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Mon, 30 Nov 2020 19:46:05 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3020.oracle.com with ESMTP id 3540ewyxm4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 30 Nov 2020 19:46:05 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0AUJk3w5014859; Mon, 30 Nov 2020 19:46:04 GMT Received: from [192.168.0.108] (/70.36.60.91) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 30 Nov 2020 11:46:03 -0800 Subject: Re: [RFC] ich9:cpuhp: add support for cpu hot-unplug with SMI broadcast enabled To: Laszlo Ersek , Igor Mammedov References: <20201124122507.1014839-1-imammedo@redhat.com> <20640581-e37d-8783-451c-22627aabb77f@oracle.com> <20201127123356.7b1349d8@redhat.com> <3bad9b8e-6de1-37d4-8ac4-a8432885eb14@redhat.com> <8cc8c873-5057-29af-5c6e-ee43e5fa035c@oracle.com> From: Ankur Arora Message-ID: <930a2917-866c-fb28-5bf6-7b74b6c76869@oracle.com> Date: Mon, 30 Nov 2020 11:45:59 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9821 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 malwarescore=0 phishscore=0 suspectscore=0 bulkscore=0 spamscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011300128 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9821 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 spamscore=0 adultscore=0 mlxscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011300127 Received-SPF: pass client-ip=141.146.126.79; envelope-from=ankur.a.arora@oracle.com; helo=aserp2130.oracle.com X-Spam_score_int: -58 X-Spam_score: -5.9 X-Spam_bar: ----- X-Spam_report: (-5.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.496, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2020-11-30 8:58 a.m., Laszlo Ersek wrote: > On 11/28/20 00:48, Ankur Arora wrote: > >> It is possible that there are CPUs with bits for both is_inserting and >> is_removing. In that case QemuCpuhpCollectApicIds() would put them in the >> PluggedApicIds array and the unplug eventually happens in the next >> firmware invocation. >> >> If a CPU has both is_inserting and fw_remove set, the firmware processes >> the >> hotplug in that invocation and the unplug happens whenever the OSPM >> triggers >> the firmware next. > > If these corner cases will actually work (I'm somewhat doubtful), that > will be really great. Heh, yeah. That's a big if. I'll see if I can hit it in my testing. Thanks Ankur