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[Qemu-devel] [RFC PATCH 0/7] target/i386: support VMX features in "-cpu"

From: Paolo Bonzini
Subject: [Qemu-devel] [RFC PATCH 0/7] target/i386: support VMX features in "-cpu"
Date: Tue, 2 Jul 2019 17:01:14 +0200

This series adds support for VMX feature flags so that the user can
enable and disable at will the flags.  In the final version I will
also add VMX features to named CPU models, which will complete VMX
live migration support.  That's somewhat tedious and I didn't want
to do that before getting a general review.

There are a few complications, which are tackled across the series:

- KVM ioctls fail for some invalid MSR settings, namely when some
  controls are reported as available but the corresponding CPUID
  bits have been disabled.  For backwards compatibility with
  e.g. "-cpu host,-rdrand", these VMX features are silently
  dropped (patch 2)

- some VMX MSRs have features in the high 32 bits (patch 3)

- some VMX MSRs have values in the high 32 bits, but only
  actually have 32 features; this is handled in patch 6 by
  mangling the result of KVM_GET_MSRS

- KVM has a couple bugs that can be worked around relatively
  easily (patch 6 and 7)

Please review!


Paolo Bonzini (7):
  target/i386: handle filtered_features in a new function
  target/i386: introduce generic feature dependency mechanism
  target/i386: expand feature words to 64 bits
  target/i386: add VMX definitions
  vmxcap: correct the name of the variables
  target/i386: add VMX features
  target/i386: work around KVM_GET_MSRS bug for secondary execution

 include/sysemu/kvm.h |   2 +-
 scripts/kvm/vmxcap   |  14 +-
 target/i386/cpu.c    | 433 ++++++++++++++++++++++++++++++++++++++++-----------
 target/i386/cpu.h    | 138 +++++++++++++++-
 target/i386/kvm.c    | 173 +++++++++++++++++++-
 5 files changed, 656 insertions(+), 104 deletions(-)


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