1 files changed, 84 insertions, 0 deletions
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
new file mode 100644
index 000000000..1d83152c7
--- /dev/null
+++ b/arch/x86/xen/suspend.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <linux/tick.h>
+#include <linux/percpu-defs.h>
+
+#include <xen/xen.h>
+#include <xen/interface/xen.h>
+#include <xen/grant_table.h>
+#include <xen/events.h>
+
+#include <asm/cpufeatures.h>
+#include <asm/msr-index.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/page.h>
+#include <asm/fixmap.h>
+
+#include "xen-ops.h"
+#include "mmu.h"
+#include "pmu.h"
+
+static DEFINE_PER_CPU(u64, spec_ctrl);
+
+void xen_arch_pre_suspend(void)
+{
+	xen_save_time_memory_area();
+
+	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);
+
+	xen_restore_time_memory_area();
+}
+
+static void xen_vcpu_notify_restore(void *data)
+{
+	if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL))
+		wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl));
+
+	/* Boot processor notified via generic timekeeping_resume() */
+	if (smp_processor_id() == 0)
+		return;
+
+	tick_resume_local();
+}
+
+static void xen_vcpu_notify_suspend(void *data)
+{
+	u64 tmp;
+
+	tick_suspend_local();
+
+	if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) {
+		rdmsrl(MSR_IA32_SPEC_CTRL, tmp);
+		this_cpu_write(spec_ctrl, tmp);
+		wrmsrl(MSR_IA32_SPEC_CTRL, 0);
+	}
+}
+
+void xen_arch_resume(void)
+{
+	int cpu;
+
+	on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
+
+	for_each_online_cpu(cpu)
+		xen_pmu_init(cpu);
+}
+
+void xen_arch_suspend(void)
+{
+	int cpu;
+
+	for_each_online_cpu(cpu)
+		xen_pmu_finish(cpu);
+
+	on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
+}