Hi Zhenzhong,
On 2/1/24 08:28, Zhenzhong Duan wrote:
> From: Yi Liu
>
> This adds pci_device_set/unset_iommu_device() to set/unset
> HostIOMMUDevice for a given PCIe device. Caller of set
> should fail if set operation fails.
>
> Extract out pci_device_get_iommu_bus_devfn() to facilitate
> implementation of pci_device_set/unset_iommu_device().
>
> Signed-off-by: Yi Liu
> Signed-off-by: Yi Sun
> Signed-off-by: Nicolin Chen
> Signed-off-by: Zhenzhong Duan
> ---
> include/hw/pci/pci.h | 38 ++-
> hw/pci/pci.c | 62 +---
> 2 files changed, 96 insertions(+), 4 deletions(-)
>
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index fa6313aabc..5b471fd380 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -3,6 +3,7 @@
>
> #include "exec/memory.h"
> #include "sysemu/dma.h"
> +#include "sysemu/host_iommu_device.h"
>
> /* PCI includes legacy ISA access. */
> #include "hw/isa/isa.h"
> @@ -384,10 +385,45 @@ typedef struct PCIIOMMUOps {
> *
> * @devfn: device and function number
> */
> - AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
> +AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int
> devfn);
> +/**
> + * @set_iommu_device: set iommufd device for a PCI device to vIOMMU
attach a HostIOMMUDevice to a vIOMMU
> + *
> + * Optional callback, if not implemented in vIOMMU, then vIOMMU can't
> + * utilize iommufd specific features.
looks too iommufd specific. Then vIOMMU can't retrieve host information
from the associated HostIOMMUDevice
> + *
> + * Return true if iommufd device is accepted, or else return false with
s/accepted/attached
> + * errp set.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + *
> + * @dev: the data structure representing host assigned device.
> + *
> + */
> +int (*set_iommu_device)(PCIBus *bus, void *opaque, int devfn,
> +HostIOMMUDevice *dev, Error **errp);
> +/**
> + * @unset_iommu_device: unset iommufd device for a PCI device from vIOMMU
same suggestion here
> + *
> + * Optional callback.
> + *
> + * @bus: the #PCIBus of the PCI device.
> + *
> + * @opaque: the data passed to pci_setup_iommu().
> + *
> + * @devfn: device and function number of the PCI device.
> + */
> +void (*unset_iommu_device)(PCIBus *bus, void *opaque, int devfn);
> } PCIIOMMUOps;
>
> AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
> +int pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *base_dev,
> +Error **errp);
> +void pci_device_unset_iommu_device(PCIDevice *dev);
>
> /**
> * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 76080af580..8078307963 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2672,11 +2672,14 @@ static void pci_device_class_base_init(ObjectClass
> *klass, void *data)
> }
> }
>
> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev,
> + PCIBus **aliased_bus,
> + PCIBus **piommu_bus,
> + int *aliased_devfn)
> {
> PCIBus *bus = pci_get_bus(dev);
> PCIBus *iommu_bus = bus;
> -uint8_t devfn = dev->devfn;
> +int devfn = dev->devfn;
>
> while (iommu_bus && !iommu_bus->iommu_ops && iommu_bus->parent_dev) {
> PCIBus *parent_bus = pci_get_bus(iommu_bus->parent_dev);
> @@ -2717,13 +2720,66 @@ AddressSpace
> *pci_device_iommu_address_space(PCIDevice *dev)
>
> iommu_bus = parent_bus;
> }
> -if (!pci_bus_bypass_iommu(bus) && iommu_bus->iommu_ops) {
> +
> +assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
> +assert(iommu_bus);
> +
> +if (pci_bus_bypass_iommu(bus) || !iommu_bus->iommu_ops) {
> +iommu_bus = NULL;
> +}
> +
> +*piommu_bus = iommu_bus;
> +
> +if (aliased_bus) {
> +*aliased_bus = bus;
> +}
> +
> +if (aliased_devfn) {
> +*aliased_devfn = devfn;
> +}
> +}
> +
> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +{
> +PCIBus *bus;
> +PCIBus *iommu_bus;
> +int devfn;
> +
> +pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
> +if (iommu_bus) {
> return iommu_bus->iommu_ops->get_address_space(bus,
> iommu_bus->iommu_opaque, devfn);
> }
> return &address_space_memory;
> }
>
> +int pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *base_dev,
> +Error **errp)
> +{
> +
