Re: [PATCH 0/3] hw/arm/virt: Introduce kvm-steal-time

[Andrew Jones]

On Mon, Jul 20, 2020 at 11:16:41AM +0100, Peter Maydell wrote:
> 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.
>

Yup. No problem. I was out on vacation all last week, so there wasn't
a chance for me to follow up until now anyway. Thanks for the review.
I'll get to the responses / respinning tomorrow after I dig out of my
email backlog.

drew