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Date: Fri, 27 Mar 2020 09:35:07 +0000
From: Jianyong Wu <Jianyong.Wu@....com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"yangbo.lu@....com" <yangbo.lu@....com>,
"john.stultz@...aro.org" <john.stultz@...aro.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"pbonzini@...hat.com" <pbonzini@...hat.com>,
"sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
"maz@...nel.org" <maz@...nel.org>,
"richardcochran@...il.com" <richardcochran@...il.com>,
Mark Rutland <Mark.Rutland@....com>,
"will@...nel.org" <will@...nel.org>,
Suzuki Poulose <Suzuki.Poulose@....com>,
Steven Price <Steven.Price@....com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
Steve Capper <Steve.Capper@....com>,
Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>,
nd <nd@....com>
Subject: RE: [RFC PATCH v10 0/9] Enable ptp_kvm for arm/arm64
Hi ,
Ping ...
Is there any comments.
Need some comments to move forward.
Thanks
Jianyong
> -----Original Message-----
> From: Jianyong Wu <Jianyong.Wu@....com>
> Sent: Monday, February 17, 2020 10:29 AM
> To: Jianyong Wu <Jianyong.Wu@....com>; netdev@...r.kernel.org;
> yangbo.lu@....com; john.stultz@...aro.org; tglx@...utronix.de;
> pbonzini@...hat.com; sean.j.christopherson@...el.com; maz@...nel.org;
> richardcochran@...il.com; Mark Rutland <Mark.Rutland@....com>;
> will@...nel.org; Suzuki Poulose <Suzuki.Poulose@....com>; Steven Price
> <Steven.Price@....com>
> Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> kvmarm@...ts.cs.columbia.edu; kvm@...r.kernel.org; Steve Capper
> <Steve.Capper@....com>; Kaly Xin <Kaly.Xin@....com>; Justin He
> <Justin.He@....com>; nd <nd@....com>
> Subject: RE: [RFC PATCH v10 0/9] Enable ptp_kvm for arm/arm64
>
> Hi,
> As this version change a lot, expect more comments. thanks.
>
> Thanks
> Jianyong
> > -----Original Message-----
> > From: Jianyong Wu <jianyong.wu@....com>
> > Sent: Monday, February 10, 2020 4:49 PM
> > To: netdev@...r.kernel.org; yangbo.lu@....com; john.stultz@...aro.org;
> > tglx@...utronix.de; pbonzini@...hat.com;
> > sean.j.christopherson@...el.com; maz@...nel.org;
> > richardcochran@...il.com; Mark Rutland <Mark.Rutland@....com>;
> > will@...nel.org; Suzuki Poulose <Suzuki.Poulose@....com>; Steven Price
> > <Steven.Price@....com>
> > Cc: linux-kernel@...r.kernel.org;
> > linux-arm-kernel@...ts.infradead.org;
> > kvmarm@...ts.cs.columbia.edu; kvm@...r.kernel.org; Steve Capper
> > <Steve.Capper@....com>; Kaly Xin <Kaly.Xin@....com>; Justin He
> > <Justin.He@....com>; Jianyong Wu <Jianyong.Wu@....com>; nd
> > <nd@....com>
> > Subject: [RFC PATCH v10 0/9] Enable ptp_kvm for arm/arm64
> >
> > 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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