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KVM: Userspace controlled irq routing

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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>
This commit is contained in:
Avi Kivity 2008-11-19 13:58:46 +02:00
parent 1935547504
commit 399ec807dd
6 changed files with 275 additions and 4 deletions
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31
include/linux/kvm_host.h
View file

@ -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