On ARM, the MSI msg (address and data) comes along with
out-of-band device ID information. The device ID encodes the device
that composes the MSI msg. Let's create a new routing entry type,
dubbed KVM_IRQ_ROUTING_EXTENDED_MSI and use the __u32 pad space
to convey the device ID.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
RFC -> PATCH
- remove kvm_irq_routing_extended_msi and use union instead
---
Documentation/virtual/kvm/api.txt | 9 ++++++++-
include/uapi/linux/kvm.h | 6 +++++-
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index d20fd94..6426ae9 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1414,7 +1414,10 @@ struct kvm_irq_routing_entry {
__u32 gsi;
__u32 type;
__u32 flags;
- __u32 pad;
+ union {
+ __u32 pad;
+ __u32 devid;
+ };
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
@@ -1427,6 +1430,10 @@ struct kvm_irq_routing_entry {
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
#define KVM_IRQ_ROUTING_S390_ADAPTER 3
+#define KVM_IRQ_ROUTING_EXTENDED_MSI 4
+
+In case of KVM_IRQ_ROUTING_EXTENDED_MSI routing type, devid is used to convey
+the device ID.
No flags are specified so far, the corresponding field must be set to zero.
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2a23705..8484681 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -841,12 +841,16 @@ struct kvm_irq_routing_s390_adapter {
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
#define KVM_IRQ_ROUTING_S390_ADAPTER 3
+#define KVM_IRQ_ROUTING_EXTENDED_MSI 4
struct kvm_irq_routing_entry {
__u32 gsi;
__u32 type;
__u32 flags;
- __u32 pad;
+ union {
+ __u32 pad;
+ __u32 devid;
+ };
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
--
1.9.1
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