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 <cornelia.huck@xxxxxxxxxx>
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 <cornelia.huck@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
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 <markus@xxxxxxxxxxxxxxx> 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 <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
>>> 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
> --
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