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Re: [Qemu-devel] [PATCH] hw/pci-bridge: check invalid slot number for ro
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] hw/pci-bridge: check invalid slot number for root and downstream port |
Date: |
Fri, 14 Dec 2018 16:12:32 -0500 |
On Wed, Dec 05, 2018 at 05:41:26PM +0800, Huan Xiong wrote:
> Since root and downstream port have only one slot, device should be
> connected to them using slot 0. QEMU doesn't have a check for that
> and starts up when a non-zero slot is specified, though the device
> is not seen in guest OS.
>
> The change fixes that by adding a check in PCI device "attr" property
> setter function. The check is performed only if a PCI device has been
> connected to a bus, otherwise it does nothing. The latter occurs because
> setter function is also called in object instantiation phase to set
> property default value.
>
> Signed-off-by: Huan Xiong <address@hidden>
I thought that a non 0 slot is useful for ARI. No?
> ---
> hw/core/qdev-properties.c | 5 ++++-
> hw/pci-bridge/pcie_root_port.c | 2 +-
> hw/pci-bridge/xio3130_downstream.c | 2 +-
> hw/pci/pci.c | 13 +++++++++++++
> include/hw/pci/pci.h | 1 +
> 5 files changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
> index 35072de..6e79219 100644
> --- a/hw/core/qdev-properties.c
> +++ b/hw/core/qdev-properties.c
> @@ -654,6 +654,8 @@ static void set_pci_devfn(Object *obj, Visitor *v, const
> char *name,
> void *opaque, Error **errp)
> {
> DeviceState *dev = DEVICE(obj);
> + BusState *bus = qdev_get_parent_bus(dev);
> + BusClass *bus_class = bus ? BUS_GET_CLASS(bus) : NULL;
> Property *prop = opaque;
> int32_t value, *ptr = qdev_get_prop_ptr(dev, prop);
> unsigned int slot, fn, n;
> @@ -687,7 +689,8 @@ static void set_pci_devfn(Object *obj, Visitor *v, const
> char *name,
> goto invalid;
> }
> }
> - if (str[n] != '\0' || fn > 7 || slot > 31) {
> + if (str[n] != '\0' || fn > 7 || slot > 31 || (bus_class &&
> + bus_class->max_dev != 0 && slot >= bus_class->max_dev)) {
> goto invalid;
> }
This looks kind of complicated. Isn't there an easier way?
> *ptr = slot << 3 | fn;
> diff --git a/hw/pci-bridge/pcie_root_port.c b/hw/pci-bridge/pcie_root_port.c
> index 45f9e8c..ee42411 100644
> --- a/hw/pci-bridge/pcie_root_port.c
> +++ b/hw/pci-bridge/pcie_root_port.c
> @@ -61,7 +61,7 @@ static void rp_realize(PCIDevice *d, Error **errp)
> int rc;
>
> pci_config_set_interrupt_pin(d->config, 1);
> - pci_bridge_initfn(d, TYPE_PCIE_BUS);
> + pci_bridge_initfn(d, TYPE_PCIE_DOWNSTREAM_BUS);
> pcie_port_init_reg(d);
>
> rc = pci_bridge_ssvid_init(d, rpc->ssvid_offset, dc->vendor_id,
> diff --git a/hw/pci-bridge/xio3130_downstream.c
> b/hw/pci-bridge/xio3130_downstream.c
> index 467bbab..960a90c 100644
> --- a/hw/pci-bridge/xio3130_downstream.c
> +++ b/hw/pci-bridge/xio3130_downstream.c
> @@ -62,7 +62,7 @@ static void xio3130_downstream_realize(PCIDevice *d, Error
> **errp)
> PCIESlot *s = PCIE_SLOT(d);
> int rc;
>
> - pci_bridge_initfn(d, TYPE_PCIE_BUS);
> + pci_bridge_initfn(d, TYPE_PCIE_DOWNSTREAM_BUS);
> pcie_port_init_reg(d);
>
> rc = msi_init(d, XIO3130_MSI_OFFSET, XIO3130_MSI_NR_VECTOR,
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 56b13b3..457736d 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -187,6 +187,18 @@ static const TypeInfo pcie_bus_info = {
> .parent = TYPE_PCI_BUS,
> };
>
> +static void pcie_downstream_bus_class_init(ObjectClass *klass, void *data)
> +{
> + BusClass *k = BUS_CLASS(klass);
> + k->max_dev = 1;
> +}
> +
> +static const TypeInfo pcie_downstream_bus_info = {
> + .name = TYPE_PCIE_DOWNSTREAM_BUS,
> + .parent = TYPE_PCIE_BUS,
> + .class_init = pcie_downstream_bus_class_init,
> +};
> +
> static PCIBus *pci_find_bus_nr(PCIBus *bus, int bus_num);
> static void pci_update_mappings(PCIDevice *d);
> static void pci_irq_handler(void *opaque, int irq_num, int level);
> @@ -2681,6 +2693,7 @@ static void pci_register_types(void)
> {
> type_register_static(&pci_bus_info);
> type_register_static(&pcie_bus_info);
> + type_register_static(&pcie_downstream_bus_info);
> type_register_static(&conventional_pci_interface_info);
> type_register_static(&pcie_interface_info);
> type_register_static(&pci_device_type_info);
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index e6514bb..2253757 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -393,6 +393,7 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque,
> int pin);
> #define PCI_BUS_CLASS(klass) OBJECT_CLASS_CHECK(PCIBusClass, (klass),
> TYPE_PCI_BUS)
> #define PCI_BUS_GET_CLASS(obj) OBJECT_GET_CLASS(PCIBusClass, (obj),
> TYPE_PCI_BUS)
> #define TYPE_PCIE_BUS "PCIE"
> +#define TYPE_PCIE_DOWNSTREAM_BUS "PCIE-downstream"
>
> bool pci_bus_is_express(PCIBus *bus);
> bool pci_bus_is_root(PCIBus *bus);
> --
> 2.7.4