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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_host.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_host.h')
-rw-r--r--include/linux/kvm_host.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 99963f36a6d..ce285e01bd5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -107,6 +107,19 @@ struct kvm_memory_slot {
int user_alloc;
};
+struct kvm_kernel_irq_routing_entry {
+ u32 gsi;
+ void (*set)(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int level);
+ union {
+ struct {
+ unsigned irqchip;
+ unsigned pin;
+ } irqchip;
+ };
+ struct list_head link;
+};
+
struct kvm {
struct mutex lock; /* protects the vcpus array and APIC accesses */
spinlock_t mmu_lock;
@@ -128,6 +141,7 @@ struct kvm {
#endif
#ifdef CONFIG_HAVE_KVM_IRQCHIP
+ struct list_head irq_routing; /* of kvm_kernel_irq_routing_entry */
struct hlist_head mask_notifier_list;
#endif
@@ -480,4 +494,21 @@ static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_se
}
#endif
+#ifdef CONFIG_HAVE_KVM_IRQCHIP
+
+#define KVM_MAX_IRQ_ROUTES 1024
+
+int kvm_setup_default_irq_routing(struct kvm *kvm);
+int kvm_set_irq_routing(struct kvm *kvm,
+ const struct kvm_irq_routing_entry *entries,
+ unsigned nr,
+ unsigned flags);
+void kvm_free_irq_routing(struct kvm *kvm);
+
+#else
+
+static inline void kvm_free_irq_routing(struct kvm *kvm) {}
+
+#endif
+
#endif