On Wed, Jan 23, 2008 at 03:35:54PM +0100, Gerd Hoffmann wrote: > Robin Holt wrote: > > We have a seg structure which is similar to some structure you probably > > have which describes the grant. One of the things hanging off that > > seg structure is essentially a page table containing PFNs with their > > respective flags (XPMEM specific and not the same as the pfn flags in > > the processor page tables). > > i.e. page tables used by hardware != cpu, right?
Actually page tables used exclusively by software during the cross partition coordination. Those entries are inserted on the remote side by normal faults with VM_PFNMAP vmas created by the importing side. > In the Xen guest case the normal processor page tables are modified, but > in a special way to make the Xen hypervisor also release the grant. In our guest case, we can not access the kernel struct page area on the remote host. We therefore handle all the ref/deref of the page as part of messaging the PFN across the partition boundaries. Thanks, Robin ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
