[PATCH v2 0/5] x86: KVM: svm: get rid of hardcoded instructions lengths

From: Vitaly Kuznetsov
Date: Tue Aug 06 2019 - 02:02:35 EST

Changes since v1:
- Clear interrupt shadow in x86_emulate_instruction() instead of SVM's
skip_emulated_instruction() to generalize the fix [Sean Christopherson]

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()
x86: KVM: clear interrupt shadow on EMULTYPE_SKIP
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 | 19 +++++--------------
arch/x86/kvm/x86.c | 7 +++++++
4 files changed, 36 insertions(+), 16 deletions(-)