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From: Peter Maydell <peter.maydell@linaro.org>
To: Andrew Jones <drjones@redhat.com>
Cc: qemu-arm <qemu-arm@nongnu.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Beata Michalska <beata.michalska@linaro.org>
Subject: Re: [PATCH 0/3] hw/arm/virt: Introduce kvm-steal-time
Date: Mon, 20 Jul 2020 11:16:41 +0100	[thread overview]
Message-ID: <CAFEAcA_F_zJESdsZbsQaD+SLN5HDuL1x9Z=YrxC9kXw1XGvrcg@mail.gmail.com> (raw)
In-Reply-To: <20200711101033.47371-1-drjones@redhat.com>

On Sat, 11 Jul 2020 at 11:10, Andrew Jones <drjones@redhat.com> wrote:
>
> KVM supports the ability to publish the amount of time that VCPUs
> were runnable, but not running due to other host threads running
> instead, to the guest. The guest scheduler may use that information
> when making decisions and the guest may expose it to its userspace
> (Linux publishes this information in /proc/stat). This feature is
> called "steal time" as it represents the amount of time stolen from
> a guest by scheduling out its VCPUs. To enable this feature KVM
> userspace must provide a memory region that will be used to publish
> the information to the guest. The memory region is typical migratable
> region. The GPA of the region is given to KVM through a VCPU device
> ioctl interface. This feature is only available for 64-bit hosts
> running 64-bit guests.
>
> This series provides the QEMU support of this feature. It will
> be enabled by default for 5.1 machine types and later, but may
> be disabled with a new CPU property "kvm-steal-time".

Just a note that this has missed 5.1, but I'll review it at
some point for 5.2.

thanks
-- PMM


  parent reply	other threads:[~2020-07-20 10:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-11 10:10 [PATCH 0/3] hw/arm/virt: Introduce kvm-steal-time Andrew Jones
2020-07-11 10:10 ` [PATCH 1/3] hw/arm/virt: Move post cpu realize check into its own function Andrew Jones
2020-07-21 10:03   ` Peter Maydell
2020-07-11 10:10 ` [PATCH 2/3] hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init Andrew Jones
2020-07-21 10:02   ` Peter Maydell
2020-07-29 13:51     ` Andrew Jones
2020-07-11 10:10 ` [PATCH 3/3] hw/arm/virt: Implement kvm-steal-time Andrew Jones
2020-07-21 10:46   ` Peter Maydell
2020-07-29 14:40     ` Andrew Jones
2020-08-03 15:18       ` Andrew Jones
2020-07-31 14:54   ` Peter Maydell
2020-08-01 12:00     ` Andrew Jones
2020-08-03 15:16       ` Andrew Jones
2020-07-20 10:16 ` Peter Maydell [this message]
2020-07-27  8:33   ` [PATCH 0/3] hw/arm/virt: Introduce kvm-steal-time Andrew Jones

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