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Re: [Qemu-devel] [PATCH 2/5] pci: Add interface names to hybrid PCI devi
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH 2/5] pci: Add interface names to hybrid PCI devices |
Date: |
Fri, 25 Aug 2017 16:18:58 -0300 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Wed, Aug 23, 2017 at 07:14:42PM -0300, Eduardo Habkost wrote:
> The following devices support both PCIe and legacy PCI, by
> including special code to handle the QEMU_PCI_CAP_EXPRESS flag:
>
> * vfio-pci (is_express=1, but legacy PCI handled by
> vfio_populate_device())
> * vmxnet3 (is_express=0, but PCIe handled by vmxnet3_realize())
> * pvscsi (is_express=0, but PCIe handled by pvscsi_realize())
> * virtio-pci (is_express=0, but PCIe handled by
> virtio_pci_dc_realize(), and additional legacy PCI code at
> virtio_pci_realize())
Oh, the rules are even messier than that: QEMU_PCI_CAP_EXPRESS
controls _some_ of the code that makes a device become a PCI
Express device, but not every case.
In addition to vmxnet3, pvscsi and virtio-pci, PCIe caps
initialization is conditional on hcd-xhci (see below).
This means xhci is also a hybrid device. But it doesn't seem to
clear QEMU_PCI_CAP_EXPRESS. Doesn't it mean pci_config_size() is
broken if xhci is plugged to a legacy PCI bus? How does it
affect migration?
Full list of pci_endpoint_cap*_init() calls:
hw/usb/hcd-xhci.c- if (pci_bus_is_express(dev->bus) ||
hw/usb/hcd-xhci.c- xhci_get_flag(xhci, XHCI_FLAG_FORCE_PCIE_ENDCAP)) {
hw/usb/hcd-xhci.c: ret = pcie_endpoint_cap_init(dev, 0xa0);
hw/net/vmxnet3.c- if (pci_is_express(pci_dev)) {
hw/net/vmxnet3.c- if (pci_bus_is_express(pci_dev->bus)) {
hw/net/vmxnet3.c: pcie_endpoint_cap_init(pci_dev,
VMXNET3_EXP_EP_OFFSET);
hw/net/vmxnet3.c- }
hw/scsi/megasas.c- if (pci_is_express(dev)) {
hw/scsi/megasas.c: pcie_endpoint_cap_init(dev, 0xa0);
hw/scsi/megasas.c- }
hw/scsi/vmw_pvscsi.c- if (pci_is_express(pci_dev) &&
pci_bus_is_express(pci_dev->bus)) {
hw/scsi/vmw_pvscsi.c: pcie_endpoint_cap_init(pci_dev,
PVSCSI_EXP_EP_OFFSET);
hw/scsi/vmw_pvscsi.c- }
hw/virtio/virtio-pci.c- if (pcie_port && pci_is_express(pci_dev)) {
hw/virtio/virtio-pci.c- int pos;
hw/virtio/virtio-pci.c-
hw/virtio/virtio-pci.c: pos = pcie_endpoint_cap_init(pci_dev, 0);
Note: on megasas, pci_endpoitn_cap_init() is conditional on
pci_is_express(), but pci_is_express() will never be false on
megasas-gen2 (because QEMU_PCI_CAP_EXPRESS is always set).
Full list of unconditional pci_endpoint_cap*init() calls:
hw/block/nvme.c: pcie_endpoint_cap_init(&n->parent_obj, 0x80);
hw/net/e1000e.c: if (pcie_endpoint_cap_v1_init(pci_dev, e1000e_pcie_offset)
< 0) {
hw/pci-bridge/pcie_root_port.c: rc = pcie_cap_init(d, rpc->exp_offset,
PCI_EXP_TYPE_ROOT_PORT,
hw/pci-bridge/pcie_root_port.c- p->port, errp);
hw/pci-bridge/xio3130_downstream.c: rc = pcie_cap_init(d,
XIO3130_EXP_OFFSET, PCI_EXP_TYPE_DOWNSTREAM,
hw/pci-bridge/xio3130_downstream.c- p->port, errp);
hw/pci-bridge/xio3130_upstream.c: rc = pcie_cap_init(d, XIO3130_EXP_OFFSET,
PCI_EXP_TYPE_UPSTREAM,
hw/pci-bridge/xio3130_upstream.c- p->port, errp);
hw/pci-host/xilinx-pcie.c: if (pcie_endpoint_cap_v1_init(dev, 0x80) < 0) {
>
> Signed-off-by: Eduardo Habkost <address@hidden>
> ---
> hw/net/vmxnet3.c | 5 +++++
> hw/scsi/vmw_pvscsi.c | 2 ++
> hw/vfio/pci.c | 5 +++++
> hw/virtio/virtio-pci.c | 5 +++++
> 4 files changed, 17 insertions(+)
>
> diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
> index a19a7a3..61feacf 100644
> --- a/hw/net/vmxnet3.c
> +++ b/hw/net/vmxnet3.c
> @@ -2651,6 +2651,11 @@ static const TypeInfo vmxnet3_info = {
> .instance_size = sizeof(VMXNET3State),
> .class_init = vmxnet3_class_init,
> .instance_init = vmxnet3_instance_init,
> + .interfaces = (InterfaceInfo[]) {
> + { INTERFACE_PCIE_DEVICE },
> + { INTERFACE_LEGACY_PCI_DEVICE },
> + { }
> + },
> };
>
> static void vmxnet3_register_types(void)
> diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
> index 77d8b6f..40dfffa 100644
> --- a/hw/scsi/vmw_pvscsi.c
> +++ b/hw/scsi/vmw_pvscsi.c
> @@ -1300,6 +1300,8 @@ static const TypeInfo pvscsi_info = {
> .class_init = pvscsi_class_init,
> .interfaces = (InterfaceInfo[]) {
> { TYPE_HOTPLUG_HANDLER },
> + { INTERFACE_PCIE_DEVICE },
> + { INTERFACE_LEGACY_PCI_DEVICE },
> { }
> }
> };
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index 31e1edf..2b21391 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -3023,6 +3023,11 @@ static const TypeInfo vfio_pci_dev_info = {
> .class_init = vfio_pci_dev_class_init,
> .instance_init = vfio_instance_init,
> .instance_finalize = vfio_instance_finalize,
> + .interfaces = (InterfaceInfo[]) {
> + { INTERFACE_PCIE_DEVICE },
> + { INTERFACE_LEGACY_PCI_DEVICE },
> + { }
> + },
> };
>
> static void register_vfio_pci_dev_type(void)
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 8b0d6b6..8c0b6bf 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1958,6 +1958,11 @@ static const TypeInfo virtio_pci_info = {
> .class_init = virtio_pci_class_init,
> .class_size = sizeof(VirtioPCIClass),
> .abstract = true,
> + .interfaces = (InterfaceInfo[]) {
> + { INTERFACE_PCIE_DEVICE },
> + { INTERFACE_LEGACY_PCI_DEVICE },
> + { }
> + },
> };
>
> /* virtio-blk-pci */
> --
> 2.9.4
>
>
--
Eduardo