[Qemu-devel] [PATCH v7 4/8] kvm-all: Pass requester ID to MSI routing functions

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

From: Pavel Fedin <p.fedin@samsung.com>

Introduce global kvm_msi_use_devid flag plus associated
kvm_msi_devid_required() macro. Passes the device ID,
if needed, while building the MSI route entry. Device IDs are
required by the ARM GICv3 ITS (IRQ remapping function is based on
this information).

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v6 -> v7:
- add/use kvm_msi_devid_required() macro

v5 -> v6:
- move the flag in include/sysemu/kvm.h and populate the devid
  information in kvm-all.c

v3 -> v4:
- OR route->flags with KVM_MSI_VALID_DEVID
---
 include/sysemu/kvm.h | 9 +++++++++
 kvm-all.c            | 9 +++++++++
 kvm-stub.c           | 1 +
 3 files changed, 19 insertions(+)

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 3e17ba7..df67cc0 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -53,6 +53,7 @@ extern bool kvm_gsi_direct_mapping;
 extern bool kvm_readonly_mem_allowed;
 extern bool kvm_direct_msi_allowed;
 extern bool kvm_ioeventfd_any_length_allowed;
+extern bool kvm_msi_use_devid;
 
 #if defined CONFIG_KVM || !defined NEED_CPU_H
 #define kvm_enabled()           (kvm_allowed)
@@ -169,6 +170,13 @@ extern bool kvm_ioeventfd_any_length_allowed;
  */
 #define kvm_ioeventfd_any_length_enabled() (kvm_ioeventfd_any_length_allowed)
 
+/**
+ * kvm_msi_devid_required:
+ * Returns: true if KVM requires a device id to be provided while
+ * defining an MSI routing entry.
+ */
+#define kvm_msi_devid_required() (kvm_msi_use_devid)
+
 #else
 #define kvm_enabled()           (0)
 #define kvm_irqchip_in_kernel() (false)
@@ -184,6 +192,7 @@ extern bool kvm_ioeventfd_any_length_allowed;
 #define kvm_readonly_mem_enabled() (false)
 #define kvm_direct_msi_enabled() (false)
 #define kvm_ioeventfd_any_length_enabled() (false)
+#define kvm_msi_devid_required() (false)
 #endif
 
 struct kvm_run;
diff --git a/kvm-all.c b/kvm-all.c
index 8a4382e..25e12c2 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -119,6 +119,7 @@ bool kvm_readonly_mem_allowed;
 bool kvm_vm_attributes_allowed;
 bool kvm_direct_msi_allowed;
 bool kvm_ioeventfd_any_length_allowed;
+bool kvm_msi_use_devid;
 
 static const KVMCapabilityInfo kvm_required_capabilites[] = {
     KVM_CAP_INFO(USER_MEMORY),
@@ -1275,6 +1276,10 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
     kroute.u.msi.address_lo = (uint32_t)msg.address;
     kroute.u.msi.address_hi = msg.address >> 32;
     kroute.u.msi.data = le32_to_cpu(msg.data);
+    if (kvm_msi_devid_required()) {
+        kroute.flags = KVM_MSI_VALID_DEVID;
+        kroute.u.msi.devid = pci_requester_id(dev);
+    }
     if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
         kvm_irqchip_release_virq(s, virq);
         return -EINVAL;
@@ -1308,6 +1313,10 @@ int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
     kroute.u.msi.address_lo = (uint32_t)msg.address;
     kroute.u.msi.address_hi = msg.address >> 32;
     kroute.u.msi.data = le32_to_cpu(msg.data);
+    if (kvm_msi_devid_required()) {
+        kroute.flags = KVM_MSI_VALID_DEVID;
+        kroute.u.msi.devid = pci_requester_id(dev);
+    }
     if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
         return -EINVAL;
     }
diff --git a/kvm-stub.c b/kvm-stub.c
index 3227127..b1b6b96 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -31,6 +31,7 @@ bool kvm_gsi_direct_mapping;
 bool kvm_allowed;
 bool kvm_readonly_mem_allowed;
 bool kvm_ioeventfd_any_length_allowed;
+bool kvm_msi_use_devid;
 
 int kvm_destroy_vcpu(CPUState *cpu)
 {
-- 
2.5.5