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| author | Andy Lutomirski <luto@amacapital.net> | 2014-07-23 08:34:11 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-07-28 15:25:40 -0700 |
| commit | 7209a75d2009dbf7745e2fd354abf25c3deb3ca3 (patch) | |
| tree | e0c3050ed85e8d10aff456f7fa43eec73cbad4ca /arch/x86/kernel/pci-calgary_64.c | |
| parent | 64aa90f26c06e1cb2aacfb98a7d0eccfbd6c1a91 (diff) | |
| download | blackbird-op-linux-7209a75d2009dbf7745e2fd354abf25c3deb3ca3.tar.gz blackbird-op-linux-7209a75d2009dbf7745e2fd354abf25c3deb3ca3.zip | |
x86_64/entry/xen: Do not invoke espfix64 on Xen
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>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'arch/x86/kernel/pci-calgary_64.c')
0 files changed, 0 insertions, 0 deletions
