diff options
| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2014-07-09 13:18:18 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-07-14 13:47:32 -0700 |
| commit | 8762e5092828c4dc0f49da5a47a644c670df77f3 (patch) | |
| tree | a54805cac2758322f4e997497267137c046e8574 /arch/x86/kernel/apm_32.c | |
| parent | e0463e42d7b73654f39f6a155f82f0b72ad5258a (diff) | |
x86/espfix/xen: Fix allocation of pages for paravirt page tables
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>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'arch/x86/kernel/apm_32.c')
0 files changed, 0 insertions, 0 deletions