On 09/07/15 09:22, Eric Auger wrote:
> 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@xxxxxxxxxx>
Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>
Just some forward looking statement: If this gets based on top of my ITS
emulation v2 series, the documentation should state that the new
KVM_CAP_MSI_DEVID capability tells userland about the need to provide
the device ID.
Cheers,
Andre.
>
> ---
>
> 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
> ---
> 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 bea8de7..3d920cd 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 9a261e5..39ec164 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -829,7 +829,10 @@ 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 {
> @@ -844,6 +847,7 @@ 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;
>
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