From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44185) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZyGLU-0000X0-Pe for qemu-devel@nongnu.org; Mon, 16 Nov 2015 04:45:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZyGLR-0000Cx-Js for qemu-devel@nongnu.org; Mon, 16 Nov 2015 04:45:08 -0500 Received: from mx1.redhat.com ([209.132.183.28]:49906) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZyGLR-0000BK-FO for qemu-devel@nongnu.org; Mon, 16 Nov 2015 04:45:05 -0500 References: <1447441633-32526-1-git-send-email-ehabkost@redhat.com> From: Paolo Bonzini Message-ID: <5649A59B.1090209@redhat.com> Date: Mon, 16 Nov 2015 10:44:59 +0100 MIME-Version: 1.0 In-Reply-To: <1447441633-32526-1-git-send-email-ehabkost@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [QEMU PATCH] target-i386: Disable rdtscp on Opteron_G* CPU models List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eduardo Habkost , qemu-devel@nongnu.org Cc: libvir-list@redhat.com, Richard Henderson On 13/11/2015 20:07, Eduardo Habkost wrote: > KVM can't virtualize rdtscp on AMD CPUs yet, so there's no point > in enabling it by default on AMD CPU models, as all we are > getting are confused users because of the "host doesn't support > requested feature" warnings. > > Disable rdtscp on Opteron_G* models, but keep compatibility on > pc-*-2.4 and older (just in case there are people are doing funny > stuff using AMD CPU models on Intel hosts). > > Signed-off-by: Eduardo Habkost Can we do it only on KVM and not on TCG? Paolo