From: Zenghui Yu <yuzenghui@huawei.com>
To: Steven Price <steven.price@arm.com>,
Marc Zyngier <maz@kernel.org>, "Will Deacon" <will@kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<kvmarm@lists.cs.columbia.edu>
Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Russell King <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v4 05/10] KVM: arm64: Support stolen time reporting via shared structure
Date: Tue, 3 Sep 2019 17:14:18 +0800 [thread overview]
Message-ID: <d55d091f-1c0f-9c47-b7b2-95c87285335d@huawei.com> (raw)
In-Reply-To: <20190830084255.55113-6-steven.price@arm.com>
On 2019/8/30 16:42, Steven Price wrote:
> Implement the service call for configuring a shared structure between a
> VCPU and the hypervisor in which the hypervisor can write the time
> stolen from the VCPU's execution time by other tasks on the host.
>
> The hypervisor allocates memory which is placed at an IPA chosen by user
> space.
It seems that no allocation happens in the hypervisor code. User space
will do it instead?
> The hypervisor then updates the shared structure using
> kvm_put_guest() to ensure single copy atomicity of the 64-bit value
> reporting the stolen time in nanoseconds.
>
> Whenever stolen time is enabled by the guest, the stolen time counter is
> reset.
>
> The stolen time itself is retrieved from the sched_info structure
> maintained by the Linux scheduler code. We enable SCHEDSTATS when
> selecting KVM Kconfig to ensure this value is meaningful.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
Thanks,
zenghui
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
next prev parent reply other threads:[~2019-09-03 9:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 8:42 [PATCH v4 00/10] arm64: Stolen time support Steven Price
2019-08-30 8:42 ` [PATCH v4 01/10] KVM: arm64: Document PV-time interface Steven Price
2019-08-30 14:47 ` Andrew Jones
2019-08-30 15:25 ` Steven Price
2019-09-02 12:52 ` Andrew Jones
2019-09-04 13:55 ` Steven Price
2019-09-04 14:22 ` Andrew Jones
2019-09-04 15:07 ` Steven Price
2019-08-30 8:42 ` [PATCH v4 02/10] KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price
2019-09-02 7:06 ` kbuild test robot
2019-09-04 15:05 ` Steven Price
2019-09-02 13:07 ` kbuild test robot
2019-08-30 8:42 ` [PATCH v4 03/10] KVM: arm64: Implement PV_FEATURES call Steven Price
2019-08-30 8:42 ` [PATCH v4 04/10] KVM: Implement kvm_put_guest() Steven Price
2019-08-30 8:42 ` [PATCH v4 05/10] KVM: arm64: Support stolen time reporting via shared structure Steven Price
2019-08-30 9:42 ` Christoffer Dall
2019-08-30 9:52 ` Steven Price
2019-09-03 9:14 ` Zenghui Yu [this message]
2019-09-04 15:53 ` Steven Price
2019-08-30 8:42 ` [PATCH v4 06/10] KVM: Allow kvm_device_ops to be const Steven Price
2019-08-30 8:42 ` [PATCH v4 07/10] KVM: arm64: Provide VCPU attributes for stolen time Steven Price
2019-08-30 10:02 ` Marc Zyngier
2019-08-30 15:04 ` Steven Price
2019-08-30 8:42 ` [PATCH v4 08/10] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Steven Price
2019-08-30 8:42 ` [PATCH v4 09/10] arm/arm64: Make use of the SMCCC 1.1 wrapper Steven Price
2019-08-30 8:42 ` [PATCH v4 10/10] arm64: Retrieve stolen time as paravirtualized guest Steven Price
2019-09-03 8:47 ` Andrew Jones
2019-09-04 16:01 ` Steven Price
2019-09-03 8:03 ` [PATCH v4 00/10] arm64: Stolen time support Andrew Jones
2019-09-03 8:49 ` Andrew Jones
2019-09-04 16:02 ` Steven Price
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=d55d091f-1c0f-9c47-b7b2-95c87285335d@huawei.com \
--to=yuzenghui@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=will@kernel.org \
/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).