diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-07-23 08:34:11 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-08-07 14:30:26 -0700 |
| commit | e824880110a452575e28a1547b95c5eb2bbb90e8 (patch) | |
| tree | 174f9448ddd87e4beab813833b75cfaccbea9d05 /lib/mpi/mpiutil.c | |
| parent | 044f72e1163f83cab78e92411033c8b6bf06d3de (diff) | |
x86_64/entry/xen: Do not invoke espfix64 on Xen
commit 7209a75d2009dbf7745e2fd354abf25c3deb3ca3 upstream.
This moves the espfix64 logic into native_iret. To make this work,
it gets rid of the native patch for INTERRUPT_RETURN:
INTERRUPT_RETURN on native kernels is now 'jmp native_iret'.
This changes the 16-bit SS behavior on Xen from OOPSing to leaking
some bits of the Xen hypervisor's RSP (I think).
[ hpa: this is a nonzero cost on native, but probably not enough to
measure. Xen needs to fix this in their own code, probably doing
something equivalent to espfix64. ]
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/7b8f1d8ef6597cb16ae004a43c56980a7de3cf94.1406129132.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions