Author: kib Date: Sun Jun 5 17:11:23 2016 New Revision: 301457 URL: https://svnweb.freebsd.org/changeset/base/301457
Log: Avoid spurious EINVAL in amd64 pmap_change_attr(). Do not try to change attributes for DMAP when working on a mapping which is not covered by the DMAP. This was reported on real system where a BAR of a device (NTB) was mapped outside the PCI window. Reported and tested by: mav Reviewed by: jhb, mav Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D6668 Modified: head/sys/amd64/amd64/pmap.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Sun Jun 5 17:04:03 2016 (r301456) +++ head/sys/amd64/amd64/pmap.c Sun Jun 5 17:11:23 2016 (r301457) @@ -6533,7 +6533,7 @@ static int pmap_change_attr_locked(vm_offset_t va, vm_size_t size, int mode) { vm_offset_t base, offset, tmpva; - vm_paddr_t pa_start, pa_end; + vm_paddr_t pa_start, pa_end, pa_end1; pdp_entry_t *pdpe; pd_entry_t *pde; pt_entry_t *pte; @@ -6716,9 +6716,12 @@ pmap_change_attr_locked(vm_offset_t va, tmpva += PAGE_SIZE; } } - if (error == 0 && pa_start != pa_end) - error = pmap_change_attr_locked(PHYS_TO_DMAP(pa_start), - pa_end - pa_start, mode); + if (error == 0 && pa_start != pa_end && pa_start < dmaplimit) { + pa_end1 = MIN(pa_end, dmaplimit); + if (pa_start != pa_end1) + error = pmap_change_attr_locked(PHYS_TO_DMAP(pa_start), + pa_end1 - pa_start, mode); + } /* * Flush CPU caches if required to make sure any data isn't cached that _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
