[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH 0/2] map grant refs at pfn = mfn
>>> On 08.07.14 at 17:52, <stefano.stabellini@xxxxxxxxxxxxx> wrote: > One reason for wanting the second p2m mapping is to avoid tracking mfn > to pfn mappings in the guest kernel. Since the same mfn can be granted > multiple times to the backend, finding the right pfn corresponding to a > given mfn can be difficult and expensive. Providing a second mapping at > a known address allow the kernel to access the page without knowing the > pfn. Isn't this just extending the 1:1 mapping hack, further special casing handling on ARM rather than trying to use architecture independent code in generic operations like grant (un)mapping as much as possible? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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