[Qemu-devel] [PATCH V2 0/2] Add option to configure guest vPMU

[Wei Huang <wei@redhat.com>]

This patchset adds a pmu=[on/off] option to enable/disable vPMU support 
for guest VM. There are several reasons to justify this option. First,
vPMU can be problematic for cross-migration between different SoC as perf
counters are architecture-dependent. It is more flexible to have an option
to turn it on/off. Secondly Secondly this option matches the "pmu" option
as supported in libvirt. To make sure backward compatible, a PMU property
is added to mach-virt machine types.

V1->V2:
  * keep the original field name as "has_pmu"
  * add a warning message when PMU is turned on without KVM
  * use the feature bit to check PMU availability, instead of using has_pmu
  * add PMU compat support to mach-virt machine type

RFC->V1:
  * set default pmu=off
  * change struct ARMCPU field name "has_pmu" ==> "has_host_pmu"
  * like el3, add a new feature ARM_FEATURE_HOST_PMU
  * "pmu" property becomes CPU dependent. Only cortex-a53/cortex-a57/host
    running on kvm supports this option.

-Wei

Wei Huang (2):
  arm64: Add an option to turn on/off vPMU support
  arm: virt: add PMU property to machvirt machine type

 hw/arm/virt-acpi-build.c |  2 +-
 hw/arm/virt.c            | 14 +++++++++++++-
 target-arm/cpu.c         | 22 ++++++++++++++++++++++
 target-arm/cpu.h         |  1 +
 target-arm/cpu64.c       |  2 ++
 target-arm/kvm64.c       | 17 +++++++++++++----
 6 files changed, 52 insertions(+), 6 deletions(-)

-- 
1.8.3.1