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Date: Wed, 12 Sep 2012 10:13:45 +0200 From: Jiri Slaby <jslaby@...e.cz> To: Avi Kivity <avi@...hat.com> CC: Jiri Slaby <jirislaby@...il.com>, Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: qemu-kvm loops after kernel udpate On 09/12/2012 10:06 AM, Avi Kivity wrote: > On 09/11/2012 10:41 PM, Jiri Slaby wrote: >> On 09/11/2012 09:03 PM, Marcelo Tosatti wrote: >>> On Tue, Sep 11, 2012 at 08:11:36PM +0200, Jiri Slaby wrote: >>>> Hi, >>>> >>>> it looks like an update from next-20120824 to next-20120910 makes kvm >>>> defunct. When I try to run qemu, it loops forever without printing >>>> anything on the monitor. >>>> >>>> -no-kvm makes it indeed work. >>>> >>>> Cmdline I use: >>>> qemu-kvm -k en-us -usbdevice tablet -balloon virtio -hda IMAGE -smp 2 -m >>>> 1000M -net user -net nic,model=e1000 -usb -serial pty >>>> >>>> Before I start investigating further, like biscection, is this a known >>>> issue already and fix available somewhere? >>> >>> Its not a known issue. 'info registers' (for both vcpus) and >>> 'x /20i $eip' might help track it down. >> >> I don't think it's in a state with something loaded. >> >> (qemu) cpu 0 >> (qemu) info registers >> EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000623 >> ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000 >> EIP=0000fff0 EFL=00010002 [-------] CPL=3 II=0 A20=1 SMM=0 HLT=0 >> ES =0000 00000000 0000ffff 00009300 >> CS =f000 000f0000 0000ffff 0000f300 > > This is before the first instruction is executed. > > You're on an Intel host, yes? Yes. processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz stepping : 11 microcode : 0xba ... flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm tpr_shadow vnmi flexpriority > Please provide the output of vmxcap > (http://goo.gl/c5lUO), pin-based controls External interrupt exiting yes NMI exiting yes Virtual NMIs yes Activate VMX-preemption timer no primary processor-based controls Interrupt window exiting yes Use TSC offsetting yes HLT exiting yes INVLPG exiting yes MWAIT exiting yes RDPMC exiting yes RDTSC exiting yes CR3-load exiting forced CR3-store exiting forced CR8-load exiting yes CR8-store exiting yes Use TPR shadow yes NMI-window exiting yes MOV-DR exiting yes Unconditional I/O exiting yes Use I/O bitmaps yes Monitor trap flag no Use MSR bitmaps yes MONITOR exiting yes PAUSE exiting yes Activate secondary control yes secondary processor-based controls Virtualize APIC accesses yes Enable EPT no Descriptor-table exiting no Virtualize x2APIC mode no Enable VPID no WBINVD exiting no Unrestricted guest no PAUSE-loop exiting no RDRAND exiting no Enable INVPCID no Enable VM functions no VM-Exit controls Save debug controls forced Host address-space size yes Load IA32_PERF_GLOBAL_CTRL no Acknowledge interrupt on exit yes Save IA32_PAT no Load IA32_PAT no Save IA32_EFER no Load IA32_EFER no Save VMX-preemption timer value no VM-Entry controls Load debug controls forced IA-64 mode guest yes Entry to SMM yes Deactivate dual-monitor treatment yes Load IA32_PERF_GLOBAL_CTRL no Load IA32_PAT no Load IA32_EFER no Miscellaneous data VMX-preemption timer scale (log2) 0 Store EFER.LMA into IA-32e mode guest control no HLT activity state yes Shutdown activity state yes Wait-for-SIPI activity state yes Number of CR3-target values 4 MSR-load/store count recommenation 0 IA32_SMM_MONITOR_CTL[2] can be set to 1 no MSEG revision identifier 0 VPID and EPT capabilities Execute-only EPT translations no Page-walk length 4 no Paging-structure memory type UC no Paging-structure memory type WB no 2MB EPT pages no 1GB EPT pages no INVEPT supported no EPT accessed and dirty flags no Single-context INVEPT no All-context INVEPT no INVVPID supported no Individual-address INVVPID no Single-context INVVPID no All-context INVVPID no Single-context-retaining-globals INVVPID no VM Functions EPTP Switching no > and a snapshot of kvm_stat while the guest is hung. kvm statistics exits 6778198 615942 host_state_reload 1988 187 irq_exits 1523 138 mmu_cache_miss 4 0 fpu_reload 1 0 thanks, -- js suse labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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