Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/kernel/arch/x86/xen/suspend.c b/kernel/arch/x86/xen/suspend.c
new file mode 100644
index 000000000..53b4c0811
--- /dev/null
+++ b/kernel/arch/x86/xen/suspend.c
@@ -0,0 +1,104 @@
+#include <linux/types.h>
+#include <linux/tick.h>
+
+#include <xen/interface/xen.h>
+#include <xen/grant_table.h>
+#include <xen/events.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/page.h>
+#include <asm/fixmap.h>
+
+#include "xen-ops.h"
+#include "mmu.h"
+
+static void xen_pv_pre_suspend(void)
+{
+	xen_mm_pin_all();
+
+	xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
+	xen_start_info->console.domU.mfn =
+		mfn_to_pfn(xen_start_info->console.domU.mfn);
+
+	BUG_ON(!irqs_disabled());
+
+	HYPERVISOR_shared_info = &xen_dummy_shared_info;
+	if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
+					 __pte_ma(0), 0))
+		BUG();
+}
+
+static void xen_hvm_post_suspend(int suspend_cancelled)
+{
+#ifdef CONFIG_XEN_PVHVM
+	int cpu;
+	xen_hvm_init_shared_info();
+	xen_callback_vector();
+	xen_unplug_emulated_devices();
+	if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
+		for_each_online_cpu(cpu) {
+			xen_setup_runstate_info(cpu);
+		}
+	}
+#endif
+}
+
+static void xen_pv_post_suspend(int suspend_cancelled)
+{
+	xen_build_mfn_list_list();
+
+	xen_setup_shared_info();
+
+	if (suspend_cancelled) {
+		xen_start_info->store_mfn =
+			pfn_to_mfn(xen_start_info->store_mfn);
+		xen_start_info->console.domU.mfn =
+			pfn_to_mfn(xen_start_info->console.domU.mfn);
+	} else {
+#ifdef CONFIG_SMP
+		BUG_ON(xen_cpu_initialized_map == NULL);
+		cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
+#endif
+		xen_vcpu_restore();
+	}
+
+	xen_mm_unpin_all();
+}
+
+void xen_arch_pre_suspend(void)
+{
+    if (xen_pv_domain())
+        xen_pv_pre_suspend();
+}
+
+void xen_arch_post_suspend(int cancelled)
+{
+    if (xen_pv_domain())
+        xen_pv_post_suspend(cancelled);
+    else
+        xen_hvm_post_suspend(cancelled);
+}
+
+static void xen_vcpu_notify_restore(void *data)
+{
+	/* Boot processor notified via generic timekeeping_resume() */
+	if (smp_processor_id() == 0)
+		return;
+
+	tick_resume_local();
+}
+
+static void xen_vcpu_notify_suspend(void *data)
+{
+	tick_suspend_local();
+}
+
+void xen_arch_resume(void)
+{
+	on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
+}
+
+void xen_arch_suspend(void)
+{
+	on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
+}