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: Thu, 26 Mar 2015 14:14:39 +0100 Message-ID: <87vbhnq4sg.fsf@vitty.brq.redhat.com> References: <5513AD6E.1010606@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 1Yb7cV-00037F-5L for xen-devel@lists.xenproject.org; Thu, 26 Mar 2015 13:14:47 +0000 In-Reply-To: <5513AD6E.1010606@huawei.com> (Ouyang Zhaowei's message of "Thu, 26 Mar 2015 14:55:42 +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: "Ouyang Zhaowei (Charles)" Cc: xen-devel , Dingweiping , yanqiangjun@huawei.com, huanglinglong@huawei.com List-Id: xen-devel@lists.xenproject.org "Ouyang Zhaowei (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. > > 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