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| author | Joao Martins <joao.m.martins@oracle.com> | 2017-11-08 17:19:57 +0000 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-11-08 16:33:14 -0500 |
| commit | 2229f70b5bbb025e1394b61007938a68060afbfb (patch) | |
| tree | 9020b4a527c21dd34cd5f38672a790b88811f585 /arch/x86/xen/xen-ops.h | |
| parent | b888808093113ae7d63d213272d01fea4b8329ed (diff) | |
| download | linux-2229f70b5bbb025e1394b61007938a68060afbfb.tar.bz2 | |
x86/xen/time: setup vcpu 0 time info page
In order to support pvclock vdso on xen we need to setup the time
info page for vcpu 0 and register the page with Xen using the
VCPUOP_register_vcpu_time_memory_area hypercall. This hypercall
will also forcefully update the pvti which will set some of the
necessary flags for vdso. Afterwards we check if it supports the
PVCLOCK_TSC_STABLE_BIT flag which is mandatory for having
vdso/vsyscall support. And if so, it will set the cpu 0 pvti that
will be later on used when mapping the vdso image.
The xen headers are also updated to include the new hypercall for
registering the secondary vcpu_time_info struct.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch/x86/xen/xen-ops.h')
| -rw-r--r-- | arch/x86/xen/xen-ops.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index c8a6d224f7ed..f96dbedb33d4 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -69,6 +69,8 @@ void xen_setup_runstate_info(int cpu); void xen_teardown_timer(int cpu); u64 xen_clocksource_read(void); void xen_setup_cpu_clockevents(void); +void xen_save_time_memory_area(void); +void xen_restore_time_memory_area(void); void __init xen_init_time_ops(void); void __init xen_hvm_init_time_ops(void); |