[Qemu-devel] [RFC v5 7/8] target/arm/kvm: Translate the MSI doorbell in kvm_arch_fixup_msi_route

[Eric Auger <eric.auger@redhat.com>]

In case the MSI is translated by an IOMMU we need to fixup the
MSI route with the translated address.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---

It is still unclear to me if we need to register an IOMMUNotifier
to handle any change in the MSI doorbell which would occur behind
the scene and would not lead to any call to kvm_arch_fixup_msi_route().
---
 target/arm/kvm.c        | 28 ++++++++++++++++++++++++++++
 target/arm/trace-events |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 4555468..630754f 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -20,8 +20,13 @@
 #include "sysemu/kvm.h"
 #include "kvm_arm.h"
 #include "cpu.h"
+#include "trace.h"
 #include "internals.h"
 #include "hw/arm/arm.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/msi.h"
+#include "hw/arm/smmu-common.h"
+#include "hw/arm/smmuv3.h"
 #include "exec/memattrs.h"
 #include "exec/address-spaces.h"
 #include "hw/boards.h"
@@ -611,6 +616,29 @@ 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;
+    SMMUDevice *sdev;
+    SMMUV3State *s3;
+    SMMUState *s;
+
+    if (as == &address_space_memory) {
+        return 0;
+    }
+
+    /* MSI doorbell address is translated by an IOMMU */
+    sdev = container_of(as, SMMUDevice, as);
+    s3 = sdev->smmu;
+    s = &s3->smmu_state;
+
+    entry = s->iommu_ops.translate(&sdev->iommu, address, IOMMU_WO);
+
+    route->u.msi.address_lo = entry.translated_addr;
+    route->u.msi.address_hi = entry.translated_addr >> 32;
+
+    trace_kvm_arm_fixup_msi_route(address, sdev->devfn, sdev->iommu.name,
+                                  entry.translated_addr);
+
     return 0;
 }
 
diff --git a/target/arm/trace-events b/target/arm/trace-events
index e21c84f..eff2822 100644
--- a/target/arm/trace-events
+++ b/target/arm/trace-events
@@ -8,3 +8,6 @@ arm_gt_tval_write(int timer, uint64_t value) "gt_tval_write: timer %d value %" P
 arm_gt_ctl_write(int timer, uint64_t value) "gt_ctl_write: timer %d value %" PRIx64
 arm_gt_imask_toggle(int timer, int irqstate) "gt_ctl_write: timer %d IMASK toggle, new irqstate %d"
 arm_gt_cntvoff_write(uint64_t value) "gt_cntvoff_write: value %" PRIx64
+
+# target/arm/kvm.c
+kvm_arm_fixup_msi_route(uint64_t iova, uint32_t devid, const char *name, uint64_t gpa) "MSI addr = 0x%"PRIx64" is translated for devfn=%d through %s into 0x%"PRIx64
-- 
2.5.5