KVM: api: Pass the devid in the msi routing entry

On ARM, the MSI msg (address and data) comes along with
out-of-band device ID information. The device ID encodes the
device that writes the MSI msg. Let's convey the device id in
kvm_irq_routing_msi and use KVM_MSI_VALID_DEVID flag value in
kvm_irq_routing_entry to indicate the msi devid is populated.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index d8c4c324cfae..eb2220895c6e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -879,7 +879,10 @@ struct kvm_irq_routing_msi {
         __u32 address_lo;
         __u32 address_hi;
         __u32 data;
-        __u32 pad;
+        union {
+                __u32 pad;
+                __u32 devid;
+        };
 };
 
 struct kvm_irq_routing_s390_adapter {