From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Ouyangzhaowei (Charles)" Subject: Re: Redhat 6 VM crash on Xen when cpu number reaches 64 Date: Fri, 14 Aug 2015 17:13:30 +0800 Message-ID: <55CDB13A.9050802@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1ZQB3i-0004jG-Rh for xen-devel@lists.xenproject.org; Fri, 14 Aug 2015 09:13:54 +0000 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: vkuznets@redhat.com Cc: xen-devel@lists.xenproject.org, jinjian@huawei.com, dingweiping@huawei.com List-Id: xen-devel@lists.xenproject.org >> 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? thanks very much >> >> thanks >> >> ===============================crash log================================= >> CPU: CPU feature rdtscp disabled on xen guest >> CPU: CPU feature constant_tsc disabled on xen guest >> mce: CPU supports 0 MCE banks >> #32 >> CPU32: Stuck ?? >> #33 >> CPU33: Stuck ?? > > ... > > -- > Vitaly