[PATCH v5 0/8] KVM: nVMX: Add full nested support for "load IA32_PERF_GLOBAL_CTRL" VM-{Entry,Exit} control

[Oliver Upton <oupton@google.com>]

[v1] https://lore.kernel.org/r/20190828234134.132704-1-oupton@google.com
[v2] https://lore.kernel.org/r/20190903213044.168494-1-oupton@google.com
[v3] https://lore.kernel.org/r/20190903215801.183193-1-oupton@google.com
[v4] https://lore.kernel.org/r/20190906210313.128316-1-oupton@google.com

v1 => v2:
 - Add Krish's Co-developed-by and Signed-off-by tags.
 - Fix minor nit to kvm-unit-tests to use 'host' local variable
   throughout test_load_pgc()
 - Teach guest_state_test_main() to check guest state from within nested
   VM
 - Update proposed tests to use guest/host state checks, wherein the
   value is checked from MSR_CORE_PERF_GLOBAL_CTRL.
 - Changelog line wrapping

v2 => v3:
 - Remove the value unchanged condition from
   kvm_is_valid_perf_global_ctrl
 - Add line to changelog for patch 3/8

v3 => v4:
 - Allow tests to set the guest func multiple times
 - Style fixes throughout kvm-unit-tests patches, per Krish's review

v4 => v5:
 - Rebased kernel and kvm-unit-tests patches
 - Reordered and reworked patches to now WARN on a failed
   kvm_set_msr()
 - Dropped patch to alow resetting guest in kvm-unit-tests, as the
   functionality is no longer needed.

This patchset exposes the "load IA32_PERF_GLOBAL_CTRL" to guests for nested
VM-entry and VM-exit. There already was some existing code that supported
the VM-exit ctrl, though it had an issue and was not exposed to the guest
anyway. These patches are based on the original set that Krish Sadhukhan
sent out earlier this year.

Oliver Upton (6):
  KVM: nVMX: Expose load IA32_PERF_GLOBAL_CTRL VM-{Entry,Exit} control
  KVM: nVMX: Load GUEST_IA32_PERF_GLOBAL_CTRL MSR on VM-Entry
  KVM: nVMX: Use kvm_set_msr to load IA32_PERF_GLOBAL_CTRL on VM-Exit
  KVM: nVMX: Check HOST_IA32_PERF_GLOBAL_CTRL on VM-Entry
  KVM: nVMX: Check GUEST_IA32_PERF_GLOBAL_CTRL on VM-Entry
  KVM: VMX: Add helper to check reserved bits in IA32_PERF_GLOBAL_CTRL

 arch/x86/kvm/pmu.h           |  6 ++++++
 arch/x86/kvm/vmx/nested.c    | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
 arch/x86/kvm/vmx/nested.h    |  1 +
 arch/x86/kvm/vmx/pmu_intel.c |  5 ++++-

-- 
2.23.0.187.g17f5b7556c-goog