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Re: [PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time
From: |
Andrew Jones |
Subject: |
Re: [PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time |
Date: |
Tue, 29 Sep 2020 16:47:33 +0200 |
Hi Peter, Eric, and other interested parties,
Here's a gentle ping for reviewers.
Thanks,
drew
On Wed, Sep 16, 2020 at 11:26:15AM +0200, Andrew Jones wrote:
> Previous posting:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg727588.html
>
> v3:
> - Rebased: 5.2 machine type and kvm32 drop now included
> - Switched to using new KVM cap that has been merged upstream
> - Picked up some r-b's and some of Eric's comments from v2
>
> 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 guests
> per the Arm PVTIME specification (DEN0057A).
>
> This series provides the QEMU support of this feature. It will
> be enabled by default for 5.2 machine types and later, but may
> be disabled with a new CPU property "kvm-steal-time".
>
> Thanks,
> drew
>
>
> Andrew Jones (5):
> target/arm/kvm: Make uncalled stubs explicitly unreachable
> hw/arm/virt: Move post cpu realize check into its own function
> hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init
> DO NOT MERGE: HACK: Add steal time KVM cap to kvm.h
> hw/arm/virt: Implement kvm-steal-time
>
> docs/system/arm/cpu-features.rst | 11 ++++
> hw/arm/virt.c | 110 ++++++++++++++++++++++---------
> include/hw/arm/virt.h | 5 ++
> linux-headers/linux/kvm.h | 1 +
> target/arm/cpu.c | 8 +++
> target/arm/cpu.h | 4 ++
> target/arm/kvm.c | 16 +++++
> target/arm/kvm64.c | 64 ++++++++++++++++--
> target/arm/kvm_arm.h | 94 ++++++++++++++++++++------
> target/arm/monitor.c | 2 +-
> tests/qtest/arm-cpu-features.c | 25 +++++--
> 11 files changed, 281 insertions(+), 59 deletions(-)
>
> --
> 2.26.2
>
- [PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time, Andrew Jones, 2020/09/16
- [PATCH v3 2/5] hw/arm/virt: Move post cpu realize check into its own function, Andrew Jones, 2020/09/16
- [PATCH v3 3/5] hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init, Andrew Jones, 2020/09/16
- [PATCH v3 1/5] target/arm/kvm: Make uncalled stubs explicitly unreachable, Andrew Jones, 2020/09/16
- [PATCH v3 4/5] DO NOT MERGE: HACK: Add steal time KVM cap to kvm.h, Andrew Jones, 2020/09/16
- [PATCH v3 5/5] hw/arm/virt: Implement kvm-steal-time, Andrew Jones, 2020/09/16
- Re: [PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time,
Andrew Jones <=