From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH] kvm-12 userland guest reboot fix Date: Wed, 24 Jan 2007 17:14:34 +0200 Message-ID: <45B777DA.8050209@qumranet.com> References: <20070124130534.GA19732@amd.com> <45B7638E.300@qumranet.com> <20070124143902.GB19730@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Joerg Roedel Return-path: In-Reply-To: <20070124143902.GB19730-5C7GfCeVMHo@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Joerg Roedel wrote: > On Wed, Jan 24, 2007 at 03:47:58PM +0200, Avi Kivity wrote: > >> Joerg Roedel wrote: >> >>> From: Markus Rechberger >>> From: Joerg Roedel >>> >>> This patch fixes the initialization of the segment registers which >>> solves the triple fault and keyboard controller reset problems in >>> kvm/qemu guests as well as the slow grub menu interaction. This works >>> for SVM now, it is not tested on kvm/vmx. >>> >>> >>> >> The patch fails to boot on Intel hosts. Most likely the segment >> changes are illegal for vm86 mode, which we use on Intel to simulate >> real mode. >> >> I tried to change flags in cpu_reset() so that type == 3 and dpl == 3, >> as required by 22.3.1.2, but it didn't help. >> > > Hmm, I am not aware of the VMX and realmode emulation implementation. Is > it hard to simply hide those flags to the vm86 mode? > > It is supposed to be hidden (see fix_rmode_seg(), called from enter_rmode()), but somehow that path fails. It's been a while since I hacked on that code. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV