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virtio: disable ioeventfd as early as possible

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Avoid "tricking" virtio-blk-dataplane into thinking that ioeventfd will be
available when it is not.  This bug has always been there, but it will break
TCG+ioeventfd=on once the dataplane code will be always used when ioeventfd=on.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-21 22:48:04 +02:00 • committed by Michael S. Tsirkin
parent 019518a80e
commit ca2b413c39
2 changed files with 8 additions and 8 deletions
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8
hw/virtio/virtio-pci.c
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@ -1719,10 +1719,6 @@ static void virtio_pci_device_plugged(DeviceState *d, Error **errp)
pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx,
PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar);
}
if (!kvm_has_many_ioeventfds()) {
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
}
}
static void virtio_pci_device_unplugged(DeviceState *d)
@ -1751,6 +1747,10 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
bool pcie_port = pci_bus_is_express(pci_dev->bus) &&
!pci_bus_is_root(pci_dev->bus);
if (!kvm_has_many_ioeventfds()) {
proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
}
/*
* virtio pci bar layout used by default.
* subclasses can re-arrange things if needed.