[PATCH 0/2] SVM NMI fixes

[Avi Kivity <avi@redhat.com>]

There are a couple of fairly severe problems with NMI on AMD, both triggered
with nmi_watchdog=1 in the guest and kvm ftrace in the host.  One of the bug
leads to guest userspace crashes via spurious setting of EFLAGS.TF, while the
other leads to guest kernel hangs looping on the NMI handler's IRET
instruction.  I believe ftrace only affects timing here, and is not a real
requirement to reproduce the bug.

See https://bugzilla.redhat.com/show_bug.cgi?id=612436 for the original report.

I will try to write unit tests for both issues.

Avi Kivity (2):
  KVM: Fix race between nmi injection and enabling nmi window
  KVM: SVM: check for progress after IRET interception

 arch/x86/kvm/svm.c       |   10 +++++++++-
 arch/x86/kvm/x86.c       |    4 +++-
 include/linux/kvm_host.h |    1 +
 3 files changed, 13 insertions(+), 2 deletions(-)