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Re: [Qemu-trivial] [Qemu-devel] [PATCH v3] hw/i386/pc: prompt not multbo


From: li guang
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH v3] hw/i386/pc: prompt not multboot or morden kernel image
Date: Tue, 09 Apr 2013 13:05:00 +0800

在 2013-04-08一的 23:36 -0500,Jesse Larrew写道:
> On 04/08/2013 09:27 PM, liguang wrote:
> > if head magic is missing or wrong unexpectedly, we'd
> > better to prompt memssage for this.
> > e.g.
> > I make a mistake to boot a vmlinuz for MIPS(which
> > I think it's for x86) like this:
> > qemu-system-x86_64 -kernel vmlinuz -initrd demord
> > then qemu report:
> > "qemu: linux kernel too old to load a ram disk"
> > that's misleading.
> > 
> 
> Yes, that message would definitely be misleading in this case.
> 
> > Signed-off-by: liguang <address@hidden>
> > ---
> >  hw/i386/pc.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> > index ebbf059..6b29c3f 100644
> > --- a/hw/i386/pc.c
> > +++ b/hw/i386/pc.c
> > @@ -686,6 +686,8 @@ static void load_linux(void *fw_cfg,
> >          if (load_multiboot(fw_cfg, f, kernel_filename, initrd_filename,
> >                             kernel_cmdline, kernel_size, header)) {
> >              return;
> > +        } else {
> > +            fprintf(stderr, "warn: invalid multiboot or modern kernel 
> > image\n");
> >          }
> >          protocol = 0;
> >      }
> > 
> 
> My impression from reading through the code is that this branch can be
> legitimately triggered by an older kernel (protocol < 0x200). 

right.

> In that case,the error message above would also be misleading.

the warning message is saying: hey, we prefer modern kernel image
or multiboot, but you specify neither, what are you doing?
do you want to boot an old(obsolete) kernel?

or, add a line like fprintf(stderr, "do you boot an old kernel?\n") :-)

> 
> I think a better solution might be to simply validate that the arch
> specified in the ELF header matches the arch that qemu is emulating.
>  I'll look into this more tomorrow morning. :)

that's fine

> 
> Jesse Larrew
> Software Engineer, KVM Team
> IBM Linux Technology Center
> Phone: (512) 973-2052 (T/L: 363-2052)
> address@hidden
> 





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