From: Andrew Jones <drjones@redhat.com>
To: qemu-devel@nongnu.org, qemu-arm@nongnu.org
Cc: peter.maydell@linaro.org, eric.auger@redhat.com
Subject: [PATCH v4 0/6] hw/arm/virt: Introduce kvm-steal-time
Date: Thu, 1 Oct 2020 08:17:12 +0200 [thread overview]
Message-ID: <20201001061718.101915-1-drjones@redhat.com> (raw)
v4:
- Rebased to latest master
- Added an official linux header synch patch, replacing the
hack patch used in v3
- Added a patch to restore the arm-cpu-features test for AArch64
that got lost in the meson shuffle
- Added Eric's R-b's
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
v2: https://www.mail-archive.com/qemu-devel@nongnu.org/msg727588.html
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 (6):
linux headers: sync to 5.9-rc7
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
tests/qtest: Restore aarch64 arm-cpu-features test
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 | 6 +-
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 +++++--
tests/qtest/meson.build | 3 +-
12 files changed, 286 insertions(+), 62 deletions(-)
--
2.26.2
next reply other threads:[~2020-10-01 6:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 6:17 Andrew Jones [this message]
2020-10-01 6:17 ` [PATCH v4 1/6] linux headers: sync to 5.9-rc7 Andrew Jones
2020-10-01 6:17 ` [PATCH v4 2/6] target/arm/kvm: Make uncalled stubs explicitly unreachable Andrew Jones
2020-10-01 6:17 ` [PATCH v4 3/6] hw/arm/virt: Move post cpu realize check into its own function Andrew Jones
2020-10-01 6:17 ` [PATCH v4 4/6] hw/arm/virt: Move kvm pmu setup to virt_cpu_post_init Andrew Jones
2020-10-01 6:17 ` [PATCH v4 5/6] tests/qtest: Restore aarch64 arm-cpu-features test Andrew Jones
2020-10-01 6:17 ` [PATCH v4 6/6] hw/arm/virt: Implement kvm-steal-time Andrew Jones
2020-10-08 20:39 ` Peter Maydell
2020-10-08 21:12 ` Andrew Jones
2020-10-08 13:01 ` [PATCH v4 0/6] hw/arm/virt: Introduce kvm-steal-time Peter Maydell
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