On Sat, Aug 6, 2011 at 11:36 AM, Prateek Sharma <prateek3.14@xxxxxxxxx> wrote: > Hello everyone, > I am wondering whether it is possible to reserve a particular physical > page in the kernel. > The GFP pages can start from _any_ location, and i cannot find a way to > specify a starting pfn. > I need a few dozen pages to store a bitmap starting at a particular physical > page frame number. > Perhaps i am trying to do this wrong? I am trying to establish a > (one-way) communication between KVM and a guest VM, by assuming that if KVM > knows the physical address in the VM , it can access that bitmap. > > Thanks ! > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > Hi Prateek! I'm not completely sure, but why don't you hide needed page from kernel? I mean, you can provide kernel with memory layout configuration through mem= boot option. You can, for instance, use mem=32768K@0K,mem=32764K@32772K, i.e. you tell to kernel there is a gap (starting at 32768K from 0x0 in 4K size) in memory layout. Later, you can use this gap via ioremap call. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
