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Subject[RFC PATCH v4 0/6] Enable ptp_kvm for arm64
Date
kvm ptp targets to provide high precision time sync between guest
and host in virtualization environment. This patch enable kvm ptp
for arm64.
This patch set base on [1][2][3]

change log:
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.

[1]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=125ea89e4a21e2fc5235410f966a996a1a7148bf
[2]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=464f5a1741e5959c3e4d2be1966ae0093b4dce06
[3]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=6597490e005d0eeca8ed8c1c1d7b4318ee014681

Jianyong Wu (5):
psci: Export psci_ops.conduit symbol as modules will use it.
ptp: Reorganize ptp_kvm modules to make it arch-independent.
psci: Add hvc call service for ptp_kvm.
ptp: arm64: Enable ptp_kvm for arm64
kvm: arm64: Add capability check extension for ptp_kvm

drivers/clocksource/arm_arch_timer.c | 28 +++++++++
drivers/firmware/psci/psci.c | 6 ++
drivers/ptp/Kconfig | 2 +-
drivers/ptp/Makefile | 1 +
drivers/ptp/{ptp_kvm.c => kvm_ptp.c} | 79 +++++++------------------
drivers/ptp/ptp_kvm_arm64.c | 73 +++++++++++++++++++++++
drivers/ptp/ptp_kvm_x86.c | 87 ++++++++++++++++++++++++++++
include/asm-generic/ptp_kvm.h | 12 ++++
include/linux/arm-smccc.h | 14 ++++-
include/linux/psci.h | 1 +
include/uapi/linux/kvm.h | 1 +
virt/kvm/arm/arm.c | 1 +
virt/kvm/arm/psci.c | 18 ++++++
13 files changed, 262 insertions(+), 61 deletions(-)
rename drivers/ptp/{ptp_kvm.c => kvm_ptp.c} (63%)
create mode 100644 drivers/ptp/ptp_kvm_arm64.c
create mode 100644 drivers/ptp/ptp_kvm_x86.c
create mode 100644 include/asm-generic/ptp_kvm.h

--
2.17.1

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