Re: [Xen-devel] [PATCH 12/12] hw/i386/pc: Move PC-machine specific declarations to 'pc_internal.h'

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

On 12/15/19 10:58 AM, Michael S. Tsirkin wrote:
> On Fri, Dec 13, 2019 at 05:47:28PM +0100, Philippe Mathieu-Daudé wrote:
> > On 12/13/19 5:17 PM, Philippe Mathieu-Daudé wrote:
> > > Historically, QEMU started with only one X86 machine: the PC.
> > > The 'hw/i386/pc.h' header was used to store all X86 and PC
> > > declarations. Since we have now multiple machines based on the
> > > X86 architecture, move the PC-specific declarations in a new
> > > header.
> > > We use 'internal' in the name to explicit this header is restricted
> > > to the X86 architecture. Other architecture can not access it.
> > >
> > > Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> > > ---
> > > Maybe name it 'pc_machine.h'?
> > I forgot to describe here (and in the cover), what's follow after this
> > patch.
> >
> > Patch #13 moves PCMachineClass to
> >
> > If you ignore PCMachineState, "hw/i386/pc.h" now only contains 76 lines, and
> > it is easier to see what is PC machine specific, what is X86 specific, and
> > what is device generic (not X86 related at all):
> >
> > - GSI is common to X86 (Paolo sent [3], [6])
> > - IOAPIC is common to X86
> > - i8259 is multiarch (Paolo [2])
> > - PCI_HOST definitions and pc_pci_hole64_start() are X86
> > - pc_machine_is_smm_enabled() is X86 (Paolo sent [5])
> > - hpet
> > - tsc (Paolo sent [3])
> > - 3 more functions
> >
> > So we can move half of this file to "pc_internal.h" and the other to
> >
> > One problem is the Q35 MCH north bridge which directly sets the PCI
> > PCMachineState->bus in q35_host_realize(). This seems a QOM violation and is
> > probably easily fixable.
> >
> > Maybe I can apply Paolo's patches instead of this #12, move X86-generic
> > declarations to "hw/i386/x86.h", and directly git-move what's left of
> > "hw/i386/pc.h" to "pc_internal.h".
> Yea that sounds a bit better.
OK, I'll wait for Paolo's next pull get in, then continue based on that, 
including Paolo's "x86: allow building without PC machine types" series.
(Thanks Paolo for picking most of this series!)


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