Re: [PATCH 03/15] hw/pci-host/q35: Initialize PCMachineState::bus in board code

[Igor Mammedov]

On Sun, 11 Jun 2023 12:34:00 +0200
Bernhard Beschow <shentey@gmail.com> wrote:

> The Q35 PCI host currently sets the PC machine's PCI bus attribute
> through global state, thereby assuming the machine to be a PC machine.
> The Q35 machine code already holds on to Q35's pci bus attribute, so can
> easily set its own property while preserving encapsulation.
> 
> Signed-off-by: Bernhard Beschow <shentey@gmail.com>

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

> ---
>  hw/i386/pc_q35.c  | 4 +++-
>  hw/pci-host/q35.c | 1 -
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 62c5d652b7..29b46d3e1c 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -230,10 +230,12 @@ 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);
> +    sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
>  
>      /* pci */
> -    sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
>      host_bus = PCI_BUS(qdev_get_child_bus(DEVICE(phb), "pcie.0"));
> +    pcms->bus = host_bus;
> +
>      /* create ISA bus */
>      lpc = pci_new_multifunction(PCI_DEVFN(ICH9_LPC_DEV, ICH9_LPC_FUNC), true,
>                                  TYPE_ICH9_LPC_DEVICE);
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index 859c197f25..23b689dba3 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -66,7 +66,6 @@ static void q35_host_realize(DeviceState *dev, Error **errp)
>                                  s->mch.pci_address_space,
>                                  s->mch.address_space_io,
>                                  0, TYPE_PCIE_BUS);
> -    PC_MACHINE(qdev_get_machine())->bus = pci->bus;
>      pci->bypass_iommu =
>          PC_MACHINE(qdev_get_machine())->default_bus_bypass_iommu;
>      qdev_realize(DEVICE(&s->mch), BUS(pci->bus), &error_fatal);