From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: MTRR and cache programming in Xen Date: Tue, 13 Jan 2015 10:36:45 +0000 Message-ID: <1421145405.19103.0.camel@citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta14.messagelabs.com ([193.109.254.103]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1YAyqB-0003do-Ik for xen-devel@lists.xenproject.org; Tue, 13 Jan 2015 10:36:51 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: ayush ruia Cc: xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org On Mon, 2015-01-12 at 19:59 -0600, ayush ruia wrote: > Hi all, > Hoping that you could answer a few of my queries regarding cache > properties for Xen. > > Is there any support from Xen for supporting MTRRs or any similar > caching mechanisms such as PAT? How does Xen handle I/O ranges because > different memory regions may have different caching requirements and > any domU can be allocated I/O regions? Is the control on x86 only on > individual page basis? How does that reflect in terms of Intel VT-x > and Intel VT-d extensions and VMCS structures? > > > Any pointers regarding the above will be very helpful and highly > appreciated. grep'ping for some of those keywords in the Xen source code and search for "Xen $keyword" on a search engine should give you a reasonable starting point. See also http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions Ian.