[PATCH V2 00/11] target/i386: Misc PMU, PEBS, and MSR fixes and improvements

[Zide Chen <zide.chen@intel.com>]

This series contains a set of fixes, cleanups, and improvements in
target/i386 related to PMU, legacy PEBS, and MSR handling.

The patches are grouped into a single series for review convenience.
Smoe of them are not tightly coupled and can be reviewed and applied
individually.

Technically, the PEBS-related changes could be split into a separate
series.  However, they touch closely related PMU and MSR code paths,
and keeping them together here makes review easier and helps avoid
potential merge conflicts.

Patch series overview:
Patches 1–5: Miscellaneous PMU/MSR fixes and cleanups.
Patches 8–9: Refactoring in preparation for pebs-fmt support.
Patches 6–7, 10–11: Complete legacy PEBS support in QEMU.

Changes since v1:
- Add two new patches to clean up and refactor LBR format handling.
- Introduce a new pebs-fmt command-line option.
- Add a patch to avoid exposing PEBS capabilities when not enabled.
- Trivial fixes and cleanups.

Dapeng Mi (3):
  target/i386: Don't save/restore PERF_GLOBAL_OVF_CTRL MSR
  target/i386: Support full-width writes for perf counters
  target/i386: Save/Restore DS based PEBS specfic MSRs

Zide Chen (8):
  target/i386: Disable unsupported BTS for guest
  target/i386: Gate enable_pmu on kvm_enabled()
  target/i386: Increase MSR_BUF_SIZE and split KVM_[GET/SET]_MSRS calls
  target/i386: Make some PEBS features user-visible
  target/i386: Clean up LBR format handling
  target/i386: Refactor LBR format handling
  target/i386: Add pebs-fmt CPU option
  target/i386: Disable guest PEBS capability when not enabled

 target/i386/cpu.c         | 130 ++++++++++++++++++++----------
 target/i386/cpu.h         |  29 ++++++-
 target/i386/kvm/kvm-cpu.c |   3 +
 target/i386/kvm/kvm.c     | 163 +++++++++++++++++++++++++++++++-------
 target/i386/machine.c     |  35 ++++++--
 5 files changed, 281 insertions(+), 79 deletions(-)

-- 
2.52.0