[PATCH 1/7] KVM: api: add kvm_irq_routing_extended_msi
From: Eric Auger <hidden>
Date: 2015-06-29 15:38:04
Also in:
kvm, kvmarm, lkml
Subsystem:
documentation, kernel virtual machine (kvm), the rest · Maintainers:
Jonathan Corbet, Paolo Bonzini, Linus Torvalds
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 <redacted> --- 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