linux-kernel - Re: [PATCH Part1 RFC v2 07/20] x86/sev: Define error codes for reason set 1.

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Date:   Tue, 18 May 2021 13:05:16 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        tglx@...utronix.de, jroedel@...e.de, thomas.lendacky@....com,
        pbonzini@...hat.com, mingo@...hat.com, dave.hansen@...el.com,
        rientjes@...gle.com, seanjc@...gle.com, peterz@...radead.org,
        hpa@...or.com, tony.luck@...el.com
Subject: Re: [PATCH Part1 RFC v2 07/20] x86/sev: Define error codes for
 reason set 1.

On Fri, Apr 30, 2021 at 07:16:03AM -0500, Brijesh Singh wrote:

> Subject: Re: [PATCH Part1 RFC v2 07/20] x86/sev: Define error codes for reason set 1.

That patch title needs to be more generic, perhaps

"...: Define the Linux-specific guest termination reasons"

> diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h
> index 07b8612bf182..733fca403ae5 100644
> --- a/arch/x86/include/asm/sev-common.h
> +++ b/arch/x86/include/asm/sev-common.h
> @@ -128,4 +128,9 @@ struct __packed snp_page_state_change {
>  
>  #define GHCB_RESP_CODE(v)		((v) & GHCB_MSR_INFO_MASK)
>  
> +/* Linux specific reason codes (used with reason set 1) */
> +#define GHCB_TERM_REGISTER		0	/* GHCB GPA registration failure */
> +#define GHCB_TERM_PSC			1	/* Page State Change faiilure */

"failure"

> +#define GHCB_TERM_PVALIDATE		2	/* Pvalidate failure */
> +
>  #endif
> diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
> index 874f911837db..3f9b06a04395 100644
> --- a/arch/x86/kernel/sev-shared.c
> +++ b/arch/x86/kernel/sev-shared.c
> @@ -32,7 +32,7 @@ static bool __init sev_es_check_cpu_features(void)
>  	return true;
>  }
>  
> -static void __noreturn sev_es_terminate(unsigned int reason)
> ++static void __noreturn sev_es_terminate(unsigned int set, unsigned int reason)
   ^

Do you see the '+' above?

In file included from arch/x86/kernel/sev.c:462:
arch/x86/kernel/sev-shared.c:37:1: error: expected identifier or ‘(’ before ‘+’ token
   37 | +static void __noreturn sev_es_terminate(unsigned int set, unsigned int reason)
      | ^
arch/x86/kernel/sev-shared.c: In function ‘do_vc_no_ghcb’:
arch/x86/kernel/sev-shared.c:245:2: error: implicit declaration of function ‘sev_es_terminate’; did you mean ‘seq_buf_terminate’? [-Werror=implicit-function-declaration]
  245 |  sev_es_terminate(0, GHCB_SEV_ES_REASON_GENERAL_REQUEST);
      |  ^~~~~~~~~~~~~~~~
      |  seq_buf_terminate
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:272: arch/x86/kernel/sev.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [scripts/Makefile.build:515: arch/x86/kernel] Error 2
make: *** [Makefile:1839: arch/x86] Error 2
make: *** Waiting for unfinished jobs....

-- 
Regards/Gruss,
    Boris.

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