[PATCH v3 0/7] x86: KVM: svm: get rid of hardcoded instructions lengths

[Vitaly Kuznetsov]

Changes since v2 [Sean Christopherson]:
- Add Reviewed-by tags:
- PATCH2 replaced with the suggested "x86: kvm: svm: propagate errors from
  skip_emulated_instruction()" approach.
- PATCH5 split into three separating vmrun_interception() from others and
  implementing the suggested solution.

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 (7):
  x86: KVM: svm: don't pretend to advance RIP in case
    wrmsr_interception() results in #GP
  x86: kvm: svm: propagate errors from skip_emulated_instruction()
  x86: KVM: clear interrupt shadow on EMULTYPE_SKIP
  x86: KVM: add xsetbv to the emulator
  x86: KVM: svm: remove hardcoded instruction length from intercepts
  x86: KVM: svm: eliminate weird goto from vmrun_interception()
  x86: KVM: svm: eliminate hardcoded RIP advancement from
    vmrun_interception()

 arch/x86/include/asm/kvm_emulate.h |  3 +-
 arch/x86/include/asm/kvm_host.h    |  2 +-
 arch/x86/kvm/emulate.c             | 23 ++++++-
 arch/x86/kvm/svm.c                 | 98 +++++++++++++-----------------
 arch/x86/kvm/vmx/vmx.c             |  8 ++-
 arch/x86/kvm/x86.c                 | 13 +++-
 6 files changed, 83 insertions(+), 64 deletions(-)

-- 
2.20.1