Re: [Qemu-devel] [PATCH 0/3] multiboot: Fix memory information

[Anthony Liguori <aliguori@us.ibm.com>]

Kevin Wolf <kwolf@redhat.com> writes:

> Am 23.06.2013 um 23:39 hat Anthony Liguori geschrieben:
>> Kevin Wolf <mail@kevin-wolf.de> writes:
>> 
>> > Kevin Wolf (3):
>> >   multiboot: Don't forget last mmap entry
>> >   multiboot: Calculate upper_mem in the ROM
>> >   multiboot: Updated ROM binary
>> 
>> Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
>> 
>> Do you have a test case that triggered this that you can share?
>
> I haven't seen an actual kernel failure myself, this was reported by
> someone else. But it's easy enough to check with a simple Multiboot
> kernel that just outputs lower_mem/upper_mem and the mmap.
>
> For debugging and fixing I added some throw-away debug code to an
> existing kernel and compared the fixed version with the output when
> loaded by GRUB and it matches now.
>
> If we can have a real test case for this somewhere, I can write a small
> kernel to do the check. Not sure where it would fit though - probably
> kvm-unittests is the closest, even though the test wouldn't really have
> anything to do with KVM.

We could put it in pc-bios even with just a README for now.  Would be
nice to figure out ways to test -kernel as we do find issues often
enough.

It's up to you.  If you had something handy, I was going to add it to my
local test setup.

Regards,

Anthony Liguori

>
>> I'll apply this after a day or so when others have had a chance to review.
>
> Sounds good, thanks.
>
> Kevin