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Commit a76beb14 authored by Alex Williamson's avatar Alex Williamson Committed by Avi Kivity
Browse files

KVM: Fix device assignment threaded irq handler 

The kernel no longer allows us to pass NULL for the hard handler
without also specifying IRQF_ONESHOT.  IRQF_ONESHOT imposes latency
in the exit path that we don't need for MSI interrupts.  Long term
we'd like to inject these interrupts from the hard handler when
possible.  In the short term, we can create dummy hard handlers
that return us to the previous behavior.  Credit to Michael for
original patch.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=43328



Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 055c9fa8

virt/kvm/assigned-dev.c

+13 −2
Original line number Diff line number Diff line
@@ -334,6 +334,11 @@ static int assigned_device_enable_host_intx(struct kvm *kvm, 
}



#ifdef __KVM_HAVE_MSI

static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)

{

	return IRQ_WAKE_THREAD;

}



static int assigned_device_enable_host_msi(struct kvm *kvm,

					   struct kvm_assigned_dev_kernel *dev)

{
@@ -346,7 +351,7 @@ static int assigned_device_enable_host_msi(struct kvm *kvm, 
	}



	dev->host_irq = dev->dev->irq;

	if (request_threaded_irq(dev->host_irq, NULL,

	if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,

				 kvm_assigned_dev_thread_msi, 0,

				 dev->irq_name, dev)) {

		pci_disable_msi(dev->dev);
@@ -358,6 +363,11 @@ static int assigned_device_enable_host_msi(struct kvm *kvm, 
#endif



#ifdef __KVM_HAVE_MSIX

static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)

{

	return IRQ_WAKE_THREAD;

}



static int assigned_device_enable_host_msix(struct kvm *kvm,

					    struct kvm_assigned_dev_kernel *dev)

{
@@ -374,7 +384,8 @@ static int assigned_device_enable_host_msix(struct kvm *kvm, 


	for (i = 0; i < dev->entries_nr; i++) {

		r = request_threaded_irq(dev->host_msix_entries[i].vector,

					 NULL, kvm_assigned_dev_thread_msix,

					 kvm_assigned_dev_msix,

					 kvm_assigned_dev_thread_msix,

					 0, dev->irq_name, dev);

		if (r)

			goto err;