diff mbox series

[v2,07/10] AMD/IOMMU: allow enabling with IRQ not yet set up

Message ID 5D14DF23020000780023B98D@prv1-mh.provo.novell.com (mailing list archive)
State New, archived
Headers show
Series x86: AMD x2APIC support | expand

Commit Message

Jan Beulich June 27, 2019, 3:22 p.m. UTC 
Early enabling (to enter x2APIC mode) requires deferring of the IRQ
setup. Code to actually do that setup in the x2APIC case will get added
subsequently.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
diff mbox series

Patch

--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -814,7 +814,6 @@  static void amd_iommu_erratum_746_workar
 static void enable_iommu(struct amd_iommu *iommu)
 {
     unsigned long flags;
-    struct irq_desc *desc;
 
     spin_lock_irqsave(&iommu->lock, flags);
 
@@ -834,19 +833,27 @@  static void enable_iommu(struct amd_iomm
     if ( iommu->features.flds.ppr_sup )
         register_iommu_ppr_log_in_mmio_space(iommu);
 
-    desc = irq_to_desc(iommu->msi.irq);
-    spin_lock(&desc->lock);
-    set_msi_affinity(desc, &cpu_online_map);
-    spin_unlock(&desc->lock);
+    if ( iommu->msi.irq > 0 )
+    {
+        struct irq_desc *desc = irq_to_desc(iommu->msi.irq);
+
+        spin_lock(&desc->lock);
+        set_msi_affinity(desc, &cpu_online_map);
+        spin_unlock(&desc->lock);
+    }
 
     amd_iommu_msi_enable(iommu, IOMMU_CONTROL_ENABLED);
 
     set_iommu_ht_flags(iommu);
     set_iommu_command_buffer_control(iommu, IOMMU_CONTROL_ENABLED);
-    set_iommu_event_log_control(iommu, IOMMU_CONTROL_ENABLED);
 
-    if ( iommu->features.flds.ppr_sup )
-        set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_ENABLED);
+    if ( iommu->msi.irq > 0 )
+    {
+        set_iommu_event_log_control(iommu, IOMMU_CONTROL_ENABLED);
+
+        if ( iommu->features.flds.ppr_sup )
+            set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_ENABLED);
+    }
 
     if ( iommu->features.flds.gt_sup )
         set_iommu_guest_translation_control(iommu, IOMMU_CONTROL_ENABLED);