kernel/git/stable/linux.git/drivers/xen/time.c, branch linux-4.10.y

xen: add static initialization of steal_clock op to xen_time_ops

2016-07-26T13:07:06+00:00

pv_time_ops might be overwritten with xen_time_ops after the steal_clock operation has been initialized already. To prevent calling a now uninitialized function pointer add the steal_clock static initialization to xen_time_ops. Signed-off-by: Juergen Gross Signed-off-by: David Vrabel

x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op

2016-07-25T12:32:34+00:00

HYPERVISOR_vcpu_op() passes Linux's idea of vCPU id as a parameter while Xen's idea is expected. In some cases these ideas diverge so we need to do remapping. Convert all callers of HYPERVISOR_vcpu_op() to use xen_vcpu_nr(). Leave xen_fill_possible_map() and xen_filter_cpu_maps() intact as they're only being called by PV guests before perpu areas are initialized. While the issue could be solved by switching to early_percpu for xen_vcpu_id I think it's not worth it: PV guests will probably never get to the point where their idea of vCPU id diverges from Xen's. Signed-off-by: Vitaly Kuznetsov Signed-off-by: David Vrabel

xen: support runqueue steal time on xen

2016-07-06T09:42:19+00:00

Up to now reading the stolen time of a remote cpu was not possible in a performant way under Xen. This made support of runqueue steal time via paravirt_steal_rq_enabled impossible. With the addition of an appropriate hypervisor interface this is now possible, so add the support. Signed-off-by: Juergen Gross Reviewed-by: Stefano Stabellini Signed-off-by: David Vrabel

xen: add steal_clock support on x86

2016-07-06T09:34:48+00:00

The pv_time_ops structure contains a function pointer for the "steal_clock" functionality used only by KVM and Xen on ARM. Xen on x86 uses its own mechanism to account for the "stolen" time a thread wasn't able to run due to hypervisor scheduling. Add support in Xen arch independent time handling for this feature by moving it out of the arm arch into drivers/xen and remove the x86 Xen hack. Signed-off-by: Juergen Gross Reviewed-by: Boris Ostrovsky Reviewed-by: Stefano Stabellini Signed-off-by: David Vrabel

xen/time: use READ_ONCE

2015-12-21T14:41:00+00:00

Use READ_ONCE through the code, rather than explicit barriers. Suggested-by: Mark Rutland Signed-off-by: Stefano Stabellini Signed-off-by: David Vrabel

xen: move xen_setup_runstate_info and get_runstate_snapshot to drivers/xen/time.c

2015-12-21T14:40:52+00:00

Signed-off-by: Stefano Stabellini Acked-by: Ian Campbell Reviewed-by: Konrad Rzeszutek Wilk