From: zhukeqian <zhukeqian1@huawei.com>
To: Steven Price <steven.price@arm.com>
Cc: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
<linux-doc@vger.kernel.org>, Russell King <linux@armlinux.org.uk>,
<linux-arm-kernel@lists.infradead.org>,
Marc Zyngier <maz@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Will Deacon <will@kernel.org>, <kvmarm@lists.cs.columbia.edu>,
<xiexiangyou@huawei.com>, <yebiaoxiang@huawei.com>,
"wanghaibin.wang@huawei.com >> Wanghaibin (D)"
<wanghaibin.wang@huawei.com>
Subject: Re: [PATCH 0/9] arm64: Stolen time support
Date: Tue, 21 Jul 2020 11:26:30 +0800 [thread overview]
Message-ID: <1611996b-1ec1-dee7-ed61-b3b9df23f138@huawei.com> (raw)
In-Reply-To: <20190802145017.42543-1-steven.price@arm.com>
Hi Steven,
On 2019/8/2 22:50, Steven Price wrote:
> This series add support for paravirtualized time for arm64 guests and
> KVM hosts following the specification in Arm's document DEN 0057A:
>
> https://developer.arm.com/docs/den0057/a
>
> It implements support for stolen time, allowing the guest to
> identify time when it is forcibly not executing.
>
> It doesn't implement support for Live Physical Time (LPT) as there are
> some concerns about the overheads and approach in the above
Do you plan to pick up LPT support? As there is demand of cross-frequency migration
(from older platform to newer platform).
I am not clear about the overheads and approach problem here, could you please
give some detail information? Maybe we can work together to solve these concerns. :-)
Thanks,
Keqian
> specification, and I expect an updated version of the specification to
> be released soon with just the stolen time parts.
>
> I previously posted a series including LPT (as well as stolen time):
> https://lore.kernel.org/kvmarm/20181212150226.38051-1-steven.price@arm.com/
>
> Patches 2, 5, 7 and 8 are cleanup patches and could be taken separately.
>
> Christoffer Dall (1):
> KVM: arm/arm64: Factor out hypercall handling from PSCI code
>
> Steven Price (8):
> KVM: arm64: Document PV-time interface
> KVM: arm64: Implement PV_FEATURES call
> KVM: arm64: Support stolen time reporting via shared structure
> KVM: Allow kvm_device_ops to be const
> KVM: arm64: Provide a PV_TIME device to user space
> arm/arm64: Provide a wrapper for SMCCC 1.1 calls
> arm/arm64: Make use of the SMCCC 1.1 wrapper
> arm64: Retrieve stolen time as paravirtualized guest
>
> Documentation/virtual/kvm/arm/pvtime.txt | 107 +++++++++++++
> arch/arm/kvm/Makefile | 2 +-
> arch/arm/kvm/handle_exit.c | 2 +-
> arch/arm/mm/proc-v7-bugs.c | 13 +-
> arch/arm64/include/asm/kvm_host.h | 13 +-
> arch/arm64/include/asm/kvm_mmu.h | 2 +
> arch/arm64/include/asm/pvclock-abi.h | 20 +++
> arch/arm64/include/uapi/asm/kvm.h | 6 +
> arch/arm64/kernel/Makefile | 1 +
> arch/arm64/kernel/cpu_errata.c | 80 ++++------
> arch/arm64/kernel/kvm.c | 155 ++++++++++++++++++
> arch/arm64/kvm/Kconfig | 1 +
> arch/arm64/kvm/Makefile | 2 +
> arch/arm64/kvm/handle_exit.c | 4 +-
> include/kvm/arm_hypercalls.h | 44 ++++++
> include/kvm/arm_psci.h | 2 +-
> include/linux/arm-smccc.h | 58 +++++++
> include/linux/cpuhotplug.h | 1 +
> include/linux/kvm_host.h | 4 +-
> include/linux/kvm_types.h | 2 +
> include/uapi/linux/kvm.h | 2 +
> virt/kvm/arm/arm.c | 18 +++
> virt/kvm/arm/hypercalls.c | 138 ++++++++++++++++
> virt/kvm/arm/mmu.c | 44 ++++++
> virt/kvm/arm/psci.c | 84 +---------
> virt/kvm/arm/pvtime.c | 190 +++++++++++++++++++++++
> virt/kvm/kvm_main.c | 6 +-
> 27 files changed, 848 insertions(+), 153 deletions(-)
> create mode 100644 Documentation/virtual/kvm/arm/pvtime.txt
> create mode 100644 arch/arm64/include/asm/pvclock-abi.h
> create mode 100644 arch/arm64/kernel/kvm.c
> create mode 100644 include/kvm/arm_hypercalls.h
> create mode 100644 virt/kvm/arm/hypercalls.c
> create mode 100644 virt/kvm/arm/pvtime.c
>
next prev parent reply other threads:[~2020-07-21 3:26 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 14:50 [PATCH 0/9] arm64: Stolen time support Steven Price
2019-08-02 14:50 ` [PATCH 1/9] KVM: arm64: Document PV-time interface Steven Price
2019-08-03 11:13 ` Marc Zyngier
2019-08-05 13:06 ` Steven Price
2019-08-05 3:23 ` Zenghui Yu
2019-08-05 13:06 ` Steven Price
2019-08-05 16:40 ` Christophe de Dinechin
2019-08-07 13:21 ` Steven Price
[not found] ` <9F77FA64-C71B-4025-A58D-3AC07E6688DE@dinechin.org>
2019-08-07 15:26 ` Steven Price
2019-08-02 14:50 ` [PATCH 2/9] KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price
2019-08-02 14:50 ` [PATCH 3/9] KVM: arm64: Implement PV_FEATURES call Steven Price
2019-08-03 11:21 ` Marc Zyngier
2019-08-05 13:14 ` Steven Price
2019-08-02 14:50 ` [PATCH 4/9] KVM: arm64: Support stolen time reporting via shared structure Steven Price
2019-08-03 11:55 ` Marc Zyngier
2019-08-05 14:09 ` Steven Price
2019-08-03 17:58 ` Marc Zyngier
2019-08-03 18:13 ` Marc Zyngier
2019-08-05 14:18 ` Steven Price
2019-08-02 14:50 ` [PATCH 5/9] KVM: Allow kvm_device_ops to be const Steven Price
2019-08-02 14:50 ` [PATCH 6/9] KVM: arm64: Provide a PV_TIME device to user space Steven Price
2019-08-03 12:51 ` Marc Zyngier
2019-08-03 17:34 ` Marc Zyngier
2019-08-07 13:39 ` Steven Price
2019-08-07 13:51 ` Marc Zyngier
2019-08-05 16:10 ` Steven Price
2019-08-05 16:28 ` Marc Zyngier
2019-08-02 14:50 ` [PATCH 7/9] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Steven Price
2019-08-05 10:03 ` Will Deacon
2019-08-02 14:50 ` [PATCH 8/9] arm/arm64: Make use of the SMCCC 1.1 wrapper Steven Price
2019-08-02 14:50 ` [PATCH 9/9] arm64: Retrieve stolen time as paravirtualized guest Steven Price
2019-08-04 9:53 ` Marc Zyngier
2019-08-08 15:29 ` Steven Price
2019-08-08 15:49 ` Marc Zyngier
2019-08-09 13:51 ` Zenghui Yu
2019-08-12 10:39 ` Steven Price
2019-08-13 6:06 ` Zenghui Yu
2019-08-03 18:05 ` [PATCH 0/9] arm64: Stolen time support Marc Zyngier
2019-08-05 13:06 ` Steven Price
2019-08-05 13:26 ` Marc Zyngier
2019-08-14 13:02 ` Alexander Graf
[not found] ` <8636i3omnd.wl-maz@kernel.org>
2019-08-14 14:52 ` [UNVERIFIED SENDER] " Alexander Graf
2019-08-16 10:23 ` Steven Price
2020-07-21 3:26 ` zhukeqian [this message]
2020-07-27 10:48 ` Steven Price
2020-07-29 2:57 ` zhukeqian
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1611996b-1ec1-dee7-ed61-b3b9df23f138@huawei.com \
--to=zhukeqian1@huawei.com \
--cc=catalin.marinas@arm.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=maz@kernel.org \
--cc=pbonzini@redhat.com \
--cc=steven.price@arm.com \
--cc=wanghaibin.wang@huawei.com \
--cc=will@kernel.org \
--cc=xiexiangyou@huawei.com \
--cc=yebiaoxiang@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).