From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rusty Russell Subject: Re: [RFC 0/8]KVM: swap out guest pages Date: Tue, 24 Jul 2007 09:10:18 +1000 Message-ID: <1185232218.1803.36.camel@localhost.localdomain> References: <1185173489.2645.64.camel@sli10-conroe.sh.intel.com> <46A4829C.9080104@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , lkml To: Avi Kivity Return-path: In-Reply-To: <46A4829C.9080104-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On Mon, 2007-07-23 at 13:27 +0300, Avi Kivity wrote: > Having an address_space (like your patch does) is remarkably simple, and > requires few hooks from the current vm. However using existing vmas > mapped by the user has many advantages: > > - compatible with s390 requirements > - allows the user to use hugetlbfs pages, which have a performance > advantage using ept/npt (but which are unswappable) > - allows the user to map a file (which can be regarded as way to specify > the swap device) > - better ingration with the rest of the vm You don't need to expose the vmas. You just have userspace point out the start+len of each region of memory it wants the guest to be able to access, and the address it wants it to appear in the guest. This is a slight superset of what lguest does in two ways: 1) my guest address == user address, but I'm looking at adding an offset so I don't have to link the launcher binary specially. 2) I have only one contiguous region of guest-physical memory, since I can place device memory immediately above "normal" mem. But the result is pretty sweet, and doesn't require any new symbols to be exported. Cheers, Rusty. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/