diff options
| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2014-07-09 13:18:18 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-08-07 12:00:11 -0700 |
| commit | 9c98268072b611fab39eee633e3f2e7b2d8c64da (patch) | |
| tree | f900ca3c1ed953810c816b7ab69e502b1315bc63 /mm | |
| parent | cca69958eee770a0b618bc73fec41b32d2b50387 (diff) | |
x86/espfix/xen: Fix allocation of pages for paravirt page tables
commit 8762e5092828c4dc0f49da5a47a644c670df77f3 upstream.
init_espfix_ap() is currently off by one level when informing hypervisor
that allocated pages will be used for ministacks' page tables.
The most immediate effect of this on a PV guest is that if
'stack_page = __get_free_page()' returns a non-zeroed-out page the hypervisor
will refuse to use it for a page table (which it shouldn't be anyway). This will
result in warnings by both Xen and Linux.
More importantly, a subsequent write to that page (again, by a PV guest) is
likely to result in fatal page fault.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: http://lkml.kernel.org/r/1404926298-5565-1-git-send-email-boris.ostrovsky@oracle.com
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions