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| author | Yang Zhang <yang.z.zhang@Intel.com> | 2013-01-25 06:18:51 +0400 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-01-29 12:48:19 +0400 |
| commit | c7c9c56ca26f7b9458711b2d78b60b60e0d38ba7 (patch) | |
| tree | feab61b2f3a5587dd502a9d2bf4b27a8b2ebe507 /virt/kvm/irq_comm.c | |
| parent | 8d14695f9542e9e0195d6e41ddaa52c32322adf5 (diff) | |
| download | linux-c7c9c56ca26f7b9458711b2d78b60b60e0d38ba7.tar.xz | |
x86, apicv: add virtual interrupt delivery support
Virtual interrupt delivery avoids KVM to inject vAPIC interrupts
manually, which is fully taken care of by the hardware. This needs
some special awareness into existing interrupr injection path:
- for pending interrupt, instead of direct injection, we may need
update architecture specific indicators before resuming to guest.
- A pending interrupt, which is masked by ISR, should be also
considered in above update action, since hardware will decide
when to inject it at right time. Current has_interrupt and
get_interrupt only returns a valid vector from injection p.o.v.
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'virt/kvm/irq_comm.c')
| -rw-r--r-- | virt/kvm/irq_comm.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 656fa455e154..ff6d40e2c06d 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -22,6 +22,7 @@ #include <linux/kvm_host.h> #include <linux/slab.h> +#include <linux/export.h> #include <trace/events/kvm.h> #include <asm/msidef.h> @@ -237,6 +238,28 @@ int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level) return ret; } +bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin) +{ + struct kvm_irq_ack_notifier *kian; + struct hlist_node *n; + int gsi; + + rcu_read_lock(); + gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; + if (gsi != -1) + hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list, + link) + if (kian->gsi == gsi) { + rcu_read_unlock(); + return true; + } + + rcu_read_unlock(); + + return false; +} +EXPORT_SYMBOL_GPL(kvm_irq_has_notifier); + void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) { struct kvm_irq_ack_notifier *kian; @@ -261,6 +284,7 @@ void kvm_register_irq_ack_notifier(struct kvm *kvm, mutex_lock(&kvm->irq_lock); hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list); mutex_unlock(&kvm->irq_lock); + kvm_ioapic_make_eoibitmap_request(kvm); } void kvm_unregister_irq_ack_notifier(struct kvm *kvm, @@ -270,6 +294,7 @@ void kvm_unregister_irq_ack_notifier(struct kvm *kvm, hlist_del_init_rcu(&kian->link); mutex_unlock(&kvm->irq_lock); synchronize_rcu(); + kvm_ioapic_make_eoibitmap_request(kvm); } int kvm_request_irq_source_id(struct kvm *kvm) |