From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=pass header.i=@oracle.com header.s=corp-2019-08-05 header.b=a4P/i/fy; spf=pass (domain: oracle.com, ip: 156.151.31.85, mailfrom: boris.ostrovsky@oracle.com) Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) by groups.io with SMTP; Fri, 16 Aug 2019 15:43:50 -0700 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7GMhntp078190; Fri, 16 Aug 2019 22:43:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2019-08-05; bh=916CL3b1b9DSNsTveTULhIMg+bYNmvZOD/N+ZFVCZ1k=; b=a4P/i/fygzuUL5H++vqyEKx1WOwrZ6guNUgLot0XCwf0b3cIa1cT8qhgnbb+UQe6kTRY LqEyyI+5+ER3iSkNvPSL2TYzr2DnpdFRuSyZH47c3g3EDGROxzjCSD9AHSbuOsjW+qdY uF83oil2u1myMbb5yWrURtFmIJ4QA8w7kgAUngDRusk8Dz2NEQl2J0sQ6kB3CLDaM0/K ftYYBOQkzOIVHBwHbvY/VRVyTBMt3x1MGacrrsNzIuusfGBLVw/6GR/Md4Jn2NBsq2jW YTQoPUG/V4caa69hVqnSboURp41LXAylA9t2y7ePZXxgRRzwRcngfMC4hO163KnbGz84 cA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 2u9pjr2ru3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Aug 2019 22:43:49 +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 x7GMhIQJ134437; Fri, 16 Aug 2019 22:43:49 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2udgr3d2ex-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Aug 2019 22:43:49 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x7GMhkB8028066; Fri, 16 Aug 2019 22:43:46 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 16 Aug 2019 15:43:46 -0700 Subject: Re: [POC Seabios PATCH] seabios: use isolated SMM address space for relocation To: Igor Mammedov , qemu-devel@nongnu.org Cc: "Chen, Yingwen" , edk2-devel-groups-io , Phillip Goerl , "Yao, Jiewen" , "Nakajima, Jun" , edk2-rfc-groups-io , Laszlo Ersek , Joao Marcal Lemos Martins , pbonzini@redhat.com References: <20190816112407.28180-1-imammedo@redhat.com> <20190816112407.28180-3-imammedo@redhat.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190816112407.28180-3-imammedo@redhat.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9351 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908160232 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9351 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908160232 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US On 8/16/19 7:24 AM, Igor Mammedov wrote: > for purpose of demo SMRAM (at 0x30000) is aliased at a0000 in system address space > for easy initialization of SMI entry point. > Here is resulting debug output showing that RAM at 0x30000 is not affected > by SMM and only RAM in SMM adderss space is modified: > > init smm > smm_relocate: before relocaten > smm_relocate: RAM codeentry 0 > smm_relocate: RAM cpu.i64.smm_base 0 > smm_relocate: SMRAM codeentry f000c831eac88c > smm_relocate: SMRAM cpu.i64.smm_base 0 > handle_smi cmd=0 smbase=0x00030000 > smm_relocate: after relocaten > smm_relocate: RAM codeentry 0 > smm_relocate: RAM cpu.i64.smm_base 0 > smm_relocate: SMRAM codeentry f000c831eac88c > smm_relocate: SMRAM cpu.i64.smm_base a0000 I most likely don't understand how this is supposed to work but aren't we here successfully reading SMRAM from non-SMM context, something we are not supposed to be able to do? -boris