Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756923Ab3GQTHh (ORCPT ); Wed, 17 Jul 2013 15:07:37 -0400 Received: from mail-pd0-f169.google.com ([209.85.192.169]:40188 "EHLO mail-pd0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752325Ab3GQTHf convert rfc822-to-8bit (ORCPT ); Wed, 17 Jul 2013 15:07:35 -0400 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Subject: Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes) causes hang From: Xiao Guangrong In-Reply-To: <20130717165743.GA357@x4> Date: Thu, 18 Jul 2013 03:07:11 +0800 Cc: Gleb Natapov , kvm@vger.kernel.org, Xiao Guangrong , Marcelo Tosatti , Paolo Bonzini , linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8BIT Message-Id: References: <20130717163215.GA359@x4> <20130717164232.GI13732@redhat.com> <20130717165743.GA357@x4> To: Markus Trippelsdorf X-Mailer: Apple Mail (2.1508) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3563 Lines: 96 Ouch! The guest is hang when boot from ubuntu iso, i bisected the code and found it is caused by: cad55f1aed000db46dfd1b5706707f33624d8604 is the first bad commit commit cad55f1aed000db46dfd1b5706707f33624d8604 Author: Cornelia Huck Date: Wed Jul 3 16:30:53 2013 +0200 KVM: kvm-io: support cookies Add new functions kvm_io_bus_{read,write}_cookie() that allows users of the kvm io infrastructure to use a cookie value to speed up lookup of a device on an io bus. Signed-off-by: Cornelia Huck Signed-off-by: Paolo Bonzini Now, i have reset the code behind this commit and continue to install the guest?... On Jul 18, 2013, at 12:57 AM, Markus Trippelsdorf wrote: > On 2013.07.17 at 19:42 +0300, Gleb Natapov wrote: >> On Wed, Jul 17, 2013 at 06:32:15PM +0200, Markus Trippelsdorf wrote: >>> The following commit: >>> commit f8f559422b6c6a05469dfde614b67789b6142cb5 >>> Author: Xiao Guangrong >>> Date: Fri Jun 7 16:51:26 2013 +0800 >>> >>> KVM: MMU: fast invalidate all mmio sptes >>> >>> causes my kvm qemu qcow2 images to hang when they switch from the boot >>> console to the desktop. For example: >>> qemu-system-x86_64 -enable-kvm -net nic,vlan=0,model=virtio -net user -drive file=ubuntu,if=virtio,cache=unsafe -smp 2 -m 1024 >>> boots normally at first, but then hangs as soon as Xorg gets started.` >>> >> Which guest is is exactly and how reproducible is this? > > Ubuntu 12.04. > It's 100% reproducible or else it wouldn't have been so easily > bisectable. > >>> Perf top shows: >>> 20.99% [kernel] [k] svm_vcpu_run >>> 17.24% [kernel] [k] handle_mmio_page_fault_common >>> 15.61% [kernel] [k] kvm_arch_vcpu_ioctl_run >>> 12.49% [kernel] [k] fast_page_fault.part.78 >>> >>> I'm running: >>> QEMU emulator version 1.4.2 >>> on an AMD PhenomII X4 CPU. >>> >> What is the output of "cat /proc/cpuinfo"? > > > processor : 0 > vendor_id : AuthenticAMD > cpu family : 16 > model : 4 > model name : AMD Phenom(tm) II X4 955 Processor > stepping : 2 > microcode : 0x10000db > cpu MHz : 800.000 > cache size : 512 KB > physical id : 0 > siblings : 4 > core id : 0 > cpu cores : 4 > apicid : 0 > initial apicid : 0 > fpu : yes > fpu_exception : yes > cpuid level : 5 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save > bogomips : 6424.73 > TLB size : 1024 4K pages > clflush size : 64 > cache_alignment : 64 > address sizes : 48 bits physical, 48 bits virtual > power management: ts ttp tm stc 100mhzsteps hwpstate > ... > *4 > > -- > Markus > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/