| Message ID | 20201001061718.101915-1-drjones@redhat.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | hw/arm/virt: Introduce kvm-steal-time | expand |
On Thu, 1 Oct 2020 at 07:17, Andrew Jones <drjones@redhat.com> wrote: > > 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 Applied to target-arm.next, thanks. -- PMM
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(-)