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Wed, 13 Nov 2019 16:35:12 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xADGQtgE155926; Wed, 13 Nov 2019 16:35:12 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 2w8g17sna1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Nov 2019 16:35:11 +0000 Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xADGYwpb007489; Wed, 13 Nov 2019 16:34:58 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 13 Nov 2019 08:34:58 -0800 Subject: Re: [Xen-devel] [PATCH 2/3] xen/mcelog: add PPIN to record when available To: Jan Beulich Cc: Juergen Gross , the arch/x86 maintainers , "xen-devel@lists.xenproject.org" , lkml References: <9466c080-9926-0d9f-435a-ddf0c3ec7812@oracle.com> <5f8bbcb2-2eb9-c9f4-622a-43a6d0814b94@suse.com> From: Boris Ostrovsky Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <5f8bbcb2-2eb9-c9f4-622a-43a6d0814b94@suse.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9440 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=832 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911130146 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9440 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=902 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911130146 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/13/19 8:44 AM, Jan Beulich wrote: > On 13.11.2019 01:11, Boris Ostrovsky wrote: >> On 11/11/19 9:46 AM, Jan Beulich wrote: >>> --- 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. > Certain Fam17 ones, Rome in particular (which is where I've > tested this). I was looking at Naples, can't find Rome on AMD's page. > >>> --- 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? > That's a question to whoever put it there. There look to have > been decisions (see also patch 1) to have the Linux clones of > Xen's public headers deviate far more from their original > than I would consider reasonable. Yes, this goes back to when the file was first created. Reviewed-by: Boris Ostrovsky (but if you want to move non-interface parts into, say, drivers/xen/mcelog.h I won't stand in your way ;-) )