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

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Mar 10, 2015 at 06:50:24PM +0100, Andreas Färber wrote:
> Hi,
> 
> Am 04.02.2015 um 16:43 schrieb Marcel Apfelbaum:
> > Fixes a QEMU crash when passing dump_guest_core parameter in command line.
> 
> Explain that, please?

Pls note the submission date.  It's 1 month late to ask for
basic clarifications.

I've merged the patches, I'll fix up issues such as prettifying
includes by adding patches on top.



> > 
> > 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)) {
> 
> linux-user doesn't have a current_machine, and machine.c shouldn't even
> be compiled in, so I'm guessing this function is #ifdef'ed, which means
> the header should be #ifdef'ed, too. hw/boards.h has no business being
> in *-user.
> 
> Regards,
> Andreas
> 
> >          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:
> > 
> 
> 
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