Mark Williamson said this regarding the grant_table api (and the fact that it is not working yet):>Right now, domains which need to map other domains >memory are privileged and can map what they likeIs anybody doing this? If so, what kernel mechanisms are you using? (I''m sure this question is very easy to answer for a kernel hacker) ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Mark A. Williamson
2005-Feb-02 15:53 UTC
Re: [Xen-devel] mapping guest domain memory to Dom0
> >Right now, domains which need to map other domains > >memory are privileged and can map what they like > > Is anybody doing this? If so, what kernel mechanisms are you using? > (I''m sure this question is very easy to answer for a kernel hacker)Yes, shared memory is an important part of Xen''s architecture. The userspace xc library and the xcs control switch map another domain''s memory to put the kernel image, etc into it. The code for this is in tools/libxc/xc_private.c The blkback.c, netback.c (and usbback.c if you are on unstable) drivers under drivers/xen/{blk,net,usb}back/ show how to map another domain''s memory from kernel space (it''s a bit less user friendly than the userspace interface). HTH, Mark ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
I am using the xc_map_foreign_range() function to attempt to map memory from a guest domain into Domain 0. I am guessing that the value named mfn indicates the page in the guest domain that I wish to start mapping from. If this assumption is correct, how do I get a value for mfn? Say for instance, that I wanted to map the kernel running in the guest domain? How about a specific process? -Adam Thorsen On Wed, 2 Feb 2005 15:53:54 +0000, Mark A. Williamson <mark.williamson@cl.cam.ac.uk> wrote:> > >Right now, domains which need to map other domains > > >memory are privileged and can map what they like > > > > Is anybody doing this? If so, what kernel mechanisms are you using? > > (I''m sure this question is very easy to answer for a kernel hacker) > > Yes, shared memory is an important part of Xen''s architecture. > > The userspace xc library and the xcs control switch map another domain''s > memory to put the kernel image, etc into it. The code for this is in > tools/libxc/xc_private.c > > The blkback.c, netback.c (and usbback.c if you are on unstable) drivers under > drivers/xen/{blk,net,usb}back/ show how to map another domain''s memory from > kernel space (it''s a bit less user friendly than the userspace interface). > > HTH, > Mark >------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel