Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756644Ab3GQQ5r (ORCPT ); Wed, 17 Jul 2013 12:57:47 -0400 Received: from ud10.udmedia.de ([194.117.254.50]:50603 "EHLO mail.ud10.udmedia.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756574Ab3GQQ5p (ORCPT ); Wed, 17 Jul 2013 12:57:45 -0400 Date: Wed, 17 Jul 2013 18:57:43 +0200 From: Markus Trippelsdorf To: Gleb Natapov Cc: kvm@vger.kernel.org, Xiao Guangrong , Marcelo Tosatti , Paolo Bonzini , linux-kernel@vger.kernel.org Subject: Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes) causes hang Message-ID: <20130717165743.GA357@x4> References: <20130717163215.GA359@x4> <20130717164232.GI13732@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130717164232.GI13732@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2490 Lines: 69 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 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/