From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Auger Subject: [PATCH 1/7] KVM: api: add kvm_irq_routing_extended_msi Date: Mon, 29 Jun 2015 17:37:11 +0200 Message-ID: <1435592237-17924-2-git-send-email-eric.auger@linaro.org> References: <1435592237-17924-1-git-send-email-eric.auger@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: pbonzini@redhat.com, p.fedin@samsung.com, linux-kernel@vger.kernel.org, patches@linaro.org To: eric.auger@st.com, eric.auger@linaro.org, linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com, christoffer.dall@linaro.org, andre.przywara@arm.com, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Return-path: In-Reply-To: <1435592237-17924-1-git-send-email-eric.auger@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.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 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 --- 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