On 05/12/16 16:34, Juergen Gross wrote: > Today's interface to get the machine memory map in dom0 requires to > know in advance how large the final map will be. There is however no > way to either get only a part of the memory map or to ask the > hypervisor about its size. > > This patch set enhances the XENMEM_machine_memory_map hypercall to > solve both issues by returning only a partial memory map in case the > supplied buffer was too small and to return the needed number of > entries if no buffer is being supplied.
These changes appear to be a good improvement in behaviour. However, there is a way to know the exact size of the memory map. Use XENMEM_maximum_ram_page to find the maximum mfn, and use that to calculate the size of the mapping. See tools/libxc/xc_sr_common_x86_pv.c: x86_pv_map_m2p() (Not that I think this interface is very nice either...) ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
