5e6f2d8b6014..63d4609cc3bc 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -41,14 +41,15 @@
>   #define TDX_BUG_ON(__err, __fn, __kvm)				\
>   	__TDX_BUG_ON(__err, #__fn, __kvm, "%s", "")
>   
> -#define TDX_BUG_ON_1(__err, __fn, __rcx, __kvm)			\
> -	__TDX_BUG_ON(__err, #__fn, __kvm, ", rcx 0x%llx", __rcx)
> +#define TDX_BUG_ON_1(__err, __fn, a1, __kvm)			\
> +	__TDX_BUG_ON(__err, #__fn, __kvm, ", " #a1 " 0x%llx", a1)
>   
> -#define TDX_BUG_ON_2(__err, __fn, __rcx, __rdx, __kvm)		\
> -	__TDX_BUG_ON(__err, #__fn, __kvm, ", rcx 0x%llx, rdx 0x%llx", __rcx, __rdx)
> +#define TDX_BUG_ON_2(__err, __fn, a1, a2, __kvm)	\
> +	__TDX_BUG_ON(__err, #__fn, __kvm, ", " #a1 " 0x%llx, " #a2 " 0x%llx", a1, a2)
>   
> -#define TDX_BUG_ON_3(__err, __fn, __rcx, __rdx, __r8, __kvm)	\
> -	__TDX_BUG_ON(__err, #__fn, __kvm, ", rcx 0x%llx, rdx 0x%llx, r8 0x%llx", __rcx, __rdx, __r8)
> +#define TDX_BUG_ON_3(__err, __fn, a1, a2, a3, __kvm)	\
> +	__TDX_BUG_ON(__err, #__fn, __kvm, ", " #a1 " 0x%llx, " #a2 ", 0x%llx, " #a3 " 0x%llx", \
> +		     a1, a2, a3)
>   
>   
>   bool enable_tdx __ro_after_init;