Re: [Qemu-devel] [PATCH 7/8] machine: query dump-guest-core machine property rather than qemu opts

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

On 02/04/2015 05:43 PM, Marcel Apfelbaum wrote:
> Fixes a QEMU crash when passing dump_guest_core parameter in command line.
>
> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Please amend commit message:

Running
     qemu-bin ... -machine pc,dump-guest-core=on
leads to crash:
     x86_64-softmmu/qemu-system-x86_64 -machine pc,dump-guest-core=on
     qemu-system-x86_64: qemu/util/qemu-option.c:387: qemu_opt_get_bool_helper: Assertion `opt->desc && opt->desc->type == QEMU_OPT_BOOL' failed.
     Aborted (core dumped)

This happens because the commit e79d5a6 ("machine: remove qemu_machine_opts global list")
removed the global option descriptions and moved them to MachineState's QOM properties.

Fix this by querying machine properties through designated wrappers.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>



> ---
>   exec.c              | 4 ++--
>   hw/core/machine.c   | 6 ++++++
>   include/hw/boards.h | 1 +
>   3 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/exec.c b/exec.c
> index 6b79ad1..bfca528 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -26,6 +26,7 @@
>   #include "cpu.h"
>   #include "tcg.h"
>   #include "hw/hw.h"
> +#include "hw/boards.h"
>   #include "hw/qdev.h"
>   #include "qemu/osdep.h"
>   #include "sysemu/kvm.h"
> @@ -1213,8 +1214,7 @@ static void qemu_ram_setup_dump(void *addr, ram_addr_t size)
>       int ret;
>
>       /* Use MADV_DONTDUMP, if user doesn't want the guest memory in the core */
> -    if (!qemu_opt_get_bool(qemu_get_machine_opts(),
> -                           "dump-guest-core", true)) {
> +    if (!machine_dump_guest_core(current_machine)) {
>           ret = qemu_madvise(addr, size, QEMU_MADV_DONTDUMP);
>           if (ret) {
>               perror("qemu_madvise");
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index 5ad2409..8033683 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -285,6 +285,7 @@ static void machine_initfn(Object *obj)
>
>       ms->kernel_irqchip_allowed = true;
>       ms->kvm_shadow_mem = -1;
> +    ms->dump_guest_core = true;
>
>       object_property_add_str(obj, "accel",
>                               machine_get_accel, machine_set_accel, NULL);
> @@ -425,6 +426,11 @@ int machine_phandle_start(MachineState *machine)
>       return machine->phandle_start;
>   }
>
> +bool machine_dump_guest_core(MachineState *machine)
> +{
> +    return machine->dump_guest_core;
> +}
> +
>   static const TypeInfo machine_info = {
>       .name = TYPE_MACHINE,
>       .parent = TYPE_OBJECT,
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index 1f21bdf..7de308e 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -71,6 +71,7 @@ bool machine_kernel_irqchip_allowed(MachineState *machine);
>   bool machine_kernel_irqchip_required(MachineState *machine);
>   int machine_kvm_shadow_mem(MachineState *machine);
>   int machine_phandle_start(MachineState *machine);
> +bool machine_dump_guest_core(MachineState *machine);
>
>   /**
>    * MachineClass:
>