Abhinav Srivastava
2009-Nov-04 21:43 UTC
[Xen-devel] How to allocate a page inside the guest OS from Xen
Hi there, In my project, I have to allocate a memory page inside the guest OS from the Xen hypervisor. The alloc_domheap_page(d) function allocates a single page from the dom heap, which looks okey for my purpose. But, I do not know how to add the allocated page into the guest page table, so that guest can access this page. I do not want to allocate a Xen page and share it with the guest. My question is: how do I make my guest OS aware of this page without doing anything inside the guest OS. Is there any function in Xen that directly adds a page into the guest OS address space or I have to walk on the guest page tables and add this page manually. Any help would be appreciated? Thanks, Abhinav Keep up with people you care about with Yahoo! India Mail. Learn how. http://in.overview.mail.yahoo.com/connectmore _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
James (song wei)
2009-Nov-05 02:14 UTC
Re: [Xen-devel] How to allocate a page inside the guest OS from Xen
I am not clear why did you want to let VM aware it. Gerenally speaking, mfn -> gfn in p2m table. If the Guest OS can acess the pfn without "Page Fault" , perhaps could satisfy you. Hope this is helpful. -James (song wei) Abhinav Srivastava-2 wrote:> > Hi there, > > In my project, I have to allocate a memory page inside the guest OS from > the Xen hypervisor. The alloc_domheap_page(d) function allocates a single > page from the dom heap, which looks okey for my purpose. But, I do not > know how to add the allocated page into the guest page table, so that > guest can access this page. I do not want to allocate a Xen page and share > it with the guest. > > My question is: how do I make my guest OS aware of this page without doing > anything inside the guest OS. Is there any function in Xen that directly > adds a page into the guest OS address space or I have to walk on the guest > page tables and add this page manually. > > Any help would be appreciated? > > Thanks, > Abhinav > > > > Keep up with people you care about with Yahoo! India Mail. Learn > how. http://in.overview.mail.yahoo.com/connectmore > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel > >-- View this message in context: http://old.nabble.com/How-to-allocate-a-page-inside-the-guest-OS-from-Xen-tp26205166p26208147.html Sent from the Xen - Dev mailing list archive at Nabble.com. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel