On Sat, Aug 6, 2011 at 11:36 AM, Prateek Sharma <prateek3.14@gmail.com> 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 !
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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.