qemu not able to run 64 bit OS when -enable-kvm is used with a 64 bit processor

[bhasker]

Hi,

 The host processor is a 64 bit processor (as below)

  When I run the emulated mode of 64 bit (full emulation) I can run the 64 bit OS fine. when I start using -enable-kvm, I get error message that

"Your CPU does not support long mode. Use a 32bit distribution."

trying to install SuSe linux enterprise server 64 bit

Information ------------------------------------------------------------------------------------------------------------------------------
------------------------------------------
processor cat /proc/cpuinfo

processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Quad CPU @ 2.66GHz
stepping : 7
cpu MHz : 2671.246
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 3
initial apicid : 3
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
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 lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow
bogomips : 5342.46
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

------------------------------------------
command line used

qemu-system-x86_64 -enable-kvm -cdrom /img/cd.iso

why is kvm not able to use 64 bit capability in a host which is a 64 bit processor ?

[Anthony Liguori (anthony-codemonkey)]

Because you're using a 32-bit OS in the host.

[bhasker (bhasker-unixindia)]

I tried this
                                                                                                                                                    kernel uname: 2.6.32-5-amd64 #1 SMP Sat Jul 24 01:47:24 UTC 2010 x86_64
with version 0.12.5

when tried to use -enable-kvm the system starts out in the 32 bit mode rather than 64 bit. kvm version:
------------------
filename: /lib/modules/2.6.32-5-amd64/kernel/arch/x86/kvm/kvm-intel.ko
license: GPL
author: Qumranet depends: kvm
vermagic: 2.6.32-5-amd64 SMP mod_unload modversions
parm: bypass_guest_pf:bool
parm: vpid:bool
parm: flexpriority:bool
parm: ept:bool
parm: unrestricted_guest:bool
parm: emulate_invalid_guest_state:bool

this problem is still present.

Even if I use qemu-system-x86_64 I am able to run the 64 bit OS only if -enable-kvm is avoided but
the system is very slow.

[Anthony Liguori (anthony-codemonkey)]

You're host kernel is 64-bit? Please show the full command line you use to launch qemu.

[agraf (agraf)]

What does
  file `which qemu-system-x86_64`
say?

[bhasker (bhasker-unixindia)]

oops
I made a mistake
there were old binaries left out.
It is working fine now.