Re: [PATCH 05/15] hw/pci-host/q35: Initialize PCI_HOST_BYPASS_IOMMU property from board code

[Igor Mammedov]

On Sun, 11 Jun 2023 12:34:02 +0200
Bernhard Beschow <shentey@gmail.com> wrote:

> The Q35 PCI host already has a PCI_HOST_BYPASS_IOMMU property. However, the
> host initializes this property itself by accessing global machine state,
> thereby assuming it to be a PC machine. Avoid this by having board code
> set this property.
> 
> Signed-off-by: Bernhard Beschow <shentey@gmail.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/i386/pc_q35.c  | 2 ++
>  hw/pci-host/q35.c | 3 +--
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 29b46d3e1c..5220b535b2 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -230,6 +230,8 @@ static void pc_q35_init(MachineState *machine)
>                              x86ms->below_4g_mem_size, NULL);
>      object_property_set_int(phb, PCI_HOST_ABOVE_4G_MEM_SIZE,
>                              x86ms->above_4g_mem_size, NULL);
> +    object_property_set_bool(phb, PCI_HOST_BYPASS_IOMMU,
> +                             pcms->default_bus_bypass_iommu, NULL);
>      sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
>  
>      /* pci */
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index 23b689dba3..7980ddde69 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -66,8 +66,7 @@ static void q35_host_realize(DeviceState *dev, Error **errp)
>                                  s->mch.pci_address_space,
>                                  s->mch.address_space_io,
>                                  0, TYPE_PCIE_BUS);
> -    pci->bypass_iommu =
> -        PC_MACHINE(qdev_get_machine())->default_bus_bypass_iommu;
> +
>      qdev_realize(DEVICE(&s->mch), BUS(pci->bus), &error_fatal);
>  }
>