From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: [PATCH] KVM: Enable "fast string operations" in MSR_IA32_MISC_ENABLE Date: Fri, 23 Sep 2011 11:56:50 -0300 Message-ID: <20110923145650.GB1618@amt.cnet> References: <1316692982-11539-1-git-send-email-avi@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from mx1.redhat.com ([209.132.183.28]:1025 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752865Ab1IWPDp (ORCPT ); Fri, 23 Sep 2011 11:03:45 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p8NF3iSN029371 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 23 Sep 2011 11:03:44 -0400 Content-Disposition: inline In-Reply-To: <1316692982-11539-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Thu, Sep 22, 2011 at 03:03:02PM +0300, Avi Kivity wrote: > Recent (3.0+) Linux guests check for the fast string bit in > MSR_IA32_MISC_ENABLE before enabling rep/movs based memcpy and > related on fam 6/model 13+ processors. > > Enable the bit by default, as required by the specification. > > Signed-off-by: Avi Kivity Belongs to userspace.