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Mon, 15 Jul 2019 15:16:55 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 2tq6mmb7uk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Jul 2019 15:16:54 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x6FFGrXs027551; Mon, 15 Jul 2019 15:16:53 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 15 Jul 2019 08:16:53 -0700 Subject: Re: [PATCH v7 5/5] x86/xen: Add "nopv" support for HVM guest To: Zhenzhong Duan , linux-kernel@vger.kernel.org Cc: xen-devel@lists.xenproject.org, jgross@suse.com, sstabellini@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de References: <1562846532-32152-1-git-send-email-zhenzhong.duan@oracle.com> <1562846532-32152-6-git-send-email-zhenzhong.duan@oracle.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: <1562846532-32152-6-git-send-email-zhenzhong.duan@oracle.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=9319 signatures=668688 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-1907150181 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9319 signatures=668688 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907150181 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/11/19 8:02 AM, Zhenzhong Duan wrote: > PVH guest needs PV extentions to work, so "nopv" parameter should be > ignored for PVH but not for HVM guest. > > If PVH guest boots up via the Xen-PVH boot entry, xen_pvh is set early, > we know it's PVH guest and ignore "nopv" parameter directly. > > If PVH guest boots up via the normal boot entry same as HVM guest, it's > hard to distinguish PVH and HVM guest at that time. In this case, we > have to panic early if PVH is detected and nopv is enabled to avoid a > worse situation later. > > Move xen_platform_hvm() after xen_hvm_guest_late_init() to avoid compile > error. > > Signed-off-by: Zhenzhong Duan > Cc: Boris Ostrovsky > Cc: Juergen Gross > Cc: Stefano Stabellini > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Borislav Petkov Reviewed-by: Boris Ostrovsky