Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964900AbWCWARA (ORCPT ); Wed, 22 Mar 2006 19:17:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964898AbWCWAQ7 (ORCPT ); Wed, 22 Mar 2006 19:16:59 -0500 Received: from mailout1.vmware.com ([65.113.40.130]:40204 "EHLO mailout1.vmware.com") by vger.kernel.org with ESMTP id S964900AbWCWAQ6 (ORCPT ); Wed, 22 Mar 2006 19:16:58 -0500 Message-ID: <4421E8F6.10507@vmware.com> Date: Wed, 22 Mar 2006 16:16:54 -0800 From: Zachary Amsden User-Agent: Thunderbird 1.5 (X11/20051201) MIME-Version: 1.0 To: Chris Wright Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, virtualization@lists.osdl.org, Ian Pratt , Christian Limpach Subject: Re: [RFC PATCH 17/35] Segment register changes for Xen References: <20060322063040.960068000@sorel.sous-sol.org> <20060322063752.889921000@sorel.sous-sol.org> In-Reply-To: <20060322063752.889921000@sorel.sous-sol.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 682 Lines: 14 Chris Wright wrote: > 1. We clear FS/GS before changing TLS entries and switching LDT, as > otherwise the hypervisor will fail to restore thread-local values on > return to the guest kernel and we take a slow exception path. > This should not be needed. You should clear FS/GS that match updated descriptors in your descriptor validation code instead. And you will get better performance for both native and the hypervisor cases. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/