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bhyve: Split out a lower-level helper for VirtIO interrupts.

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This allows device models to assert VirtIO interrupts for reasons
other than publishing changes to a VirtIO ring such as configuration
changes.

Reviewed by:	grehan, markj
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D30505
This commit is contained in:
John Baldwin 2021-06-11 17:59:35 -07:00
parent 8794846a91
commit c06676bee3
1 changed files with 22 additions and 11 deletions
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33
usr.sbin/bhyve/virtio.h
View File

@ -348,22 +348,33 @@ vq_has_descs(struct vqueue_info *vq)
}
/*
* Deliver an interrupt to guest on the given virtual queue
* (if possible, or a generic MSI interrupt if not using MSI-X).
* Deliver an interrupt to the guest for a specific MSI-X queue or
* event.
*/
static inline void
vi_interrupt(struct virtio_softc *vs, uint8_t isr, uint16_t msix_idx)
{
if (pci_msix_enabled(vs->vs_pi))
pci_generate_msix(vs->vs_pi, msix_idx);
else {
VS_LOCK(vs);
vs->vs_isr |= isr;
pci_generate_msi(vs->vs_pi, 0);
pci_lintr_assert(vs->vs_pi);
VS_UNLOCK(vs);
}
}
/*
* Deliver an interrupt to the guest on the given virtual queue (if
* possible, or a generic MSI interrupt if not using MSI-X).
*/
static inline void
vq_interrupt(struct virtio_softc *vs, struct vqueue_info *vq)
{
if (pci_msix_enabled(vs->vs_pi))
pci_generate_msix(vs->vs_pi, vq->vq_msix_idx);
else {
VS_LOCK(vs);
vs->vs_isr |= VIRTIO_PCI_ISR_INTR;
pci_generate_msi(vs->vs_pi, 0);
pci_lintr_assert(vs->vs_pi);
VS_UNLOCK(vs);
}
vi_interrupt(vs, VIRTIO_PCI_ISR_INTR, vq->vq_msix_idx);
}
static inline void