[PATCH 0/5] x86: KVM: svm: get rid of hardcoded instructions lengths

[Vitaly Kuznetsov]

Changes since RFC (It's been awhile and I apologize for that):
- Dropped ' + 3' from vmrun_interception() as well.
- Added xsetbv's implementation to the emulator [Paolo Bonzini]
- Added Jim's R-b tags to PATCHes 2 and 3. 
- Tested with the newly added 'nrips' svm module parameter.

Original description:

Jim rightfully complains that hardcoding instuctions lengths is not always
correct: additional (redundant) prefixes can be used. Luckily, the ugliness
is mostly harmless: modern AMD CPUs support NRIP_SAVE feature but I'd like
to clean things up and sacrifice speed in favor of correctness.

Vitaly Kuznetsov (5):
  x86: KVM: svm: don't pretend to advance RIP in case
    wrmsr_interception() results in #GP
  x86: KVM: svm: avoid flooding logs when skip_emulated_instruction()
    fails
  x86: KVM: svm: clear interrupt shadow on all paths in
    skip_emulated_instruction()
  x86: KVM: add xsetbv to the emulator
  x86: KVM: svm: remove hardcoded instruction length from intercepts

 arch/x86/include/asm/kvm_emulate.h |  3 ++-
 arch/x86/kvm/emulate.c             | 23 ++++++++++++++++++++++-
 arch/x86/kvm/svm.c                 | 23 ++++++++---------------
 arch/x86/kvm/x86.c                 |  6 ++++++
 4 files changed, 38 insertions(+), 17 deletions(-)

-- 
2.20.1