kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

[Paolo Pedaletti]

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ciao,
I have a problem to run a 64 bit intel guest inside a 64 bit intel host.
It doesn' boot.

host: Intel(R) Core(TM)2 CPU 6420  @ 2.13GHz
OS: ubuntu 8.10 64 bit
	($ file /bin/ls>/bin/ls: ELF 64-bit LSB xecutable, x86-64,...)
kvm-82

$ modinfo kvm
filename:       /lib/modules/2.6.27-9-server/extra/kvm.ko
license:        GPL
author:         Qumranet
version:        kvm-82
srcversion:     26E72577C6F752FF6FCE2AE
depends:
vermagic:       2.6.27-9-server SMP mod_unload modversions
parm:           oos_shadow:bool
parm:           msi2intx:bool

$ modinfo kvm_intel
filename:       /lib/modules/2.6.27-9-server/extra/kvm-intel.ko
license:        GPL
author:         Qumranet
version:        kvm-82
srcversion:     6F53E897CA902DDC25AC326
depends:        kvm
vermagic:       2.6.27-9-server SMP mod_unload modversions
parm:           bypass_guest_pf:bool
parm:           enable_vpid:bool
parm:           flexpriority_enabled:bool
parm:           enable_ept:bool
parm:           emulate_invalid_guest_state:bool

trying to boot the guest:
/usr/local/bin/qemu-system-x86_64 -cpu core2duo
	-hda ./ubuntu-server-8.10_64bit.root
	-cdrom /home/vm/iso/ubuntu/ubuntu-8.10-server-i386.iso
	-k it -usbdevice tablet -boot d

as soon as I run this command, in syslog appear:
cpu0: unhandled wrmsr: 0xc0010117 data 0
(always the same address)

and in the guest window, the latest 3 lines:
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory

(screendump in attachment)

the same with -cpu: coreduo

no problem (but still appear "unhandled wrmsr" error) with
all the other cpu

questions:
1) with -cpu qemu64 I obtain in the guest:
cat /proc/cpuinfo
vendor_id: GenuineIntel
but it doesn't seem a 64 bit cpu (?)

2) can I do some deeper debug to provide more useful info?
(or suggest me a different command-line)

3) what does "logfile" command (should) do?
CTRL-ALT-2
logfile /tmp/logfile
but there is no /tmp/logfile on host

thank you.

-- 
/* Paolo Pedaletti,
 * paolo@pedaletti.it www.pedaletti.it */

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Re: kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

[Amit Shah]

On Sun, Jan 11, 2009 at 04:16:03AM +0100, Paolo Pedaletti wrote:
> ciao,
> I have a problem to run a 64 bit intel guest inside a 64 bit intel host.
> It doesn' boot.

Looks like the core2duo CPU type has the problem.

> trying to boot the guest:
> /usr/local/bin/qemu-system-x86_64 -cpu core2duo
> 	-hda ./ubuntu-server-8.10_64bit.root
> 	-cdrom /home/vm/iso/ubuntu/ubuntu-8.10-server-i386.iso
> 	-k it -usbdevice tablet -boot d
> 
> as soon as I run this command, in syslog appear:
> cpu0: unhandled wrmsr: 0xc0010117 data 0
> (always the same address)

This is harmless and has been fixed for the upcoming release.

> the same with -cpu: coreduo

This is a 32-bit CPU type. A 64-bit kernel won't boot on this.

> questions:
> 1) with -cpu qemu64 I obtain in the guest:
> cat /proc/cpuinfo
> vendor_id: GenuineIntel
> but it doesn't seem a 64 bit cpu (?)

Check for the 'lm' flag in cpuinfo output.

Have you used 'core2duo' in a previous version without problems?

I could reproduce this with 32-bit and 64-bit guests. It works fine with
-no-kvm. I looked at this briefly; it's a problem in cpuid function 4
which has the Intel cache identification bits. We need updated info there.

Just for the refernce, kvm_stat shows this and CPU usage goes beyond 95%:

$ ./kvm_stat -1
efer_reload                   27         0
exits                    2652516    591716
fpu_reload                276172         0
halt_exits                    55         0
halt_wakeup                    0         0
host_state_reload         306818       143
hypercalls                     0         0
insn_emulation            579255         0
insn_emulation_fail            0         0
invlpg                         5         0
io_exits                  313047      1000
irq_exits                   4616       918
irq_injections               878       250
irq_window                    80         0
kvm_request_irq                0         0
largepages                     0         0
mmio_exits                  9140         0
mmu_cache_miss               281         0
mmu_flooded                  170         0
mmu_pde_zapped               373         0
mmu_pte_updated                3         0
mmu_pte_write               5531         0
mmu_recycled                   0         0
mmu_shadow_zapped            302         0
mmu_unsync                     1         0
mmu_unsync_global              1         0
nmi_injections                 0         0
nmi_window                     0         0
pf_fixed                    8615         0
pf_guest                       0         0
remote_tlb_flush               0         0
request_nmi                    0         0
signal_exits                   1         0
tlb_flush                 333740         0

Re: kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

[paolo pedaletti]

Ciao Amit,

>> 1) with -cpu qemu64 I obtain in the guest:
>> cat /proc/cpuinfo
>> vendor_id: GenuineIntel
>> but it doesn't seem a 64 bit cpu (?)
> 
> Check for the 'lm' flag in cpuinfo output.

with -cpu qemu64:

cat /proc/cpuinfo | grep flags
flags : fpu de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse6
clflush mmx fxsr sse sse2 syscall nx lm up pni

http://www.linuxquestions.org/questions/linux-general-1/proccpuinfo-flag-lm-358563/?s=58094402abd82d488b3daf02e520f6bf

ok, it's 64 bit

> Have you used 'core2duo' in a previous version without problems?

no, it's the first time, the hardware is new

> I could reproduce this with 32-bit and 64-bit guests. It works fine with
> -no-kvm. I looked at this briefly; it's a problem in cpuid function 4
> which has the Intel cache identification bits. We need updated info there.

can I provide you this information?
How?

> Just for the refernce, kvm_stat shows this and CPU usage goes beyond 95%:
> 
> $ ./kvm_stat -1
> efer_reload                   27         0
> exits                    2652516    591716
> fpu_reload                276172         0
> halt_exits                    55         0

the meaning of the two columns is .... ?

thank you.

-- 
Paolo Pedaletti

Re: kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

[Amit Shah]

On (Fri) Jan 16 2009 [15:49:04], paolo pedaletti wrote:
> Ciao Amit,
> 
> >> 1) with -cpu qemu64 I obtain in the guest:
> >> cat /proc/cpuinfo
> >> vendor_id: GenuineIntel
> >> but it doesn't seem a 64 bit cpu (?)
> > 
> > Check for the 'lm' flag in cpuinfo output.
> 
> ok, it's 64 bit
> 
> > Have you used 'core2duo' in a previous version without problems?
> 
> no, it's the first time, the hardware is new

I've sent out fixes for this; the next kvm release will let you use the
core2duo cpu type.

Amit

Re: kvm-82 doesn't boot 64bit (?) [cpu0 unhandled wrmsr]

[paolo pedaletti]

Ciao Amit Shah,

> I've sent out fixes for this; the next kvm release will let you use the
> core2duo cpu type.

perfect
thank you.

-- 
Paolo Pedaletti