[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 3/4 RFC] x86/p2m: use large pages for MMIO mappings
>>> On 29.09.15 at 13:33, <julien.grall@xxxxxxxxxx> wrote: > On 15/09/15 08:34, Jan Beulich wrote: >> RFC reasons: >> - ARM side unimplemented (and hence libxc for now made cope with both >> models), the main issue (besides my inability to test any change >> there) being the many internal uses of map_mmio_regions()) > > map_mmio_regions is used in ARM to map all the device memory in a guest. > We expect this function to map everything at once when called during > DOM0 build and/or when a guest is created (used to map the interrupt > controller). > > I would rather prefer to avoid introducing specific helpers with > slightly different behavior (i.e one is only mapping N page, the other > everything). > > What about extending map_mmio_regions to take a parameter telling if we > want to limit the number of mapping in a single invocation? Sure an option, albeit something that would be sufficient to be done in ARM specific code, albeit the only user using variable length is map_range_to_domain(). All the others, using fixed lengths up to 32 pages, would implicitly get everything done at once as long as the threshold is >= 32. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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