Re: [PATCH 4/6] hw/riscv/virt.c: add virtio-iommu-pci hotplug support

[Alistair Francis <alistair23@gmail.com>]

On Wed, Feb 14, 2024 at 5:18 AM Daniel Henrique Barboza
<dbarboza@ventanamicro.com> wrote:
>
> We want to add a RISC-V 'virt' libqos machine to increase our test
> coverage. Some of the tests will try to plug a virtio-iommu-pci
> device into the board and do some tests with it.
>
> Enable virtio-iommu-pci in the 'virt' machine.
>
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

Acked-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  hw/riscv/virt.c | 36 +++++++++++++++++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
>
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index b540f4d3da..54ad809b44 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -53,6 +53,7 @@
>  #include "hw/display/ramfb.h"
>  #include "hw/acpi/aml-build.h"
>  #include "qapi/qapi-visit-common.h"
> +#include "hw/virtio/virtio-iommu.h"
>
>  /* KVM AIA only supports APLIC MSI. APLIC Wired is always emulated by QEMU. */
>  static bool virt_use_kvm_aia(RISCVVirtState *s)
> @@ -971,6 +972,34 @@ static void create_fdt_fw_cfg(RISCVVirtState *s, const MemMapEntry *memmap)
>      qemu_fdt_setprop(ms->fdt, nodename, "dma-coherent", NULL, 0);
>  }
>
> +static void create_fdt_virtio_iommu(RISCVVirtState *s, uint16_t bdf)
> +{
> +    const char compat[] = "virtio,pci-iommu\0pci1af4,1057";
> +    void *fdt = MACHINE(s)->fdt;
> +    uint32_t iommu_phandle;
> +    g_autofree char *iommu_node = NULL;
> +    g_autofree char *pci_node = NULL;
> +
> +    pci_node = g_strdup_printf("/soc/pci@%lx",
> +                               (long) virt_memmap[VIRT_PCIE_ECAM].base);
> +    iommu_node = g_strdup_printf("%s/virtio_iommu@%x,%x", pci_node,
> +                                 PCI_SLOT(bdf), PCI_FUNC(bdf));
> +    iommu_phandle = qemu_fdt_alloc_phandle(fdt);
> +
> +    qemu_fdt_add_subnode(fdt, iommu_node);
> +
> +    qemu_fdt_setprop(fdt, iommu_node, "compatible", compat, sizeof(compat));
> +    qemu_fdt_setprop_sized_cells(fdt, iommu_node, "reg",
> +                                 1, bdf << 8, 1, 0, 1, 0,
> +                                 1, 0, 1, 0);
> +    qemu_fdt_setprop_cell(fdt, iommu_node, "#iommu-cells", 1);
> +    qemu_fdt_setprop_cell(fdt, iommu_node, "phandle", iommu_phandle);
> +
> +    qemu_fdt_setprop_cells(fdt, pci_node, "iommu-map",
> +                           0, iommu_phandle, 0, bdf,
> +                           bdf + 1, iommu_phandle, bdf + 1, 0xffff - bdf);
> +}
> +
>  static void finalize_fdt(RISCVVirtState *s)
>  {
>      uint32_t phandle = 1, irq_mmio_phandle = 1, msi_pcie_phandle = 1;
> @@ -1680,7 +1709,8 @@ static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
>  {
>      MachineClass *mc = MACHINE_GET_CLASS(machine);
>
> -    if (device_is_dynamic_sysbus(mc, dev)) {
> +    if (device_is_dynamic_sysbus(mc, dev) ||
> +        object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
>          return HOTPLUG_HANDLER(machine);
>      }
>      return NULL;
> @@ -1699,6 +1729,10 @@ static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
>                                       SYS_BUS_DEVICE(dev));
>          }
>      }
> +
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
> +        create_fdt_virtio_iommu(s, pci_get_bdf(PCI_DEVICE(dev)));
> +    }
>  }
>
>  static void virt_machine_class_init(ObjectClass *oc, void *data)
> --
> 2.43.0
>
>