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

[Kevin Wolf]

[ Cc: qemu-block ]

Am 25.04.2024 um 20:43 hat Thomas Huth geschrieben:
> 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(-)
> 
> -- 
> 2.44.0
> 
>