[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Guest OS without paging
On Mon, Nov 07, 2005 at 05:26:19PM +0000, Mark Williamson wrote: > I guess I'm not clear what memory model you need for Minix, can you clarify? > What version of Minix is this? Does it really not do any virtual memory of > its own? Does it do any tricks at all (demand paging? page sharing?), or > does it run unpaged or something else? well, minix uses segmentation but doesn't use paging at all, because it's build to be portable and not all processers have a mmu unit(i think the arm doesn't and such). Im using minix 3. > > Domains get a hard allocation of real memory, so when the pages get populated > is entirely up to the guest; Xen won't interfere. What about page faults? Will I have to have to write code to handle these, or can I assume that since im only ever using memory thats alreayd mapped, page faults wont occur? > > If you essentially want to pretend you've got a flat, unpaged address space > then you should be able to just be able to build a set of page tables (for > instance in your custom builder) and then pretend they're not there. Just > remember that you can't use the very top part of the address space because > Xen will be mapped there. Thats exactly what I want. Does the 64M address space need to have entries in my page table or can i just make my guest's pagetable from 64M-xxM. Also, is there are any pages allocated in this 64M address space, will they my allocated from the domains pool of page frames, or from dom0's? Best regards Ivan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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