linux-kernel - Re: [PATCH 2/3] xen/mcelog: add PPIN to record when available

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Date:   Tue, 12 Nov 2019 19:11:35 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Jan Beulich <jbeulich@...e.com>, Juergen Gross <jgross@...e.com>
Cc:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        lkml <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 2/3] xen/mcelog: add PPIN to record when available

On 11/11/19 9:46 AM, Jan Beulich wrote:
> This is to augment commit 3f5a7896a5 ("x86/mce: Include the PPIN in MCE
> records when available").
>
> I'm also adding "synd" and "ipid" fields to struct xen_mce, in an
> attempt to keep field offsets in sync with struct mce. These two fields
> won't get populated for now, though.
>
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
>
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -393,6 +393,8 @@
>  #define MSR_AMD_PSTATE_DEF_BASE		0xc0010064
>  #define MSR_AMD64_OSVW_ID_LENGTH	0xc0010140
>  #define MSR_AMD64_OSVW_STATUS		0xc0010141
> +#define MSR_AMD_PPIN_CTL		0xc00102f0
> +#define MSR_AMD_PPIN			0xc00102f1

Which processors are these defined for? I looked at a couple (fam 15h
and 17h) and didn't see those. And I don't see them in Linux.

>  #define MSR_AMD64_LS_CFG		0xc0011020
>  #define MSR_AMD64_DC_CFG		0xc0011022
>  #define MSR_AMD64_BU_CFG2		0xc001102a
> --- a/drivers/xen/mcelog.c
> +++ b/drivers/xen/mcelog.c
> @@ -253,6 +253,11 @@ static int convert_log(struct mc_info *m
>  		case MSR_IA32_MCG_CAP:
>  			m.mcgcap = g_physinfo[i].mc_msrvalues[j].value;
>  			break;
> +
> +		case MSR_PPIN:
> +		case MSR_AMD_PPIN:
> +			m.ppin = g_physinfo[i].mc_msrvalues[j].value;
> +			break;
>  		}
>  
>  	mic = NULL;
> --- a/include/xen/interface/xen-mca.h
> +++ b/include/xen/interface/xen-mca.h
> @@ -332,7 +332,11 @@ struct xen_mc {
>  };
>  DEFINE_GUEST_HANDLE_STRUCT(xen_mc);
>  
> -/* Fields are zero when not available */
> +/*
> + * Fields are zero when not available. Also, this struct is shared with
> + * userspace mcelog and thus must keep existing fields at current offsets.
> + * Only add new fields to the end of the structure
> + */
>  struct xen_mce {


Why is this structure is part of the interface?


-boris

>  	__u64 status;
>  	__u64 misc;
> @@ -353,6 +357,9 @@ struct xen_mce {
>  	__u32 socketid;	/* CPU socket ID */
>  	__u32 apicid;	/* CPU initial apic ID */
>  	__u64 mcgcap;	/* MCGCAP MSR: machine check capabilities of CPU */
> +	__u64 synd;	/* MCA_SYND MSR: only valid on SMCA systems */
> +	__u64 ipid;	/* MCA_IPID MSR: only valid on SMCA systems */
> +	__u64 ppin;	/* Protected Processor Inventory Number */
>  };
>  
>  /*