From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Subject: Re: [PATCH 1/1] Disable GUEST_INTR_STATE_STI flag before injecting
 NMI to guest on VMX
Date: Fri, 27 Aug 2010 10:31:06 +0200
Message-ID: <4C7777CA.4010208@redhat.com>
References: <1282853162-16925-1-git-send-email-Jes.Sorensen@redhat.com> <1282853162-16925-2-git-send-email-Jes.Sorensen@redhat.com> <4C7776F9.4070306@siemens.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
Cc: kvm@vger.kernel.org, avi@redhat.com, gleb@redhat.com
To: Jan Kiszka <jan.kiszka@siemens.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:40290 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752463Ab0H0IbK (ORCPT <rfc822;kvm@vger.kernel.org>);
	Fri, 27 Aug 2010 04:31:10 -0400
In-Reply-To: <4C7776F9.4070306@siemens.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On 08/27/10 10:27, Jan Kiszka wrote:
> Am 26.08.2010 22:06, Jes.Sorensen@redhat.com wrote:
>> From: Jes Sorensen <Jes.Sorensen@redhat.com>
>>
>> Injecting an NMI while GUEST_INTR_STATE_STI is set may fail,
>> which can cause an EXIT with invalid state, resulting in the
>> guest dieing.
> 
> Very interesting. Reality obviously doesn't bother about the statement
> of the vendor [1].
> 
> Just curious: is this limited to specific CPU models or actually a
> generic issue?

I have been able to reproduce this on a core2 and a nehalem box, so I
think it is at least somewhat generic on Intel. Not sure if it can be
reproduced on AMD.

It also seems to be specific to which guest kernel I run, so timing may
play a part as well.

Cheers,
Jes