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Subject[RFC PATCH v10 0/9] Enable ptp_kvm for arm/arm64
Date
kvm ptp targets to provide high precision time sync between guest
and host in virtualization environment. Here, we enable kvm ptp
for arm64.

change log:
from v10 to v9
(1) change code base to v5.5.
(2) enable ptp_kvm both for arm32 and arm64.
(3) let user choose which of virtual counter or physical counter
should return when using crosstimestamp mode of ptp_kvm for arm/arm64.
(4) extend input argument for getcrosstimestamp API.

from v8 to v9:
(1) move ptp_kvm.h to driver/ptp/
(2) replace license declaration of ptp_kvm.h the same with other
header files in the same directory.

from v7 to v8:
(1) separate adding clocksource id for arm_arch_counter as a
single patch.
(2) update commit message for patch 4/8.
(3) refine patch 7/8 and patch 8/8 to make them more independent.

from v6 to v7:
(1) include the omitted clocksource_id.h in last version.
(2) reorder the header file in patch.
(3) refine some words in commit message to make it more impersonal.

from v5 to v6:
(1) apply Mark's patch[4] to get SMCCC conduit.
(2) add mechanism to recognize current clocksource by add
clocksouce_id value into struct clocksource instead of method in patch-v5.
(3) rename kvm_arch_ptp_get_clock_fn into
kvm_arch_ptp_get_crosststamp.

from v4 to v5:
(1) remove hvc delay compensasion as it should leave to userspace.
(2) check current clocksource in hvc call service.
(3) expose current clocksource by adding it to
system_time_snapshot.
(4) add helper to check if clocksource is arm_arch_counter.
(5) rename kvm_ptp.c to ptp_kvm_common.c

from v3 to v4:
(1) fix clocksource of ptp_kvm to arch_sys_counter.
(2) move kvm_arch_ptp_get_clock_fn into arm_arch_timer.c
(3) subtract cntvoff before return cycles from host.
(4) use ktime_get_snapshot instead of getnstimeofday and
get_current_counterval to return time and counter value.
(5) split ktime and counter into two 32-bit block respectively
to avoid Y2038-safe issue.
(6) set time compensation to device time as half of the delay of
hvc call.
(7) add ARM_ARCH_TIMER as dependency of ptp_kvm for
arm64.

from v2 to v3:
(1) fix some issues in commit log.
(2) add some receivers in send list.

from v1 to v2:
(1) move arch-specific code from arch/ to driver/ptp/
(2) offer mechanism to inform userspace if ptp_kvm service is
available.
(3) separate ptp_kvm code for arm64 into hypervisor part and
guest part.
(4) add API to expose monotonic clock and counter value.
(5) refine code: remove no necessary part and reconsitution.


Jianyong Wu (8):
psci: export psci conduit get helper.
ptp: Reorganize ptp_kvm modules to make it arch-independent.
clocksource: Add clocksource id for arm arch counter
psci: Add hypercall service for ptp_kvm.
ptp: arm/arm64: Enable ptp_kvm for arm/arm64
ptp: extend input argument for getcrosstimestamp API
arm/arm64: add mechanism to let user choose which counter to return
arm/arm64: Add kvm capability check extension for ptp_kvm

Thomas Gleixner (1):
time: Add mechanism to recognize clocksource in time_get_snapshot

drivers/clocksource/arm_arch_timer.c | 33 ++++++++
drivers/firmware/psci/psci.c | 1 +
drivers/net/ethernet/intel/e1000e/ptp.c | 3 +-
drivers/ptp/Kconfig | 2 +-
drivers/ptp/Makefile | 5 ++
drivers/ptp/ptp_chardev.c | 8 +-
drivers/ptp/ptp_kvm.h | 11 +++
drivers/ptp/ptp_kvm_arm.c | 53 +++++++++++++
drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} | 83 ++++++--------------
drivers/ptp/ptp_kvm_x86.c | 87 +++++++++++++++++++++
include/linux/arm-smccc.h | 21 +++++
include/linux/clocksource.h | 6 ++
include/linux/clocksource_ids.h | 13 +++
include/linux/ptp_clock_kernel.h | 3 +-
include/linux/timekeeping.h | 12 +--
include/uapi/linux/kvm.h | 1 +
include/uapi/linux/ptp_clock.h | 4 +-
kernel/time/clocksource.c | 3 +
kernel/time/timekeeping.c | 1 +
virt/kvm/arm/arm.c | 1 +
virt/kvm/arm/hypercalls.c | 44 ++++++++++-
21 files changed, 323 insertions(+), 72 deletions(-)
create mode 100644 drivers/ptp/ptp_kvm.h
create mode 100644 drivers/ptp/ptp_kvm_arm.c
rename drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} (60%)
create mode 100644 drivers/ptp/ptp_kvm_x86.c
create mode 100644 include/linux/clocksource_ids.h

--
2.17.1

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