linux-kernel - [PATCH 1/7] KVM: api: add kvm_irq_routing_extended

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Date:	Mon, 29 Jun 2015 17:37:11 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
	christoffer.dall@...aro.org, andre.przywara@....com,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, patches@...aro.org,
	p.fedin@...sung.com, pbonzini@...hat.com
Subject: [PATCH 1/7] KVM: api: add kvm_irq_routing_extended_msi

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@...aro.org>

---

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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