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authorSteven Price <steven.price@arm.com>2019-10-21 18:28:23 +0300
committerMarc Zyngier <maz@kernel.org>2019-10-21 21:20:31 +0300
commite0685fa228fdaf386f82ac0d64b2d6f3e0ddd588 (patch)
tree82a0c4c7b00b1ba16518c7be5dbf58640e154f28 /include/linux/cpuhotplug.h
parentce4d5ca2b9dd5d85944eb93c1bbf9eb11b7a907d (diff)
downloadlinux-e0685fa228fdaf386f82ac0d64b2d6f3e0ddd588.tar.xz
arm64: Retrieve stolen time as paravirtualized guest
Enable paravirtualization features when running under a hypervisor supporting the PV_TIME_ST hypercall. For each (v)CPU, we ask the hypervisor for the location of a shared page which the hypervisor will use to report stolen time to us. We set pv_time_ops to the stolen time function which simply reads the stolen value from the shared page for a VCPU. We guarantee single-copy atomicity using READ_ONCE which means we can also read the stolen time for another VCPU than the currently running one while it is potentially being updated by the hypervisor. Signed-off-by: Steven Price <steven.price@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'include/linux/cpuhotplug.h')
-rw-r--r--include/linux/cpuhotplug.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 068793a619ca..89d75edb5750 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -136,6 +136,7 @@ enum cpuhp_state {
/* Must be the last timer callback */
CPUHP_AP_DUMMY_TIMER_STARTING,
CPUHP_AP_ARM_XEN_STARTING,
+ CPUHP_AP_ARM_KVMPV_STARTING,
CPUHP_AP_ARM_CORESIGHT_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_SMPCFD_DYING,