From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: regression in v3.9? a guest stuck in BIOS if
 emulate_invalid_guest_state=Y
Date: Tue, 7 May 2013 13:35:20 +0300
Message-ID: <20130507103520.GL12349@redhat.com>
References: <5188CF8B.8040809@ce.jp.nec.com>
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To: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
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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?

> # 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
> --
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--
			Gleb.