[Qemu-devel] [PATCH v11 28/28] intel_iommu: disallow kernel-irqchip=on with IR

[Peter Xu <peterx@redhat.com>]

When user specify "kernel-irqchip=on", throw error and then quit.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/i386/intel_iommu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 8a91e64..76471ad 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -20,6 +20,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/error-report.h"
 #include "hw/sysbus.h"
 #include "exec/address-spaces.h"
 #include "intel_iommu_internal.h"
@@ -29,6 +30,7 @@
 #include "hw/boards.h"
 #include "hw/i386/x86-iommu.h"
 #include "hw/pci-host/q35.h"
+#include "sysemu/kvm.h"
 
 /*#define DEBUG_INTEL_IOMMU*/
 #ifdef DEBUG_INTEL_IOMMU
@@ -2476,6 +2478,13 @@ 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 (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)
-- 
2.4.11