[Xen-devel] [PATCH 0/9] x86/vmx: Don't leak EFER.NXE into guest context

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

The purpose of this patchset is to fix a longstanding bug whereby Xen's NXE
setting leaks into HVM context, and has a visible effect on the guests
pagewalk.

To allow patch 9 to function, there are 7 patches of improvements to the MSR
load/save infrastructure, purely to support first-gen VT-x hardware.

Along the way, there is a bugfix to how MSR_DEBUGCTL is handled, noticed while
doing the load/save list improvements.  It really does want backporting to the
stable releases, but I can't find any clean way of disentanging it from the
series.

Andrew Cooper (9):
  x86/vmx: API improvements for MSR load/save infrastructure
  x86/vmx: Internal cleanup for MSR load/save infrastructure
  x86/vmx: Factor locate_msr_entry() out of vmx_find_msr() and vmx_add_msr()
  x86/vmx: Support remote access to the MSR lists
  x86/vmx: Fix handing of MSR_DEBUGCTL on VMExit
  x86/vmx: Pass an MSR value into vmx_msr_add()
  x86/vmx: Support load-only guest MSR list entries
  x86/vmx: Support removing MSRs from the host/guest load/save lists
  x86/vmx: Don't leak EFER.NXE into guest context

 xen/arch/x86/cpu/vpmu_intel.c      |  14 +-
 xen/arch/x86/domain.c              |  10 --
 xen/arch/x86/hvm/vmx/vmcs.c        | 303 ++++++++++++++++++++++++++-----------
 xen/arch/x86/hvm/vmx/vmx.c         | 115 ++++++++++----
 xen/include/asm-x86/hvm/hvm.h      |   4 +-
 xen/include/asm-x86/hvm/vmx/vmcs.h |  84 +++++++---
 6 files changed, 374 insertions(+), 156 deletions(-)

-- 
2.1.4


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