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authorAvi Kivity <avi@redhat.com>2008-11-19 13:58:46 +0200
committerAvi Kivity <avi@redhat.com>2009-03-24 11:03:06 +0200
commit399ec807ddc38ecccf8c06dbde04531cbdc63e11 (patch)
tree75a4e3ee9cfffb4ecf7b4608bb592c89f2b62219 /include/linux/kvm.h
parent193554750441d91e127dd5066b8aebe0f769101c (diff)
KVM: Userspace controlled irq routing
Currently KVM has a static routing from GSI numbers to interrupts (namely, 0-15 are mapped 1:1 to both PIC and IOAPIC, and 16:23 are mapped 1:1 to the IOAPIC). This is insufficient for several reasons: - HPET requires non 1:1 mapping for the timer interrupt - MSIs need a new method to assign interrupt numbers and dispatch them - ACPI APIC mode needs to be able to reassign the PCI LINK interrupts to the ioapics This patch implements an interrupt routing table (as a linked list, but this can be easily changed) and a userspace interface to replace the table. The routing table is initialized according to the current hardwired mapping. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include/linux/kvm.h')
-rw-r--r--include/linux/kvm.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 73f348066866..7a5d73a8d4fa 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -399,6 +399,38 @@ struct kvm_trace_rec {
#if defined(CONFIG_X86)
#define KVM_CAP_REINJECT_CONTROL 24
#endif
+#if defined(CONFIG_X86)||defined(CONFIG_IA64)
+#define KVM_CAP_IRQ_ROUTING 25
+#endif
+
+#ifdef KVM_CAP_IRQ_ROUTING
+
+struct kvm_irq_routing_irqchip {
+ __u32 irqchip;
+ __u32 pin;
+};
+
+/* gsi routing entry types */
+#define KVM_IRQ_ROUTING_IRQCHIP 1
+
+struct kvm_irq_routing_entry {
+ __u32 gsi;
+ __u32 type;
+ __u32 flags;
+ __u32 pad;
+ union {
+ struct kvm_irq_routing_irqchip irqchip;
+ __u32 pad[8];
+ } u;
+};
+
+struct kvm_irq_routing {
+ __u32 nr;
+ __u32 flags;
+ struct kvm_irq_routing_entry entries[0];
+};
+
+#endif
/*
* ioctls for VM fds
@@ -430,6 +462,7 @@ struct kvm_trace_rec {
_IOW(KVMIO, 0x68, struct kvm_coalesced_mmio_zone)
#define KVM_ASSIGN_PCI_DEVICE _IOR(KVMIO, 0x69, \
struct kvm_assigned_pci_dev)
+#define KVM_SET_GSI_ROUTING _IOW(KVMIO, 0x6a, struct kvm_irq_routing)
#define KVM_ASSIGN_IRQ _IOR(KVMIO, 0x70, \
struct kvm_assigned_irq)
#define KVM_REINJECT_CONTROL _IO(KVMIO, 0x71)