x86: freeze non-current vCPU-s of dom0 before entering S5

PATCH New Jan Beulich 1 participant 1 message Nov 20, 2008

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Jan Beulich

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2008-11-20 13:42 UTC #0 lore raw

PATCH 1/1 x86: freeze non-current vCPU-s of dom0 before entering S5

Also excluding the idle domain from the domains being frozen.

This seems to be particularly important for 3.2 and 3.3, -unstable should be fine since the non-idle-vCPU-s are being migrated away from the pCPU-s being torn down.

Signed-off-by Jan Beulich <[email protected]>

xen/arch/x86/acpi/power.c +34 -2

Index: 2008-11-20/xen/arch/x86/acpi/power.c
===================================================================
@@ -77,19 +77,51 @@ static void device_power_up(void)
 static void freeze_domains(void)
 {
     struct domain *d;
+    struct vcpu *v;
 
+    rcu_read_lock(&domlist_read_lock);
     for_each_domain ( d )
-        if ( d->domain_id != 0 )
+    {
+        switch ( d->domain_id )
+        {
+        default:
             domain_pause(d);
+            break;
+        case 0:
+            for_each_vcpu ( d, v )
+                if ( v != current )
+                    vcpu_pause(v);
+            break;
+        case IDLE_DOMAIN_ID:
+            break;
+        }
+    }
+    rcu_read_unlock(&domlist_read_lock);
 }
 
 static void thaw_domains(void)
 {
     struct domain *d;
+    struct vcpu *v;
 
+    rcu_read_lock(&domlist_read_lock);
     for_each_domain ( d )
-        if ( d->domain_id != 0 )
+    {
+        switch ( d->domain_id )
+        {
+        default:
             domain_unpause(d);
+            break;
+        case 0:
+            for_each_vcpu ( d, v )
+                if ( v != current )
+                    vcpu_unpause(v);
+            break;
+        case IDLE_DOMAIN_ID:
+            break;
+        }
+    }
+    rcu_read_unlock(&domlist_read_lock);
 }
 
 static void acpi_sleep_prepare(u32 state)