forked from Minki/linux
kvm: deliver msi interrupts from irq handler
We can deliver certain interrupts, notably MSI, from atomic context. Use kvm_set_irq_inatomic, to implement an irq handler for msi. This reduces the pressure on scheduler in case where host and guest irq share a host cpu. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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@ -105,6 +105,15 @@ static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
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}
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#ifdef __KVM_HAVE_MSI
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static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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int ret = kvm_set_irq_inatomic(assigned_dev->kvm,
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assigned_dev->irq_source_id,
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assigned_dev->guest_irq, 1);
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return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
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}
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static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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@ -117,6 +126,23 @@ static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
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#endif
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#ifdef __KVM_HAVE_MSIX
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static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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int index = find_index_from_host_irq(assigned_dev, irq);
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u32 vector;
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int ret = 0;
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if (index >= 0) {
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vector = assigned_dev->guest_msix_entries[index].vector;
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ret = kvm_set_irq_inatomic(assigned_dev->kvm,
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assigned_dev->irq_source_id,
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vector, 1);
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}
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return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
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}
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static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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@ -334,11 +360,6 @@ static int assigned_device_enable_host_intx(struct kvm *kvm,
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}
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#ifdef __KVM_HAVE_MSI
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static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
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{
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return IRQ_WAKE_THREAD;
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}
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static int assigned_device_enable_host_msi(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev)
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{
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@ -363,11 +384,6 @@ static int assigned_device_enable_host_msi(struct kvm *kvm,
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#endif
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#ifdef __KVM_HAVE_MSIX
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static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
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{
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return IRQ_WAKE_THREAD;
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}
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static int assigned_device_enable_host_msix(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev)
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{
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