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authorAndrew Jones <drjones@redhat.com>2020-10-01 08:17:18 +0200
committerPeter Maydell <peter.maydell@linaro.org>2020-10-08 15:24:32 +0100
commit68970d1e0d07e3a266141bbd9038fd9890ca88f2 (patch)
treed63c836446b8badc5006aa9ce76ca90cb2ef16c5 /docs/system/arm/cpu-features.rst
parent05889d15d1c95163de917800cf0e1bf6faab1bc7 (diff)
hw/arm/virt: Implement kvm-steal-time
We add the kvm-steal-time CPU property and implement it for machvirt. A tiny bit of refactoring was also done to allow pmu and pvtime to use the same vcpu device helper functions. Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Andrew Jones <drjones@redhat.com> Message-id: 20201001061718.101915-7-drjones@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/system/arm/cpu-features.rst')
-rw-r--r--docs/system/arm/cpu-features.rst11
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/system/arm/cpu-features.rst b/docs/system/arm/cpu-features.rst
index 2d5c06cd01..35196a6b75 100644
--- a/docs/system/arm/cpu-features.rst
+++ b/docs/system/arm/cpu-features.rst
@@ -200,6 +200,17 @@ the list of KVM VCPU features and their descriptions.
adjustment, also restoring the legacy (pre-5.0)
behavior.
+ kvm-steal-time Since v5.2, kvm-steal-time is enabled by
+ default when KVM is enabled, the feature is
+ supported, and the guest is 64-bit.
+
+ When kvm-steal-time is enabled a 64-bit guest
+ can account for time its CPUs were not running
+ due to the host not scheduling the corresponding
+ VCPU threads. The accounting statistics may
+ influence the guest scheduler behavior and/or be
+ exposed to the guest userspace.
+
SVE CPU Properties
==================