Hi Xingang,
On 2/27/21 9:33 AM, Wang Xingang wrote:
> From: Xingang Wang <wangxinga...@huawei.com>
>
> This Property can be useful to check whether this bus is attached to iommu.
Strictly speaking this is not a Property (QEMU property) but a flag
>
> Signed-off-by: Xingang Wang <wangxinga...@huawei.com>
> Signed-off-by: Jiahui Cen <cenjia...@huawei.com>
> ---
> include/hw/pci/pci_bus.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
> index 347440d42c..42109e8a06 100644
> --- a/include/hw/pci/pci_bus.h
> +++ b/include/hw/pci/pci_bus.h
> @@ -24,6 +24,8 @@ enum PCIBusFlags {
> PCI_BUS_IS_ROOT = 0x0001,
> /* PCIe extended configuration space is accessible on this bus */
> PCI_BUS_EXTENDED_CONFIG_SPACE = 0x0002,
> + /* Iommu is enabled on this bus */
s/Iommu/IOMMU here and elsewhere
> + PCI_BUS_IOMMU = 0x0004,
> };
>
> struct PCIBus {
> @@ -63,4 +65,15 @@ static inline bool
> pci_bus_allows_extended_config_space(PCIBus *bus)
> return !!(bus->flags & PCI_BUS_EXTENDED_CONFIG_SPACE);
> }
>
> +static inline bool pci_bus_has_iommu(PCIBus *bus)
> +{
> + PCIBus *root_bus = bus;
> +
> + while (root_bus && !pci_bus_is_root(root_bus)) {
> + root_bus = pci_get_bus(root_bus->parent_dev);
> + }
> +
> + return !!(root_bus->flags & PCI_BUS_IOMMU);
> +}
> +
> #endif /* QEMU_PCI_BUS_H */
>
Eric
