Re: [Qemu-devel] [PATCH QEMU v1 0/4] multiboot: bss_end_addr can be zero / cleanup

[Kevin Wolf <kwolf@redhat.com>]

Am 02.03.2018 um 20:32 hat Jack Schwartz geschrieben:
> Hi Kevin.
> 
> On 2018-01-15 07:54, Kevin Wolf wrote:
> > Am 21.12.2017 um 18:25 hat Jack Schwartz geschrieben:
> > > Properly account for the possibility of multiboot kernels with a zero
> > > bss_end_addr.  The Multiboot Specification, section 3.1.3 allows for
> > > kernels without a bss section, by allowing a zeroed bss_end_addr multiboot
> > > header field.
> > > 
> > > Do some cleanup to multiboot.c as well:
> > > - Remove some unused variables.
> > > - Use more intuitive header names when displaying fields in messages.
> > > - Change fprintf(stderr...) to error_report
> > There are some conflicts with Anatol's (CCed) multiboot series:
> > https://lists.nongnu.org/archive/html/qemu-devel/2017-10/msg03003.html
> > 
> > None if these should be hard to resolve, but it would be good if you
> > could agree with each other whose patch series should come first, and
> > then the other one should be rebased on top of that.
> > 
> > > Testing:
> > >    1) Ran the "make check" test suite.
> > >    2) Booted multiboot kernel with bss_end_addr=0.  (I rolled my own
> > >       grub multiboot.elf test "kernel" by modifying source.)  Verified
> > >       with gdb that new code that reads addresses/offsets from multiboot
> > >       header was accessed.
> > >    3) Booted multiboot kernel with non-zero bss_end_addr.
> > >    4) Uncommented DEBUG_MULTIBOOT in multiboot.c and verified messages worked.
> > >    5) Code has soaked in an internal repo for two months.
> > Can you integrate your test kernel from 2) in tests/multiboot/ so we can
> > keep this as a regression test?
> If need be, would you be willing to accept updated versions of these patches
> (with another review, of course) without the test file?  I will deliver the
> test file later once I get company approvals.  I don't want the test file to
> continue holding everything up in the meantime.

Sure, let's move forward with what we have now. Please keep me CCed when
you send a new version and I'll give it a review and hopeuflly get it
merged.

Kevin