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Re: [PATCH v2] vga: don't abort when adding a duplicate isa-vga device
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH v2] vga: don't abort when adding a duplicate isa-vga device |
Date: |
Mon, 16 Aug 2021 15:01:03 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 |
On 8/16/21 2:36 PM, Jose R. Ziviani wrote:
> If users try to add an isa-vga device that was already registered,
> still in command line, qemu will crash:
>
> $ qemu-system-mips64el -M pica61 -device isa-vga
> RAMBlock "vga.vram" already registered, abort!
> Aborted (core dumped)
>
> That particular board registers the device automaticaly, so it's
> not obvious that a VGA device already exists. This patch changes
> this behavior by displaying a message and exiting without crashing.
>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/44
> Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
> ---
> hw/display/vga-isa.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/hw/display/vga-isa.c b/hw/display/vga-isa.c
> index 90851e730b..1fba33b22b 100644
> --- a/hw/display/vga-isa.c
> +++ b/hw/display/vga-isa.c
> @@ -33,6 +33,7 @@
> #include "hw/loader.h"
> #include "hw/qdev-properties.h"
> #include "qom/object.h"
> +#include "qapi/error.h"
>
> #define TYPE_ISA_VGA "isa-vga"
> OBJECT_DECLARE_SIMPLE_TYPE(ISAVGAState, ISA_VGA)
> @@ -61,6 +62,15 @@ static void vga_isa_realizefn(DeviceState *dev, Error
> **errp)
> MemoryRegion *vga_io_memory;
> const MemoryRegionPortio *vga_ports, *vbe_ports;
>
> + /*
> + * make sure this device is not being added twice, if so
> + * exit without crashing qemu
> + */
> + if (qemu_ram_block_by_name("vga.vram")) {
> + error_setg(errp, "vga.vram is already registered");
Maybe "'isa-vga' device already registered" is easier to understand?
(vga.vram is about the device model internal).
Otherwise:
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> + return;
> + }
> +
> s->global_vmstate = true;
> vga_common_init(s, OBJECT(dev));
> s->legacy_address_space = isa_address_space(isadev);
>