[Qemu-devel] [PATCH v2 4/7] intel-iommu: exit on invalid configuraton earlier

["Radim Krčmář" <rkrcmar@redhat.com>]

No point in configuring the device if realization is going to fail.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
 hw/i386/intel_iommu.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index c39b62b898d8..eb488c14625d 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2457,6 +2457,15 @@ static void vtd_realize(DeviceState *dev, Error **errp)
 
     VTD_DPRINTF(GENERAL, "");
     x86_iommu->type = TYPE_INTEL;
+
+    /* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
+    if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
+        !kvm_irqchip_is_split()) {
+        error_report("Intel Interrupt Remapping cannot work with "
+                     "kernel-irqchip=on, please use 'split|off'.");
+        exit(1);
+    }
+
     memset(s->vtd_as_by_bus_num, 0, sizeof(s->vtd_as_by_bus_num));
     memory_region_init_io(&s->csrmem, OBJECT(s), &vtd_mem_ops, s,
                           "intel_iommu", DMAR_REG_SIZE);
@@ -2471,14 +2480,6 @@ static void vtd_realize(DeviceState *dev, Error **errp)
     pci_setup_iommu(bus, vtd_host_dma_iommu, dev);
     /* Pseudo address space under root PCI bus. */
     pcms->ioapic_as = vtd_host_dma_iommu(bus, s, Q35_PSEUDO_DEVFN_IOAPIC);
-
-    /* Currently Intel IOMMU IR only support "kernel-irqchip={off|split}" */
-    if (x86_iommu->intr_supported && kvm_irqchip_in_kernel() &&
-        !kvm_irqchip_is_split()) {
-        error_report("Intel Interrupt Remapping cannot work with "
-                     "kernel-irqchip=on, please use 'split|off'.");
-        exit(1);
-    }
 }
 
 static void vtd_class_init(ObjectClass *klass, void *data)
-- 
2.10.0