Re: [Qemu-devel] [PATCH V7 4/6] hw/arm/virt: Use the pvpanic device

[Peter Maydell]

On 16 November 2018 at 10:50, Peng Hao <address@hidden> wrote:
>  Add pvpanic device in arm virt machine.
>
> Signed-off-by: Peng Hao <address@hidden>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> ---
>  default-configs/arm-softmmu.mak |  1 +
>  hw/arm/virt.c                   | 21 +++++++++++++++++++++
>  include/hw/arm/virt.h           |  1 +
>  3 files changed, 23 insertions(+)
>
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 2420491..50345df 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -159,3 +159,4 @@ CONFIG_PCI_DESIGNWARE=y
>  CONFIG_STRONGARM=y
>  CONFIG_HIGHBANK=y
>  CONFIG_MUSICPAL=y
> +CONFIG_PVPANIC=y
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 9f67782..c4f29c8 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -59,6 +59,7 @@
>  #include "qapi/visitor.h"
>  #include "standard-headers/linux/input.h"
>  #include "hw/arm/smmuv3.h"
> +#include "hw/misc/pvpanic.h"
>
>  #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
>      static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
> @@ -143,6 +144,7 @@ static const MemMapEntry a15memmap[] = {
>      [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
>      [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
>      [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
> +    [VIRT_PVPANIC] =            { 0x09070000, 0x00000002 },
>      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size 
> */
>      [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> @@ -190,6 +192,23 @@ static bool cpu_type_valid(const char *cpu)
>      return false;
>  }
>
> +static void create_pvpanic_device(const VirtMachineState *vms)
> +{
> +    char *nodename;
> +    hwaddr base = vms->memmap[VIRT_PVPANIC].base;
> +    hwaddr size = vms->memmap[VIRT_PVPANIC].size;
> +
> +    sysbus_create_simple(TYPE_PVPANIC_MMIO, base, NULL);
> +
> +    nodename = g_strdup_printf("/address@hidden" PRIx64, base);
> +    qemu_fdt_add_subnode(vms->fdt, nodename);
> +    qemu_fdt_setprop_string(vms->fdt, nodename,
> +                            "compatible", "qemu,pvpanic-mmio");
> +    qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
> +                                 2, base, 2, size);

Note that we can't take these patches into QEMU until the device
tree binding has been agreed upstream and accepted into the kernel.

> +    g_free(nodename);
> +}
> +
>  static void create_fdt(VirtMachineState *vms)
>  {
>      void *fdt = create_device_tree(&vms->fdt_size);
> @@ -1531,6 +1550,8 @@ static void machvirt_init(MachineState *machine)
>
>      create_flash(vms, sysmem, secure_sysmem ? secure_sysmem : sysmem);
>
> +    create_pvpanic_device(vms);
> +
>      create_gic(vms, pic);

As Shannon suggests, we should not be creating this device by default.

thanks
-- PMM