Re: KVM entry failed, hardware error

[Johannes Bauer <dfnsonfsduifb@gmx.de>]

On 03.06.2012 14:33, Avi Kivity wrote:

>> when trying to install Windows7 in a qemu-kvm 1.0.1 installation on
>> Gentoo on my host running
> 
> Is that a 32-bit or 64-bit Windows 7?

64 bit. But I've also (in despair) tried installing 32 Bit Windows 7,
with the exact same effect.

>> EAX=00000010 EBX=00000080 ECX=00000000 EDX=00000080
>> ESI=0025da4a EDI=0007da4a EBP=00001f20 ESP=00000200
>> EIP=0000009b EFL=00000002 [-------] CPL=3 II=0 A20=1 SMM=0 HLT=0
>> ES =0020 00000200 0000ffff 00009300
>> CS =b000 002b0000 0000ffff 0000f300
> 
> Pre-unrestricted mode hosts require cs.selector (first number) * 16 ==
> cs.base (second number).  This clearly isn't the case here.

I've checked with vmxcap and my PC indeed does not support unrestricted
mode. My Laptop (on which the identical image works perfectly) does.

> # rmmod kvm_intel
> # modprobe kvm_intel emulate_invalid_guest_state=1
> 
> Warning: experimental code.

Tried it out -- I don't get the error anymore, but qemu just hangs on
boot with 100% CPU. :-(

>> Or is
>> it impossible to run Windows 7 with kvm on a Core Quad (which possibly
>> doesn't support "Unrestricted Guest")?
> 
> It should be possible.  Did you do anything special with the guest
> (install any software?) before rebooting?  Is this repeatable?

Nothing at all, just a standard installation. Did not even get to the
point where I *could* install software (it reboots during the
installation and that's where it doesn't come up anymore).

I even tried to completing the installation on my laptop (which works),
then copy the image back on my desktop PC: Same error.

Any hints on how I could debug the hang with the emulation of invalid
guest state? Or is there a more recent version (git?) than a 3.3.7
kernel that I should try out?

Thanks for your help,
Best regards,
Joe