[Xen-devel] [PATCH 3/6] Allow suspend/resume for driver domain

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

Add suspend/resume support for driver domain. Note, driver
domain will only work correctly for light-weight suspend
and resume, where domain itself is just suspended with all
context reserved. Machine addresses saved in private driver
structures make it impossible for save/restore and migration,
unless para-domU itself supports and uses IOMMU as the 
default DMA interface.


Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>

diff -r 7c8c027475f5 -r ac24ecea9595
linux-2.6-xen-sparse/arch/i386/kernel/time-xen.c
--- a/linux-2.6-xen-sparse/arch/i386/kernel/time-xen.c  Mon Feb 05
16:58:10 2007 +0800
+++ b/linux-2.6-xen-sparse/arch/i386/kernel/time-xen.c  Mon Feb 05
17:30:13 2007 +0800
@@ -852,8 +852,6 @@ static int timer_resume(struct sys_devic
 }
 
 static struct sysdev_class timer_sysclass = {
-       .resume = timer_resume,
-       .suspend = timer_suspend,
        set_kset_name("timer"),
 };
 
diff -r 7c8c027475f5 -r ac24ecea9595
linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c    Mon Feb
05 16:58:10 2007 +0800
+++ b/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c    Mon Feb
05 17:30:13 2007 +0800
@@ -151,6 +151,14 @@ int __xen_suspend(void)
        if (err)
                return err;
 
+       if (freeze_processes()) {
+               err = -EAGAIN;
+               goto Thaw;
+       }
+
+       if ((err = device_suspend(PMSG_SUSPEND)))
+               goto Thaw;
+
        xenbus_suspend();
 
        preempt_disable();
@@ -158,6 +166,9 @@ int __xen_suspend(void)
        mm_pin_all();
        local_irq_disable();
        preempt_enable();
+
+       if ((err = device_power_down(PMSG_SUSPEND)))
+               goto Thaw;
 
        gnttab_suspend();
 
@@ -176,6 +187,8 @@ int __xen_suspend(void)
        if (!suspend_cancelled)
                irq_resume();
 
+       device_power_up();
+
        time_resume();
 
        switch_idle_mm();
@@ -189,6 +202,10 @@ int __xen_suspend(void)
                xenbus_suspend_cancel();
        }
 
+       device_resume();
+       err = 0;
+Thaw:
+       thaw_processes();
        smp_resume();
 
        return err;

Attachment: driver_domain_suspend.patch
Description: driver_domain_suspend.patch

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