Re: [Xen-devel] [PATCH v2 0/6] Collected vdso/vsyscall fixes for 3.1

Hello Andy,

Wednesday, August 3, 2011, 3:31:48 PM, you wrote:

This fixes various problems that cropped up with the vdso patches.

 - Patch 1 fixes an information leak to userspace.
 - Patches 2 and 3 fix the kernel build on gold.
 - Patches 4 and 5 fix Xen (I hope).
 - Patch 6 (optional) adds a trace event to vsyscall emulation.  It will
   make it easier to handle performance regression reports :)

[1] https://gitorious.org/linux-test-utils/linux-clock-tests

Changes from v1:
 - Improve changelog message for "x86-64/xen: Enable the vvar mapping"
 - Fix 32-bit build.
 - Add patch 6.

Andy Lutomirski (6):
  x86-64: Pad vDSO to a page boundary
  x86-64: Move the "user" vsyscall segment out of the data segment.
  x86-64: Work around gold bug 13023
  x86-64/xen: Enable the vvar mapping
  x86-64: Add user_64bit_mode paravirt op
  x86-64: Add vsyscall:emulate_vsyscall trace event

 arch/x86/include/asm/desc.h           |    4 +-
 arch/x86/include/asm/paravirt_types.h |    6 ++++
 arch/x86/include/asm/ptrace.h         |   19 +++++++++++++
 arch/x86/kernel/paravirt.c            |    4 +++
 arch/x86/kernel/step.c                |    2 +-
 arch/x86/kernel/vmlinux.lds.S         |   46 ++++++++++++++++++---------------
 arch/x86/kernel/vsyscall_64.c         |   12 +++++---
 arch/x86/kernel/vsyscall_trace.h      |   29 ++++++++++++++++++++
 arch/x86/mm/fault.c                   |    2 +-
 arch/x86/vdso/vdso.S                  |    1 +
 arch/x86/xen/enlighten.c              |    4 +++
 arch/x86/xen/mmu.c                    |    4 ++-
 12 files changed, 102 insertions(+), 31 deletions(-)
 create mode 100644 arch/x86/kernel/vsyscall_trace.h

Compile and boot tested on Xen 4.1.1 and baremetal on x86_64, it fixes my boot panic under Xen.

Tested-by: Sander Eikelenboom <redacted>