[PATCH 0/3] Make it possible to compile the x86 binaries without FDC

[Thomas Huth]

For downstream versions of QEMU, we'd like to be able to compile QEMU
without the FDC code included (since it's not required for modern VMs
anymore and the FDC code has rather a bad reputation, see the VENOM CVE).

The q35 machine can already be instantiated without FDC, but for being
able to link a binary without the FDC code, the Kconfig file needs some
tweaks and there are two spots in the pc code that directly call functions
from the FDC code - those need to be disabled via #ifdefs.

The third patch changes the i440fx and isapc machine types so that
they can work without the FDC device, too, in case it has not been
compiled into the binary. It's marked as RFC since I assume that the
FDC was originally a fix compononent of these motherboards, so I'm
unsure whether we should allow the disablement there. OTOH, it seems
to work fine, and the FDC is only disabled when it is not available
in the binary, so I hope this patch is fine, too.

Thomas Huth (3):
  hw/i386/pc: Allow to compile without CONFIG_FDC_ISA
  hw/i386/Kconfig: Allow to compile Q35 without FDC_ISA
  hw/i386: Add the possibility to use i440fx and isapc without FDC

 hw/i386/pc.c      | 13 +++++++++----
 hw/i386/pc_piix.c |  6 ++++--
 hw/i386/Kconfig   |  2 +-
 3 files changed, 14 insertions(+), 7 deletions(-)

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2.44.0