On Sat, Aug 6, 2011 at 11:35 PM, Thayumanavar S <[email protected]> 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. > > you can covert pa to pfn to struct page (there are some macros in the > kernel that does this, you grep the kernel source for it) and directly > set the PG_reserved flag of that struct page. > > Ok. But in this case i have to ensure that the pfn is not mapped by the kernel, right? Will scanning mem_map to find such a pfn help? I'm wondering if there are regions which are typically 'free' which i can reserve and use. Thanks for the reply,
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