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| author | Steven Price <steven.price@arm.com> | 2019-10-21 16:28:23 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2019-10-21 19:20:31 +0100 |
| commit | e0685fa228fdaf386f82ac0d64b2d6f3e0ddd588 (patch) | |
| tree | 82a0c4c7b00b1ba16518c7be5dbf58640e154f28 /virt/kvm | |
| parent | ce4d5ca2b9dd5d85944eb93c1bbf9eb11b7a907d (diff) | |
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 'virt/kvm')
0 files changed, 0 insertions, 0 deletions