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authorJoao Martins <joao.m.martins@oracle.com>2017-11-08 17:19:57 +0000
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2017-11-08 16:33:14 -0500
commit2229f70b5bbb025e1394b61007938a68060afbfb (patch)
tree9020b4a527c21dd34cd5f38672a790b88811f585 /arch/x86/xen/suspend.c
parentb888808093113ae7d63d213272d01fea4b8329ed (diff)
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/suspend.c')
-rw-r--r--arch/x86/xen/suspend.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index d6b1680693a9..800ed36ecfba 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -16,6 +16,8 @@
void xen_arch_pre_suspend(void)
{
+ xen_save_time_memory_area();
+
if (xen_pv_domain())
xen_pv_pre_suspend();
}
@@ -26,6 +28,8 @@ void xen_arch_post_suspend(int cancelled)
xen_pv_post_suspend(cancelled);
else
xen_hvm_post_suspend(cancelled);
+
+ xen_restore_time_memory_area();
}
static void xen_vcpu_notify_restore(void *data)