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Date: Thu, 28 Mar 2013 10:42:37 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130328094237.GE24910@stefanha-thinkpad.redhat.com>
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Subject: Re: [Qemu-devel] [Qemu-trivial] [PATCH] hw/i386/pc: reject to boot
 a wrong header magic kernel
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To: liguang <lig.fnst@cn.fujitsu.com>
Cc: qemu-trivial@nongnu.org, qemu-devel@nongnu.org

On Wed, Mar 27, 2013 at 02:10:31PM +0800, liguang wrote:
> if head magic is missing or wrong unexpectedly, we'd
> better to reject booting.
> 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.
> 
> Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
> ---
>  hw/i386/pc.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index b1e06fa..2b78dfc 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -683,8 +683,10 @@ 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, "please assure specicified kernel is for x86!\n");
> +            exit(1);

load_multiboot() can fail for other reasons so this error messing is
misleading.  Giving QEMU a non-x86 kernel is just one scenario where
this may fail.

>          }
> -        protocol = 0;
>      }

Why did you drop protocol = 0?

Stefan