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[156.151.31.85]) by mx.google.com with ESMTPS id t9si8689398itj.76.2019.05.13.08.18.12 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 08:18:12 -0700 (PDT) Received-SPF: pass (google.com: domain of liran.alon@oracle.com designates 156.151.31.85 as permitted sender) client-ip=156.151.31.85; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=s+iOIvIz; spf=pass (google.com: domain of liran.alon@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=liran.alon@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com 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 x4DF9oxF029760; Mon, 13 May 2019 15:17:54 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2018-07-02; bh=7dwMUJzRttDvJYwhnTS2pvQini1VnZvpMgmhpc63TNI=; b=s+iOIvIzPv8p+qdn5Lp87nwsGe8piEJpWQ3OZW90Gqa7nfhqwc5jki1ocfhV8tfSYzyW ERQWmQkk0Drp6M39yqnyF2g5hWg8ckFsDEpZVMimRtrkJrFmN42X06Mw0JuVxtOyFXFQ ZM3y1OBAffh3lZwD1UORvYQyqw2FVoBLsR/ICZWoOVz30V9X8ZVIhod3gTSiGDDdcVAE BIDNG0vWG0mrq+wPCV1tkOBE/AwOEA2iQNd9Wj0ltYBVmaSz96NorsvT640eIhHYb7gR dKR2h7IcfhTPGL9nD1ygG8RWeV0LY/JCpb8KY+qu5uHfxDcfChNM5u9rLq4YgfLdHDAE yw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 2sdq1q7m9k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 May 2019 15:17:53 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x4DFHYQU140196; Mon, 13 May 2019 15:17:53 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 2sdnqj1a07-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 May 2019 15:17:53 +0000 Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x4DFHo3J020928; Mon, 13 May 2019 15:17:50 GMT Received: from [10.30.3.22] (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 13 May 2019 08:17:49 -0700 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.1 \(3445.4.7\)) Subject: Re: [RFC KVM 01/27] kernel: Export memory-management symbols required for KVM address space isolation From: Liran Alon In-Reply-To: <20190513151550.GZ2589@hirez.programming.kicks-ass.net> Date: Mon, 13 May 2019 18:17:42 +0300 Cc: Alexandre Chartre , pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, jwadams@google.com Content-Transfer-Encoding: quoted-printable Message-Id: <6CAE8F45-E2C0-453F-B2C8-12D9BBE6B8D7@oracle.com> References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com> <1557758315-12667-2-git-send-email-alexandre.chartre@oracle.com> <20190513151550.GZ2589@hirez.programming.kicks-ass.net> To: Peter Zijlstra X-Mailer: Apple Mail (2.3445.4.7) X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9255 signatures=668686 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=8.0.1-1810050000 definitions=main-1905130105 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9255 signatures=668686 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=8.0.1-1810050000 definitions=main-1905130105 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On 13 May 2019, at 18:15, Peter Zijlstra wrote: >=20 > On Mon, May 13, 2019 at 04:38:09PM +0200, Alexandre Chartre wrote: >> From: Liran Alon >>=20 >> Export symbols needed to create, manage, populate and switch >> a mm from a kernel module (kvm in this case). >>=20 >> This is a hacky way for now to start. >> This should be changed to some suitable memory-management API. >=20 > This should not be exported at all, ever, end of story. >=20 > Modules do not get to play with address spaces like that. I agree=E2=80=A6 No doubt about that. This should never be merged like = this. It=E2=80=99s just to have an initial PoC of the concept so we can: 1) Messure performance impact of concept. 2) Get feedback on appropriate design and APIs from community. -Liran