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KVM: Fix guest shared interrupt with in-kernel irqchip

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Every call of kvm_set_irq() should offer an irq_source_id, which is
allocated by kvm_request_irq_source_id(). Based on irq_source_id, we
identify the irq source and implement logical OR for shared level
interrupts.

The allocated irq_source_id can be freed by kvm_free_irq_source_id().

Currently, we support at most sizeof(unsigned long) different irq sources.

[Amit: - rebase to kvm.git HEAD
       - move definition of KVM_USERSPACE_IRQ_SOURCE_ID to common file
       - move kvm_request_irq_source_id to the update_irq ioctl]

[Xiantao: - Add kvm/ia64 stuff and make it work for kvm/ia64 guests]

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang
2008-10-15 20:15:06 +08:00
committed by Avi Kivity
parent 6ad9f15c94
commit 5550af4df1
9 changed files with 79 additions and 14 deletions
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7
include/linux/kvm_host.h
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@@ -37,6 +37,8 @@
#define KVM_REQ_UNHALT 6
#define KVM_REQ_MMU_SYNC 7
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;
@@ -306,15 +308,18 @@ struct kvm_assigned_dev_kernel {
int host_irq;
int guest_irq;
int irq_requested;
int irq_source_id;
struct pci_dev *dev;
struct kvm *kvm;
};
void kvm_set_irq(struct kvm *kvm, int irq, int level);
void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
int kvm_request_irq_source_id(struct kvm *kvm);
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
#ifdef CONFIG_DMAR
int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,