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virtio-balloon-pci: Allow setting nvectors, so we can use MSI-X

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Most virtio-pci devices allow MSI-X. Add it to virtio-balloon-pci, but
only enable it in new machine types, so we don't break migration of
existing machine types between different qemu versions.

This copies what was done for virtio-rng-pci in:
9ea02e8f13 ("virtio-rng-pci: Allow setting nvectors, so we can use MSI-X")
bad9c5a516 ("virtio-rng-pci: fix migration compat for vectors")
62bdb88715 ("virtio-rng-pci: fix transitional migration compat for vectors")

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Reza Arbab <arbab@linux.ibm.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Message-ID: <20250115161425.246348-1-arbab@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Reza Arbab 2025-01-15 10:14:25 -06:00 • committed by Thomas Huth
parent a4cda3f5df
commit fe638ae67b
2 changed files with 15 additions and 0 deletions
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12
hw/virtio/virtio-balloon-pci.c
View file

@ -35,11 +35,22 @@ struct VirtIOBalloonPCI {
VirtIOBalloon vdev;
};
static const Property virtio_balloon_properties[] = {
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
DEV_NVECTORS_UNSPECIFIED),
};
static void virtio_balloon_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
vpci_dev->nvectors = 2;
}
vpci_dev->class_code = PCI_CLASS_OTHERS;
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
}
@ -55,6 +66,7 @@ static void virtio_balloon_pci_class_init(ObjectClass *klass, void *data)
pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
pcidev_k->class_id = PCI_CLASS_OTHERS;
device_class_set_props(dc, virtio_balloon_properties);
}
static void virtio_balloon_pci_instance_init(Object *obj)