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

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Date:	Tue, 8 Apr 2014 10:53:29 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Romer, Benjamin M" <Benjamin.Romer@...sys.com>
Cc:	*S-Par-Maintainer <SParMaintainer@...sys.com>,
	Ken Cox <jkc@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Jet Chen <jet.chen@...el.com>
Subject: Re: [visorchipset] invalid opcode: 0000 [#1] PREEMPT SMP

Hi Benjamin,

> Fengguang,
> 
> I ran your script against freshly-checked-out source from staging-next, and was not able to reproduce the error with it. My boot log is attached. I noticed that your log did not have "Hypervisor detected: KVM" in the trace. The KVM options in your script also differ substantially from the ones shown at the end of your trace...
 
> When I reran your script with the "-cpu Haswell,+smep,+smap" option I was able to get the same result as you. IMHO KVM should not be setting this bit if it's emulating bare metal.

Sorry.. We tried to provide a simplified reproduce script and in your
case, it has a significant mismatch with the real KVM options. We'll
fix it, thanks for pointing it out!

Thanks,
Fengguang
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