Re: regression in v3.9? a guest stuck in BIOS if emulate_invalid_guest_state=Y

["Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>]

On 05/07/13 19:35, Gleb Natapov wrote:
> On Tue, May 07, 2013 at 06:55:23PM +0900, Jun'ichi Nomura wrote:
>> Hello,
>>
>> With v3.9 kernel and Nehalem CPU (i.e. unrestricted_guest=N),
>> a guest stuck during boot (seemingly in BIOS).
>> When setting emulate_invalid_guest_state=0, it does boot.
>> (With v3.8 kernel and older, the guest used to boot fine by default.)
>>
>> The userspace is qemu-kvm of RHEL6.
>> It seems the guest boots up fine with upstream qemu 1.4.1.
>>
>> Is this a kernel bug? Or is the userspace just too old to run on v3.9?
>>
>>
> It should work. What seabios version are you using?

It's seabios-0.6.1.2-26.el6.
(and qemu-kvm-0.12.1.2-2.355.el6)

> 
>> # virsh start vm12; virsh console vm12
>> Domain vm12 started
>>
>> Connected to domain vm12
>> Escape character is ^]
>>
>> Google, Inc.
>> Serial Graphics Adapter 07/26/11
>> SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@hs20-bc2-3.build.redhat.com) Tue Jul 26 15:05:08 UTC 2011
>> Term: 
>> <Ctrl-]>
>>
>> # virsh qemu-monitor-command vm12 --hmp info registers
>> EAX=f000e850 EBX=0000ffff ECX=00000000 EDX=0000ffff
>> ESI=00000104 EDI=00000060 EBP=00000000 ESP=00006eb0
>> EIP=000006ca EFL=00000046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
>> ES =0040 00000400 ffffffff 00809300
>> CS =c000 000c0000 ffffffff 00809b00
>> SS =0000 00000000 ffffffff 00809300
>> DS =0040 00000400 ffffffff 00809300
>> FS =0000 00000000 ffffffff 00809300
>> GS =0000 00000000 ffffffff 00809300
>> LDT=0000 00000000 0000ffff 00008200
>> TR =0000 00000000 0000ffff 00008b00
>> GDT=     000fc558 00000037
>> IDT=     00000000 000003ff
>> CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
>> DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
>> DR6=ffff0ff0 DR7=00000400
>> FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
>> FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
>> FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
>> FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
>> FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
>> XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
>> XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
>> XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
>> XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
>>
>> # cat /sys/module/kvm_intel/parameters/emulate_invalid_guest_state 
>> Y
>> # cat /sys/module/kvm_intel/parameters/unrestricted_guest
>> N

-- 
Jun'ichi Nomura, NEC Corporation