[Qemu-devel] [PATCH v7 00/12] More fully implement ARM PMUv3

[Aaron Lindsay <aaron@os.amperecomputing.com>]

The ARM PMU implementation currently contains a basic cycle counter, but
it is often useful to gather counts of other events, filter them based
on execution mode, and/or be notified on counter overflow. These patches
flesh out the implementations of various PMU registers including
PM[X]EVCNTR and PM[X]EVTYPER, add a struct definition to represent
arbitrary counter types, implement mode filtering, send interrupts on
counter overflow, and add instruction, cycle, and software increment
events.

Since v6 [1] I have made the following changes:
* Use cpu_get_host_ticks() for the cycle counter value for user mode
* Re-staged "PMU: Set PMCR.N to 4" so that the value of the pmcrn local
  variable matches the architectural value of PMCR.N
* Re-ordered "Reorganize PMCCNTR accesses" to come first to eliminate
  the churn of *_op_start/finish function names and definitions
* Use extract64 and ARRAY_SIZE macros where applicable
* Add a return value to the post_save migration function

[1] - https://lists.gnu.org/archive/html/qemu-devel/2018-10/msg02036.html

Aaron Lindsay (12):
  migration: Add post_save function to VMStateDescription
  target/arm: Reorganize PMCCNTR accesses
  target/arm: Swap PMU values before/after migrations
  target/arm: Filter cycle counter based on PMCCFILTR_EL0
  target/arm: Allow AArch32 access for PMCCFILTR
  target/arm: Implement PMOVSSET
  target/arm: Add array for supported PMU events, generate PMCEID[01]
  target/arm: Finish implementation of PM[X]EVCNTR and PM[X]EVTYPER
  target/arm: PMU: Add instruction and cycle events
  target/arm: PMU: Set PMCR.N to 4
  target/arm: Implement PMSWINC
  target/arm: Send interrupts on PMU counter overflow

 docs/devel/migration.rst    |   9 +-
 include/migration/vmstate.h |   1 +
 migration/vmstate.c         |  13 +-
 target/arm/cpu.c            |  28 +-
 target/arm/cpu.h            |  68 +++-
 target/arm/cpu64.c          |   4 -
 target/arm/helper.c         | 774 ++++++++++++++++++++++++++++++++----
 target/arm/machine.c        |  20 +
 8 files changed, 816 insertions(+), 101 deletions(-)

-- 
2.19.1