[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 3/4] xen: arm: rearrange guest physical address space to increase max RAM
On Tue, 2014-04-08 at 17:01 +0100, Julien Grall wrote: > >> Also, can you make sure that the GNTTAB_SIZE is greater or equal to the > >> maximum number of frames (maybe by overriding max_nr_grant_frames)? > > > > It turns out that the current size corresponds to > > DEFAULT_MAX_NR_GRANT_FRAMES, which explains where it came from. > > I know it... a comment in the code here would be great to avoid loosing > 20mins every time we hit this define. Feel free to send a patch. > > If you want to change this to reserve say 1MB of address space (which is > > enough for 256 grant pages) or even more then please send a patch. > > > >> The current implementation on Linux only care about the number of frames > >> given by Xen, the size of the table in the DT is not used. So the range > >> may overlap to something else. > > > > That would be a guest bug, but nothing to do with this series. > > It's not really a guest bug ... we have an hypercall which provides the > GNTTAB size (see gnttab_query_size). > > It returns max_nr_grant_frames which can be modified by the Xen command > line. The tools could query this and use it to size the region, or we could just make the region be more than large enough. Patches welcome. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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