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

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Let's do it similar as virtio-balloon-pci. With this change, we can
use virtio-mem-pci on s390x, although plugging will still fail until
properly wired up in the machine.

No need to worry about transitional/non_transitional devices, because they
don't exist for virtio-mem.

Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250128185705.1609038-2-david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
David Hildenbrand 2025-01-28 19:57:04 +01:00 • committed by Thomas Huth
parent fe638ae67b
commit 03248e714b
2 changed files with 13 additions and 0 deletions
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1
hw/core/machine.c
View file

@ -41,6 +41,7 @@ GlobalProperty hw_compat_9_2[] = {
{ "virtio-balloon-pci", "vectors", "0" },
{ "virtio-balloon-pci-transitional", "vectors", "0" },
{ "virtio-balloon-pci-non-transitional", "vectors", "0" },
{ "virtio-mem-pci", "vectors", "0" },
};
const size_t hw_compat_9_2_len = G_N_ELEMENTS(hw_compat_9_2);

12
hw/virtio/virtio-mem-pci.c
View file

@ -22,6 +22,10 @@ static void virtio_mem_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
VirtIOMEMPCI *mem_pci = VIRTIO_MEM_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&mem_pci->vdev);
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
vpci_dev->nvectors = 2;
}
virtio_pci_force_virtio_1(vpci_dev);
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
}
@ -152,6 +156,13 @@ static void virtio_mem_pci_set_requested_size(Object *obj, Visitor *v,
object_property_set(OBJECT(&pci_mem->vdev), name, v, errp);
}
static const Property virtio_mem_pci_class_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_mem_pci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@ -164,6 +175,7 @@ static void virtio_mem_pci_class_init(ObjectClass *klass, void *data)
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
pcidev_k->class_id = PCI_CLASS_OTHERS;
device_class_set_props(dc, virtio_mem_pci_class_properties);
mdc->get_addr = virtio_mem_pci_get_addr;
mdc->set_addr = virtio_mem_pci_set_addr;