On Tue, 2015-01-06 at 18:57 +0000, David Vrabel wrote: > In an x86 PV guest, get_user_pages_fast() on a userspace address range > containing foreign mappings does not work correctly because the M2P > lookup of the MFN from a userspace PTE may return the wrong page. > > Force get_user_pages_fast() to fail on such addresses by marking the PTEs > as special. > > If Xen has XENFEAT_gnttab_map_avail_bits (available since at least > 4.0),
http://wiki.xenproject.org/wiki/Xen_Kernel_Feature_Matrix says the dom0 pvpops already requires >= 4.0 too, which matches my recollection (something to do with a new APIC interface which upstream insisted on during upstreaming, IIRC), but both could be out of date... Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
