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Date: Mon, 1 Sep 2014 14:52:44 +0200 From: Eric Auger <eric.auger@...aro.org> To: eric.auger@...com, eric.auger@...aro.org, christoffer.dall@...aro.org, marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org, alex.williamson@...hat.com, joel.schopp@....com, kim.phillips@...escale.com, paulus@...ba.org, gleb@...nel.org, pbonzini@...hat.com Cc: linux-kernel@...r.kernel.org, patches@...aro.org, will.deacon@....com, a.motakis@...tualopensystems.com, a.rigo@...tualopensystems.com, john.liuli@...wei.com Subject: [RFC v2 5/9] KVM: KVM-VFIO: update user API to program forwarded IRQ add new device group commands: - KVM_DEV_VFIO_DEVICE_FORWARD_IRQ and KVM_DEV_VFIO_DEVICE_UNFORWARD_IRQ which enable to turn forwarded IRQ mode on/off. the kvm_arch_forwarded_irq struct embodies a forwarded IRQ Signed-off-by: Eric Auger <eric.auger@...aro.org> --- v1 -> v2: - struct kvm_arch_forwarded_irq moved from arch/arm/include/uapi/asm/kvm.h to include/uapi/linux/kvm.h also irq_index renamed into index and guest_irq renamed into gsi - ASSIGN/DEASSIGN renamed into FORWARD/UNFORWARD --- Documentation/virtual/kvm/devices/vfio.txt | 26 ++++++++++++++++++++++++++ include/uapi/linux/kvm.h | 9 +++++++++ 2 files changed, 35 insertions(+) diff --git a/Documentation/virtual/kvm/devices/vfio.txt b/Documentation/virtual/kvm/devices/vfio.txt index ef51740..048baa0 100644 --- a/Documentation/virtual/kvm/devices/vfio.txt +++ b/Documentation/virtual/kvm/devices/vfio.txt @@ -13,6 +13,7 @@ VFIO-group is held by KVM. Groups: KVM_DEV_VFIO_GROUP + KVM_DEV_VFIO_DEVICE KVM_DEV_VFIO_GROUP attributes: KVM_DEV_VFIO_GROUP_ADD: Add a VFIO group to VFIO-KVM device tracking @@ -20,3 +21,28 @@ KVM_DEV_VFIO_GROUP attributes: For each, kvm_device_attr.addr points to an int32_t file descriptor for the VFIO group. + +KVM_DEV_VFIO_DEVICE attributes: + KVM_DEV_VFIO_DEVICE_FORWARD_IRQ + KVM_DEV_VFIO_DEVICE_UNFORWARD_IRQ + +For each, kvm_device_attr.addr points to a kvm_arch_forwarded_irq struct. +This user API makes possible to create a special IRQ handling mode, +where KVM and a VFIO platform driver collaborate to improve IRQ +handling performance. + +fd represents the file descriptor of a valid VFIO device whose physical +IRQ, referenced by its index, is injected into the VM guest irq (gsi). + +On FORWARD_IRQ, KVM-VFIO device programs: +- the host, to not complete the physical IRQ itself. +- the GIC, to automatically complete the physical IRQ when the guest + completes the virtual IRQ. +This avoids trapping the end-of-interrupt for level sensitive IRQ. + +On UNFORWARD_IRQ, one returns to the mode where the host completes the +physical IRQ and the guest completes the virtual IRQ. + +It is up to the caller of this API to make sure the IRQ is not +outstanding when the FORWARD/UNFORWARD is called. This could lead to +some inconsistency on who is going to complete the IRQ. diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index cf3a2ff..8cd7b0e 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -947,6 +947,12 @@ struct kvm_device_attr { __u64 addr; /* userspace address of attr data */ }; +struct kvm_arch_forwarded_irq { + __u32 fd; /* file desciptor of the VFIO device */ + __u32 index; /* VFIO device IRQ index */ + __u32 gsi; /* gsi, ie. virtual IRQ number */ +}; + #define KVM_DEV_TYPE_FSL_MPIC_20 1 #define KVM_DEV_TYPE_FSL_MPIC_42 2 #define KVM_DEV_TYPE_XICS 3 @@ -954,6 +960,9 @@ struct kvm_device_attr { #define KVM_DEV_VFIO_GROUP 1 #define KVM_DEV_VFIO_GROUP_ADD 1 #define KVM_DEV_VFIO_GROUP_DEL 2 +#define KVM_DEV_VFIO_DEVICE 2 +#define KVM_DEV_VFIO_DEVICE_FORWARD_IRQ 1 +#define KVM_DEV_VFIO_DEVICE_UNFORWARD_IRQ 2 #define KVM_DEV_TYPE_ARM_VGIC_V2 5 #define KVM_DEV_TYPE_FLIC 6 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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