[Qemu-arm] [RFC PATCH 1/2] target/arm/kvm: Translate the MSI doorbell in kvm_arch_fixup_msi_route

[Bharat Bhushan]

Fix-up MSI address if it translate via virtual iommu.
This code is based on http://patchwork.ozlabs.org/patch/785951/

Signed-off-by: Bharat Bhushan <address@hidden>
---
 target/arm/kvm.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 4555468..eff7e8f 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -22,6 +22,9 @@
 #include "cpu.h"
 #include "internals.h"
 #include "hw/arm/arm.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/msi.h"
+#include "hw/virtio/virtio-iommu.h"
 #include "exec/memattrs.h"
 #include "exec/address-spaces.h"
 #include "hw/boards.h"
@@ -611,6 +614,24 @@ int kvm_arm_vgic_probe(void)
 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
                              uint64_t address, uint32_t data, PCIDevice *dev)
 {
+    AddressSpace *as = pci_device_iommu_address_space(dev);
+    IOMMUTLBEntry entry;
+    IOMMUDevice *sdev;
+    VirtIOIOMMU *s;
+
+    if (as == &address_space_memory) {
+        return 0;
+    }
+
+    /* MSI doorbell address is translated by an IOMMU */
+    sdev = container_of(as, IOMMUDevice, as);
+    s = sdev->viommu;
+
+    entry = s->iommu_ops.translate(&sdev->iommu_mr, address, IOMMU_WO);
+
+    route->u.msi.address_lo = entry.translated_addr;
+    route->u.msi.address_hi = entry.translated_addr >> 32;
+
     return 0;
 }
 
-- 
1.9.3