linux-kernel - Re: [PATCH 2/2] KVM: TDX: Remove redundant definitions of TDX_TD_ATTR

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Message-ID: <aG0uyLwxqfKSX72s@google.com>
Date: Tue, 8 Jul 2025 07:44:24 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Rick P Edgecombe <rick.p.edgecombe@...el.com>
Cc: Xiaoyao Li <xiaoyao.li@...el.com>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, 
	"linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>, Kai Huang <kai.huang@...el.com>, 
	Yan Y Zhao <yan.y.zhao@...el.com>, 
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Reinette Chatre <reinette.chatre@...el.com>, 
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>, 
	"mingo@...hat.com" <mingo@...hat.com>, Isaku Yamahata <isaku.yamahata@...el.com>, 
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>, "tglx@...utronix.de" <tglx@...utronix.de>, 
	"hpa@...or.com" <hpa@...or.com>, Tony Lindgren <tony.lindgren@...el.com>, "bp@...en8.de" <bp@...en8.de>, 
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 2/2] KVM: TDX: Remove redundant definitions of TDX_TD_ATTR_*

On Tue, Jul 08, 2025, Rick P Edgecombe wrote:
> On Tue, 2025-07-08 at 07:03 -0700, Sean Christopherson wrote:
> > > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> > > index c539c2e6109f..efb7d589b672 100644
> > > --- a/arch/x86/kvm/vmx/tdx.c
> > > +++ b/arch/x86/kvm/vmx/tdx.c
> > > @@ -62,7 +62,7 @@ void tdh_vp_wr_failed(struct vcpu_tdx *tdx, char *uclass,
> > > char *op, u32 field,
> > >   	pr_err("TDH_VP_WR[%s.0x%x]%s0x%llx failed: 0x%llx\n", uclass,
> > > field, op, val, err);
> > >   }
> > >   
> > > -#define KVM_SUPPORTED_TD_ATTRS (TDX_TD_ATTR_SEPT_VE_DISABLE)
> > > +#define KVM_SUPPORTED_TD_ATTRS (TDX_ATTR_SEPT_VE_DISABLE)
> > 
> > Would it make sense to rename KVM_SUPPORTED_TD_ATTRS to
> > KVM_SUPPORTED_TDX_ATTRS?
> > The names from common code lack the TD qualifier, and I think it'd be helpful
> > for
> > readers to have have TDX in the name (even though I agree "TD" is more
> > precise).
> 
> It's useful to know that these are per-TD attributes and not per-TDX module.
> Especially for TDX_TD_ATTR_DEBUG. I kind of prefer the KVM naming scheme that is
> removed in this patch.

Heh, as does Xiaoyao, and me too.  I thought I was just being nitpicky :-)

Though in that case, I think I'd prefer KVM_SUPPORTED_TDX_TD_ATTRS.