Re: [PATCH v2] pseries: allow setting stdout-path even on machines with a VGA

[Daniel Henrique Barboza]

On 5/7/22 02:48, Paolo Bonzini wrote:
> -machine graphics=off is the usual way to tell the firmware or the OS that the
> user wants a serial console.  The pseries machine however does not support
> this, and never adds the stdout-path node to the device tree if a VGA device
> is provided.  This is in addition to the other magic behavior of VGA devices,
> which is to add a keyboard and mouse to the default USB bus.
>
> Split spapr->has_graphics in two variables so that the two behaviors can be
> separated: the USB devices remains the same, but the stdout-path is added
> even with "-device VGA -machine graphics=off".
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---


Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>


And queued in gitlab.com/danielhb/qemu/tree/ppc-next.


Thanks,


Daniel

>   hw/ppc/spapr.c         | 12 ++++++++----
>   include/hw/ppc/spapr.h |  2 +-
>   2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index fe9937e811..75189e4020 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1066,7 +1066,7 @@ static void spapr_dt_chosen(SpaprMachineState *spapr, 
> void *fdt, bool reset)
>               _FDT(fdt_setprop_string(fdt, chosen, "qemu,boot-device", 
> boot_device));
>           }
>   
> -        if (!spapr->has_graphics && stdout_path) {
> +        if (spapr->want_stdout_path && stdout_path) {
>               /*
>                * "linux,stdout-path" and "stdout" properties are
>                * deprecated by linux kernel. New platforms should only
> @@ -2711,6 +2711,7 @@ static void spapr_machine_init(MachineState *machine)
>       const char *kernel_filename = machine->kernel_filename;
>       const char *initrd_filename = machine->initrd_filename;
>       PCIHostState *phb;
> +    bool has_vga;
>       int i;
>       MemoryRegion *sysmem = get_system_memory();
>       long load_limit, fw_size;
> @@ -2949,9 +2950,12 @@ static void spapr_machine_init(MachineState *machine)
>       }
>   
>       /* Graphics */
> -    if (spapr_vga_init(phb->bus, &error_fatal)) {
> -        spapr->has_graphics = true;
> +    has_vga = spapr_vga_init(phb->bus, &error_fatal);
> +    if (has_vga) {
> +        spapr->want_stdout_path = !machine->enable_graphics;
>           machine->usb |= defaults_enabled() && !machine->usb_disabled;
> +    } else {
> +        spapr->want_stdout_path = true;
>       }
>   
>       if (machine->usb) {
> @@ -2961,7 +2965,7 @@ static void spapr_machine_init(MachineState *machine)
>               pci_create_simple(phb->bus, -1, "nec-usb-xhci");
>           }
>   
> -        if (spapr->has_graphics) {
> +        if (has_vga) {
>               USBBus *usb_bus = usb_bus_find(-1);
>   
>               usb_create_simple(usb_bus, "usb-kbd");
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 14b01c3f59..072dda2c72 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -194,7 +194,7 @@ struct SpaprMachineState {
>       Vof *vof;
>       uint64_t rtc_offset; /* Now used only during incoming migration */
>       struct PPCTimebase tb;
> -    bool has_graphics;
> +    bool want_stdout_path;
>       uint32_t vsmt;       /* Virtual SMT mode (KVM's "core stride") */
>   
>       /* Nested HV support (TCG only) */