[PATCH] KVM: Host suspend/resume support

Add the necessary callbacks to suspend and resume a host running kvm.  This is
just a repeat of the cpu hotplug/unplug work.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 40 insertions, 1 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 291d298868fc..af866147ff25 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -34,6 +34,7 @@
 #include <linux/highmem.h>
 #include <linux/file.h>
 #include <asm/desc.h>
+#include <linux/sysdev.h>
 #include <linux/cpu.h>
 
 #include "x86_emulate.h"
@@ -2117,6 +2118,30 @@ static void kvm_exit_debug(void)
         debugfs_remove(debugfs_dir);
 }
 
+static int kvm_suspend(struct sys_device *dev, pm_message_t state)
+{
+        decache_vcpus_on_cpu(raw_smp_processor_id());
+        on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
+        return 0;
+}
+
+static int kvm_resume(struct sys_device *dev)
+{
+        on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
+        return 0;
+}
+
+static struct sysdev_class kvm_sysdev_class = {
+        set_kset_name("kvm"),
+        .suspend = kvm_suspend,
+        .resume = kvm_resume,
+};
+
+static struct sys_device kvm_sysdev = {
+        .id = 0,
+        .cls = &kvm_sysdev_class,
+};
+
 hpa_t bad_page_address;
 
 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
@@ -2149,6 +2174,14 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
                 goto out_free_1;
         register_reboot_notifier(&kvm_reboot_notifier);
 
+        r = sysdev_class_register(&kvm_sysdev_class);
+        if (r)
+                goto out_free_2;
+
+        r = sysdev_register(&kvm_sysdev);
+        if (r)
+                goto out_free_3;
+
         kvm_chardev_ops.owner = module;
 
         r = misc_register(&kvm_dev);
@@ -2160,6 +2193,10 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
         return r;
 
 out_free:
+        sysdev_unregister(&kvm_sysdev);
+out_free_3:
+        sysdev_class_unregister(&kvm_sysdev_class);
+out_free_2:
         unregister_reboot_notifier(&kvm_reboot_notifier);
         unregister_cpu_notifier(&kvm_cpu_notifier);
 out_free_1:
@@ -2171,8 +2208,10 @@ out_free_1:
 void kvm_exit_arch(void)
 {
         misc_deregister(&kvm_dev);
-
+        sysdev_unregister(&kvm_sysdev);
+        sysdev_class_unregister(&kvm_sysdev_class);
         unregister_reboot_notifier(&kvm_reboot_notifier);
+        unregister_cpu_notifier(&kvm_cpu_notifier);
         on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
         kvm_arch_ops->hardware_unsetup();
         kvm_arch_ops = NULL;