From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vitaly Kuznetsov Subject: Re: Redhat 6 VM crash on Xen when cpu number reaches 64 Date: Fri, 14 Aug 2015 14:17:53 +0200 Message-ID: <87tws2vzbi.fsf@vitty.brq.redhat.com> References: <55CDB13A.9050802@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1ZQDvr-00081a-31 for xen-devel@lists.xenproject.org; Fri, 14 Aug 2015 12:17:59 +0000 In-Reply-To: <55CDB13A.9050802@huawei.com> (ouyangzhaowei@huawei.com's message of "Fri, 14 Aug 2015 17:13:30 +0800") List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "Ouyangzhaowei (Charles)" Cc: xen-devel@lists.xenproject.org, jinjian@huawei.com, dingweiping@huawei.com List-Id: xen-devel@lists.xenproject.org "Ouyangzhaowei (Charles)" writes: >>> Hi all: >>> >>> Now a days, we tested Redhat 6.2(6.4) on Xen(version 4.1.2). >>> If we config the cpu number more than 32, it'll show 32 in >>> the VM, and if we config it 64 cpus, the VM will crash and >>> the log is list below. >>> >>> Can someone tell us why is this happening? >> >> Old RHEL6 kernels don't have support for VCPU info placement for PVHVM >> (VCPUOP_register_vcpu_info call) so only 32 VCPUs are supported. This is >> fixed in current 6.6.z kernel. >> > > Hi Vitaly, > > Is there any official announcement of this on Redhat website? > We did not find any explanation about this, can you help us to find > it? As far as I can see this bug didn't make it to the release notes, it is included in the following errata (6.7 kernel update): https://rhn.redhat.com/errata/RHSA-2015-1272.html You can see upstream commit ids in my reply to Konrad: http://lists.xenproject.org/archives/html/xen-devel/2015-08/msg01384.html -- Vitaly