git: e8b442c74c90 - stable/13 - bhyve: Split out a lower-level helper for VirtIO interrupts.

[John Baldwin]

The branch stable/13 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=e8b442c74c903dfd020a83ebba7d1b3c2c281aba

commit e8b442c74c903dfd020a83ebba7d1b3c2c281aba
Author:     John Baldwin <jhb at FreeBSD.org>
AuthorDate: 2021-06-12 00:59:35 +0000
Commit:     John Baldwin <jhb at FreeBSD.org>
CommitDate: 2021-08-12 17:01:25 +0000

    bhyve: Split out a lower-level helper for VirtIO interrupts.
    
    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
    
    (cherry picked from commit c06676bee3d228ac18c5ed3604304e932eb84c1e)
---
 usr.sbin/bhyve/virtio.h | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/usr.sbin/bhyve/virtio.h b/usr.sbin/bhyve/virtio.h
index e03fd5f710d1..5b2cf6fe2cc8 100644
--- a/usr.sbin/bhyve/virtio.h
+++ b/usr.sbin/bhyve/virtio.h
@@ -332,24 +332,35 @@ 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
-vq_interrupt(struct virtio_softc *vs, struct vqueue_info *vq)
+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, vq->vq_msix_idx);
+		pci_generate_msix(vs->vs_pi, msix_idx);
 	else {
 		VS_LOCK(vs);
-		vs->vs_isr |= VIRTIO_PCI_ISR_INTR;
+		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)
+{
+
+	vi_interrupt(vs, VIRTIO_PCI_ISR_INTR, vq->vq_msix_idx);
+}
+
 static inline void
 vq_kick_enable(struct vqueue_info *vq)
 {