From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jun'ichi Nomura" Subject: regression in v3.9? a guest stuck in BIOS if emulate_invalid_guest_state=Y Date: Tue, 07 May 2013 18:55:23 +0900 Message-ID: <5188CF8B.8040809@ce.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from TYO200.gate.nec.co.jp ([210.143.35.50]:45587 "EHLO tyo200.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751021Ab3EGKC7 (ORCPT ); Tue, 7 May 2013 06:02:59 -0400 Received: from tyo202.gate.nec.co.jp ([10.7.69.202]) by tyo200.gate.nec.co.jp (8.13.8/8.13.4) with ESMTP id r47A2w6T013887 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 7 May 2013 19:02:58 +0900 (JST) Received: from mailgate3.nec.co.jp ([10.7.69.193]) by tyo202.gate.nec.co.jp (8.13.8/8.13.4) with ESMTP id r479uuxs022568 for ; Tue, 7 May 2013 18:56:56 +0900 (JST) Received: (from root@localhost) by mailgate3.nec.co.jp (8.11.7/3.7W-MAILGATE-NEC) id r479uut21770 for kvm@vger.kernel.org; Tue, 7 May 2013 18:56:56 +0900 (JST) Received: from mail03.kamome.nec.co.jp (mail03.kamome.nec.co.jp [10.25.43.7]) by mailsv3.nec.co.jp (8.13.8/8.13.4) with ESMTP id r479ueGa001311 for ; Tue, 7 May 2013 18:56:55 +0900 (JST) Sender: kvm-owner@vger.kernel.org List-ID: 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? # 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: # 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