KVM: X86: A few fixes around ignore_msrs

Currently ignore_msrs and report_ignored_msrs have a few issues:

- Errors could be dumped to dmesg even if the msr access is triggered inside kvm itself (e.g., kvm_cpuid), while what we really want to trap should be either guest msr accesses, or KVM_SET_MSRS.

- These two parameters didn't apply to feature msrs.

Each of the patch in this series tries to handle one of the issues.

Here KVM_MSR_RET_INVALID is introduced. Ideally it can be an enum with both 0/1 defined too, but I'll see whether there's any feedback first about this version.

This originates from a discussion between Paolo and me on an unexpected warning msr access message that triggered on a RT system, which seemed to have caused some system jitters.

Please have a look, thanks.

Peter Xu (2):
KVM: X86: Move ignore_msrs handling upper the stack
KVM: X86: Do the same ignore_msrs check for feature msrs

 arch/x86/kvm/svm/svm.c |  2 +-
 arch/x86/kvm/vmx/vmx.c |  2 +-
 arch/x86/kvm/x86.c     | 90 +++++++++++++++++++++++++++++-------------
 arch/x86/kvm/x86.h     |  2 +
 4 files changed, 66 insertions(+), 30 deletions(-)

2.26.2