From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@qumranet.com>
Subject: Re: [Bug] Real mode guests never wake up after an HLT instruction
Date: Sun, 22 Jun 2008 10:15:12 +0300
Message-ID: <485DFC00.5070008@qumranet.com>
References: <52d4a3890806171502t2f6db2bdi3eef4aed354b2a81@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: kvm@vger.kernel.org
To: Mohammed Gamal <m.gamal005@gmail.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from il.qumranet.com ([212.179.150.194]:33587 "EHLO il.qumranet.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750948AbYFVHO7 (ORCPT <rfc822;kvm@vger.kernel.org>);
	Sun, 22 Jun 2008 03:14:59 -0400
In-Reply-To: <52d4a3890806171502t2f6db2bdi3eef4aed354b2a81@mail.gmail.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

Mohammed Gamal wrote:
> CPU Model:  Intel(R) Core(TM)2 Duo CPU T7250  @ 2.00GHz
> KVM version: kvm-69-1687-gd660add
> Host Kernel: 2.6.26-rc5 (x86_64)
> Guests: FreeDOS and Minix 3.1.2 32-bit
> Command: qemu-system-x86_64 -hda /media/sda6/<dos or minix image>
>
> Real mode guests (namely Minix 3 and FreeDOS with HIMEM XMS driver)
> freeze after issuing an hlt instruction and never wake up. The problem
> occurs both with and without commit 36742c5470. Problem disappears
> using -no-kvm switch.
>   

Can you check if halt_request is being set properly?

Looking at the code, all seems fine.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.