linux-kernel - Re: [visorchipset] invalid opcode: 0000 [#1] PREEMPT SMP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <C97001BC43954D438ACB059713BA5CDF92040F0F12@USEA-EXCH7.na.uis.unisys.com>
Date:	Fri, 11 Apr 2014 12:49:36 -0500
From:	"Romer, Benjamin M" <Benjamin.Romer@...sys.com>
To:	Jet Chen <jet.chen@...el.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [visorchipset] invalid opcode: 0000 [#1] PREEMPT SMP

On Sat, 2014-04-12 at 01:35 +0800, Jet Chen wrote:

> Hi Ben,
> 
> I re-tested this case with/without option -enable-kvm.
> 
> qemu-system-x86_64 -cpu Haswell,+smep,+smap			invalid op
> qemu-system-x86_64 -cpu kvm64					invalid op
> qemu-system-x86_64 -cpu Haswell,+smep,+smap -enable-kvm 	everything OK
> qemu-system-x86_64 -cpu kvm64 -enable-kvm			everything OK
> 
> I think this is probably a bug in QEMU.
> Sorry for misleading you. I am not experienced in QEMU usage. I don't realize I need try this case with different options Until read Peter's reply.
> 
> As Peter said, QEMU probably should *not* set the hypervisor bit. But based on my testing, I think KVM works properly in this case.
> 
> Thanks,
> Jet

Great, thanks! Sorry for the trouble. :)

-- Ben