linux-kernel - Re: [PATCH v4 00/12] Unify TDCALL/SEAMCALL and TDVMCALL assembly

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Date:   Mon, 11 Sep 2023 22:29:59 +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>,
        "pbonzini@...hat.com" <pbonzini@...hat.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>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "n.borisov.lkml@...il.com" <n.borisov.lkml@...il.com>
Subject: Re: [PATCH v4 00/12] Unify TDCALL/SEAMCALL and TDVMCALL assembly

On Mon, 2023-09-11 at 19:08 +0200, Paolo Bonzini wrote:
> On 8/15/23 13:01, Kai Huang wrote:
> > Hi Peter, Kirill,
> > 
> > This series unifies the assembly code for TDCALL/SEAMCALL and TDVMCALL.
> > Now all of them use one singe TDX_MODULE_CALL asm macro.  More
> > information please see cover letter of v2 (see link below).
> > 
> > Tested by booting TDX guest, initializing TDX module, and running TDX
> > guest successfully, all with this series applied.
> 
> Not sure it if's new in this version but I'm seeing
> 
>      WARNING: modpost: EXPORT symbol "__seamcall_ret" [vmlinux] version ...
>      Is "__seamcall_ret" prototyped in <asm/asm-prototypes.h>?
>      WARNING: modpost: EXPORT symbol "__seamcall" [vmlinux] version ...
>      Is "__seamcall" prototyped in <asm/asm-prototypes.h>?
>      WARNING: modpost: EXPORT symbol "__seamcall_saved_ret" [vmlinux] version ...
>      Is "__seamcall_saved_ret" prototyped in <asm/asm-prototypes.h>?
> 
> which is fixed by
> 
> diff --git a/arch/x86/include/asm/asm-prototypes.h b/arch/x86/include/asm/asm-prototypes.h
> index 8f80de627c60..eff5252e9c86 100644
> --- a/arch/x86/include/asm/asm-prototypes.h
> +++ b/arch/x86/include/asm/asm-prototypes.h
> @@ -6,6 +6,7 @@
>   #include <asm/page.h>
>   #include <asm/checksum.h>
>   #include <asm/mce.h>
> +#include <asm/tdx.h>
>   
>   #include <asm-generic/asm-prototypes.h>
>   

Thanks Paolo!

I never met this issue, not even from LKP.  Do you happen to know which Kconfig
option can trigger this?  Or would you mind sharing your .config?