linux-kernel - Re: [PATCH 04/10] x86/tdx: Make macros of TDCALLs consistent with the spec

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Date:   Mon, 17 Jul 2023 00:57:39 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "nik.borisov@...e.com" <nik.borisov@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH 04/10] x86/tdx: Make macros of TDCALLs consistent with the
 spec

On Fri, 2023-07-14 at 15:28 +0300, Nikolay Borisov wrote:
> 
> On 12.07.23 г. 11:55 ч., Kai Huang wrote:
> > The TDX spec names all TDCALLs with prefix "TDG".  Currently, the kernel
> > doesn't follow such convention for the macros of those TDCALLs but uses
> > prefix "TDX_" for all of them.  Although it's arguable whether the TDX
> > spec names those TDCALLs properly, it's better for the kernel to follow
> > the spec when naming those macros.
> > 
> > Change all macros of TDCALLs to make them consistent with the spec.  As
> > a bonus, they get distinguished easily from the host-side SEAMCALLs,
> > which all have prefix "TDH".
> > 
> > No functional change intended.
> > 
> > Signed-off-by: Kai Huang <kai.huang@...el.com>
> > ---
> >   arch/x86/coco/tdx/tdx.c | 22 +++++++++++-----------
> >   1 file changed, 11 insertions(+), 11 deletions(-)
> > 
> > diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
> > index 5b8056f6c83f..de021df92009 100644
> > --- a/arch/x86/coco/tdx/tdx.c
> > +++ b/arch/x86/coco/tdx/tdx.c
> > @@ -15,11 +15,11 @@
> >   #include <asm/pgtable.h>
> >   
> >   /* TDX module Call Leaf IDs */
> > -#define TDX_GET_INFO			1
> > -#define TDX_GET_VEINFO			3
> > -#define TDX_GET_REPORT			4
> > -#define TDX_ACCEPT_PAGE			6
> > -#define TDX_WR				8
> > +#define TDG_VP_INFO			1
> > +#define TDG_VP_VEINFO_GET		3
> > +#define TDG_MR_REPORT			4
> > +#define TDG_MEM_PAGE_ACCEPT		6
> > +#define TDG_VM_WR			8
> >   
> What branch is this patch set based off? Because the existing TDX_GET_* 
> defines are in arch/x86/include/asm/shared/tdx.h due to ff40b5769a50f ?
> 

It was based on tip/x86/tdx, which didn't have above patch.  I'll rebase to the
Linus's tree for the next round since it now has all TDX patches anyway.