From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [PATCH 4/5] KVM: Lazify fpu activation and deactivation Date: Wed, 6 Jan 2010 11:47:45 +0100 Message-ID: <20100106104744.GJ14679@amd.com> References: <1262190342-18611-1-git-send-email-avi@redhat.com> <1262190342-18611-5-git-send-email-avi@redhat.com> <20100106002529.GA11233@amt.cnet> <4B4400F5.2010309@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Marcelo Tosatti , Sheng Yang , kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from tx2ehsobe002.messaging.microsoft.com ([65.55.88.12]:46773 "EHLO TX2EHSOBE003.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755641Ab0AFKsZ (ORCPT ); Wed, 6 Jan 2010 05:48:25 -0500 Content-Disposition: inline In-Reply-To: <4B4400F5.2010309@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, Jan 06, 2010 at 05:18:13AM +0200, Avi Kivity wrote: > Joerg, what was the reason the initial npt implementation did not do > lazy fpu switching? The lazy fpu switching code needed cr3 accesses to be intercepted. With NPT this was the only reason left to intercept cr3 so I decided to switch lazy fpu switching off and don't intercept cr3 accesses. Joerg