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[PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time
From: |
Andrew Jones |
Subject: |
[PATCH v3 0/5] hw/arm/virt: Introduce kvm-steal-time |
Date: |
Wed, 16 Sep 2020 11:26:15 +0200 |
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 <=
- [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, 2020/09/29