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Sun, 13 Sep 2020 17:25:32 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08DHPJHh104805; Sun, 13 Sep 2020 17:25:32 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3020.oracle.com with ESMTP id 33h87xvpq2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 13 Sep 2020 17:25:32 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 08DHPTvi030996; Sun, 13 Sep 2020 17:25:30 GMT Received: from [10.74.86.192] (/10.74.86.192) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sun, 13 Sep 2020 17:25:29 +0000 Subject: Re: [PATCH v3 04/11] x86/xen: add system core suspend and resume callbacks To: Anchal Agarwal , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, jgross@suse.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, kamatam@amazon.com, sstabellini@kernel.org, konrad.wilk@oracle.com, roger.pau@citrix.com, axboe@kernel.dk, davem@davemloft.net, rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz, peterz@infradead.org, eduval@amazon.com, sblbir@amazon.com, xen-devel@lists.xenproject.org, vkuznets@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dwmw@amazon.co.uk, benh@kernel.crashing.org References: <6b86a4bf71ee3e3e9b0bb00f594a4edc85da19a9.1598042152.git.anchalag@amazon.com> From: boris.ostrovsky@oracle.com Organization: Oracle Corporation Message-ID: <286ac56d-7fd2-66d5-bfcb-6a329afca3d6@oracle.com> Date: Sun, 13 Sep 2020 13:25:23 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.2.1 MIME-Version: 1.0 In-Reply-To: <6b86a4bf71ee3e3e9b0bb00f594a4edc85da19a9.1598042152.git.anchalag@amazon.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=9743 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 spamscore=0 adultscore=0 suspectscore=0 phishscore=0 malwarescore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009130158 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9743 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 spamscore=0 priorityscore=1501 suspectscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009130158 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 8/21/20 6:27 PM, Anchal Agarwal wrote: > From: Munehisa Kamata > > Add Xen PVHVM specific system core callbacks for PM > hibernation support. The callbacks suspend and resume > Xen primitives like shared_info, pvclock and grant table. > These syscore_ops are specifically for domU hibernation. > xen_suspend() calls syscore_suspend() during Xen suspend > operation however, during xen suspend lock_system_sleep() > lock is taken and thus system cannot trigger hibernation. > These system core callbacks will be called only from the > hibernation context. Well, they can be called from Xen suspend too, which is why you have the checks in the beginning. -boris