From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: [RFC PATCH 0/5] x86: workaround inability to fully restore FPU state Date: Thu, 18 Feb 2016 18:52:05 +0000 Message-ID: <1455821530-4263-1-git-send-email-david.vrabel@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aWTgd-0002UH-4O for xen-devel@lists.xenproject.org; Thu, 18 Feb 2016 18:52:23 +0000 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xenproject.org Cc: Andrew Cooper , David Vrabel , Jan Beulich List-Id: xen-devel@lists.xenproject.org This series extends the workaround for the inability for some x86 CPUs to fully restore the FPU exception state (64-bit FIP/FDP and FCS/FDS). 32-bit save/restore is always done for Windows guests and the toolstack may override the default behaviour. The first 2 patches add a domctl to get/set numeric parameters. I was surprised there wasn't an existing mechanism for this. This series is RFC since I haven't tested it very much. David