On Tue, Sep 29, 2020 at 04:47:33PM +0200, Andrew Jones wrote:
>
> Hi Peter, Eric, and other interested parties,
>
> Here's a gentle ping for reviewers.
Thanks for the review Eric! I'll send a Linux header update patch and a
rebase of this series with R-b's.
drew
>
> 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
> >
>
>