From patchwork Thu Sep 26 11:42:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianyong Wu X-Patchwork-Id: 11162627 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B128E924 for ; Thu, 26 Sep 2019 11:42:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90833222C3 for ; Thu, 26 Sep 2019 11:42:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726645AbfIZLmq (ORCPT ); Thu, 26 Sep 2019 07:42:46 -0400 Received: from foss.arm.com ([217.140.110.172]:47150 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726463AbfIZLmo (ORCPT ); Thu, 26 Sep 2019 07:42:44 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 86AC61570; Thu, 26 Sep 2019 04:42:43 -0700 (PDT) Received: from entos-d05.shanghai.arm.com (entos-d05.shanghai.arm.com [10.169.40.35]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EE8633F67D; Thu, 26 Sep 2019 04:42:38 -0700 (PDT) From: Jianyong Wu To: netdev@vger.kernel.org, yangbo.lu@nxp.com, john.stultz@linaro.org, tglx@linutronix.de, pbonzini@redhat.com, sean.j.christopherson@intel.com, maz@kernel.org, richardcochran@gmail.com, Mark.Rutland@arm.com, Will.Deacon@arm.com, suzuki.poulose@arm.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Steve.Capper@arm.com, Kaly.Xin@arm.com, justin.he@arm.com, jianyong.wu@arm.com, nd@arm.com Subject: [RFC PATCH v4 4/5] ptp: arm64: Enable ptp_kvm for arm64 Date: Thu, 26 Sep 2019 19:42:11 +0800 Message-Id: <20190926114212.5322-5-jianyong.wu@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190926114212.5322-1-jianyong.wu@arm.com> References: <20190926114212.5322-1-jianyong.wu@arm.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Currently in arm64 virtualization environment, there is no mechanism to keep time sync between guest and host. Time in guest will drift compared with host after boot up as they may both use third party time sources to correct their time respectively. The time deviation will be in order of milliseconds but some scenarios ask for higher time precision, like in cloud envirenment, we want all the VMs running in the host aquire the same level accuracy from host clock. Use of kvm ptp clock, which choose the host clock source clock as a reference clock to sync time clock between guest and host has been adopted by x86 which makes the time sync order from milliseconds to nanoseconds. This patch enable kvm ptp on arm64 and we get the similar clock drift as found with x86 with kvm ptp. Test result comparison between with kvm ptp and without it in arm64 are as follows. This test derived from the result of command 'chronyc sources'. we should take more cure of the last sample column which shows the offset between the local clock and the source at the last measurement. no kvm ptp in guest: MS Name/IP address Stratum Poll Reach LastRx Last sample ======================================================================== ^* dns1.synet.edu.cn 2 6 377 13 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 21 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 29 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 37 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 45 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 53 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 61 +1040us[+1581us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 4 -130us[ +796us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 12 -130us[ +796us] +/- 21ms ^* dns1.synet.edu.cn 2 6 377 20 -130us[ +796us] +/- 21ms in host: MS Name/IP address Stratum Poll Reach LastRx Last sample ======================================================================== ^* 120.25.115.20 2 7 377 72 -470us[ -603us] +/- 18ms ^* 120.25.115.20 2 7 377 92 -470us[ -603us] +/- 18ms ^* 120.25.115.20 2 7 377 112 -470us[ -603us] +/- 18ms ^* 120.25.115.20 2 7 377 2 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 22 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 43 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 63 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 83 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 103 +872ns[-6808ns] +/- 17ms ^* 120.25.115.20 2 7 377 123 +872ns[-6808ns] +/- 17ms The dns1.synet.edu.cn is the network reference clock for guest and 120.25.115.20 is the network reference clock for host. we can't get the clock error between guest and host directly, but a roughly estimated value will be in order of hundreds of us to ms. with kvm ptp in guest: chrony has been disabled in host to remove the disturb by network clock. MS Name/IP address Stratum Poll Reach LastRx Last sample ======================================================================== * PHC0 0 3 377 8 -7ns[ +1ns] +/- 3ns * PHC0 0 3 377 8 +1ns[ +16ns] +/- 3ns * PHC0 0 3 377 6 -4ns[ -0ns] +/- 6ns * PHC0 0 3 377 6 -8ns[ -12ns] +/- 5ns * PHC0 0 3 377 5 +2ns[ +4ns] +/- 4ns * PHC0 0 3 377 13 +2ns[ +4ns] +/- 4ns * PHC0 0 3 377 12 -4ns[ -6ns] +/- 4ns * PHC0 0 3 377 11 -8ns[ -11ns] +/- 6ns * PHC0 0 3 377 10 -14ns[ -20ns] +/- 4ns * PHC0 0 3 377 8 +4ns[ +5ns] +/- 4ns The PHC0 is the ptp clock which choose the host clock as its source clock. So we can be sure to say that the clock error between host and guest is in order of ns. Signed-off-by: Jianyong Wu --- drivers/clocksource/arm_arch_timer.c | 28 +++++++++++ drivers/ptp/Kconfig | 2 +- drivers/ptp/kvm_ptp.c | 4 +- drivers/ptp/ptp_kvm_arm64.c | 73 ++++++++++++++++++++++++++++ include/asm-generic/ptp_kvm.h | 2 +- 5 files changed, 106 insertions(+), 3 deletions(-) create mode 100644 drivers/ptp/ptp_kvm_arm64.c diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 07e57a49d1e8..7a99673e4149 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -1633,4 +1633,32 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) return arch_timer_common_init(); } TIMER_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); + +#if IS_ENABLED(CONFIG_PTP_1588_CLOCK_KVM) +#include +int kvm_arch_ptp_get_clock_fn(long *cycle, struct timespec64 *ts, + struct clocksource **cs) +{ + u64 t1, t2; + struct arm_smccc_res hvc_res; + ktime_t ktime_overall; + + t1 = sched_clock(); + arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID, &hvc_res); + t2 = sched_clock(); + t2 -= t1; + t2 /= 2; + if ((long)(hvc_res.a0) < 0) + return -EOPNOTSUPP; + + ktime_overall = hvc_res.a0 << 32 | hvc_res.a1; + *ts = ktime_to_timespec64(ktime_overall); + timespec64_add_ns(ts, t2); + *cycle = hvc_res.a2 << 32 | hvc_res.a3; + *cs = &clocksource_counter; + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_arch_ptp_get_clock_fn); +#endif #endif diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig index 9b8fee5178e8..3c31ff8eb05f 100644 --- a/drivers/ptp/Kconfig +++ b/drivers/ptp/Kconfig @@ -110,7 +110,7 @@ config PTP_1588_CLOCK_PCH config PTP_1588_CLOCK_KVM tristate "KVM virtual PTP clock" depends on PTP_1588_CLOCK - depends on KVM_GUEST && X86 + depends on KVM_GUEST && X86 || ARM64 && ARM_ARCH_TIMER default y help This driver adds support for using kvm infrastructure as a PTP diff --git a/drivers/ptp/kvm_ptp.c b/drivers/ptp/kvm_ptp.c index d8f215186904..b467e1674a71 100644 --- a/drivers/ptp/kvm_ptp.c +++ b/drivers/ptp/kvm_ptp.c @@ -22,6 +22,8 @@ struct kvm_ptp_clock { struct ptp_clock_info caps; }; +//extern int kvm_arch_ptp_get_clock_fn(long *cycle, struct timespec64 *ts, +// struct clocksource **cs) DEFINE_SPINLOCK(kvm_ptp_lock); static int ptp_kvm_get_time_fn(ktime_t *device_time, @@ -138,7 +140,7 @@ static int __init ptp_kvm_init(void) int ret; ret = kvm_arch_ptp_init(); - if (!ret) + if (ret) return -EOPNOTSUPP; kvm_ptp_clock.caps = ptp_kvm_caps; diff --git a/drivers/ptp/ptp_kvm_arm64.c b/drivers/ptp/ptp_kvm_arm64.c new file mode 100644 index 000000000000..e0c993847293 --- /dev/null +++ b/drivers/ptp/ptp_kvm_arm64.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Virtual PTP 1588 clock for use with KVM guests + * Copyright (C) 2019 ARM Ltd. + * All Rights Reserved + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct system_counterval_t ptp_sc; + +/* + * as trap call cause delay, this function will return the delay in nanosecond + */ +static u64 arm_smccc_1_1_invoke_delay(u32 id, struct arm_smccc_res *res) +{ + u64 t1, t2; + + t1 = sched_clock(); + arm_smccc_1_1_invoke(id, res); + t2 = sched_clock(); + t2 -= t1; + t2 /= 2; + + return t2; +} + +int kvm_arch_ptp_init(void) +{ + struct arm_smccc_res hvc_res; + + arm_smccc_1_1_invoke_delay(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID, + &hvc_res); + if ((long)(hvc_res.a0) < 0) + return -EOPNOTSUPP; + + return 0; +} + +int kvm_arch_ptp_get_clock_generic(struct timespec64 *ts, + struct arm_smccc_res *hvc_res) +{ + u64 ns; + ktime_t ktime_overall; + + ns = arm_smccc_1_1_invoke_delay(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID, + hvc_res); + if ((long)(hvc_res->a0) < 0) + return -EOPNOTSUPP; + + ktime_overall = hvc_res->a0 << 32 | hvc_res->a1; + *ts = ktime_to_timespec64(ktime_overall); + timespec64_add_ns(ts, ns); + + return 0; +} + +int kvm_arch_ptp_get_clock(struct timespec64 *ts) +{ + struct arm_smccc_res hvc_res; + + kvm_arch_ptp_get_clock_generic(ts, &hvc_res); + + return 0; +} diff --git a/include/asm-generic/ptp_kvm.h b/include/asm-generic/ptp_kvm.h index 208e842bfa64..829d76bdb905 100644 --- a/include/asm-generic/ptp_kvm.h +++ b/include/asm-generic/ptp_kvm.h @@ -8,5 +8,5 @@ int kvm_arch_ptp_init(void); int kvm_arch_ptp_get_clock(struct timespec64 *ts); -int kvm_arch_ptp_get_clock_fn(long *cycle, +int kvm_arch_ptp_get_clock_fn(unsigned long *cycle, struct timespec64 *tspec, void *cs);