From: Eric Auger eric.auger@linaro.org
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 a new routing entry type to indicate the devid is populated.
Signed-off-by: Eric Auger eric.auger@linaro.org
---
v1 -> v2: - devid id passed in kvm_irq_routing_msi instead of in kvm_irq_routing_entry
RFC -> PATCH - remove kvm_irq_routing_extended_msi and use union instead
Signed-off-by: Vadim Lomovtsev Vadim.Lomovtsev@caviumnetworks.com --- Documentation/virtual/kvm/api.txt | 10 +++++++++- include/uapi/linux/kvm.h | 6 +++++- 2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 1b53155..3094139 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1453,6 +1453,7 @@ 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
No flags are specified so far, the corresponding field must be set to zero.
@@ -1465,9 +1466,16 @@ struct kvm_irq_routing_msi { __u32 address_lo; __u32 address_hi; __u32 data; - __u32 pad; + union { + __u32 pad; + __u32 devid; + }; };
+for KVM_IRQ_ROUTING_EXTENDED_MSI routing entry type, the kvm_irq_routing_msi +routing entry is used and devid is populated with the device ID that wrote +the MSI message. For PCI, this is usually a BFD identifier in the lower 16 bits. + struct kvm_irq_routing_s390_adapter { __u64 ind_addr; __u64 summary_addr; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 1c48def..817586f 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -830,7 +830,10 @@ 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 { @@ -845,6 +848,7 @@ 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;