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Re: [Qemu-devel] [PATCH 3/3] support readonly memory feature in qemu


From: Kevin O'Connor
Subject: Re: [Qemu-devel] [PATCH 3/3] support readonly memory feature in qemu
Date: Tue, 11 Sep 2012 20:01:20 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, Sep 11, 2012 at 11:15:50AM -0500, Anthony Liguori wrote:
> Jan Kiszka <address@hidden> writes:
> > On 2012-09-11 05:02, Kevin O'Connor wrote:
> >> The easiest way to fix this is to change QEMU to boot with the area
> >> read-write.  There's no real gain in booting with the memory read-only
> >> as the first thing SeaBIOS does is make it read-write.
> >
> > Considering SeaBIOS, that is true. If Seabios depends inherently on
> > shadow ROMs and as we have no real chipset for isapc to control
> > shadowing behavior, that will likely be the best option. Can have a
> > look.
> 
> I've never really understood this.
> 
> Why do we need ISAPC?  An ISA-only OS would still be okay on a system
> with an i440fx and no PCI devices, no?
> 
> I think that makes a lot more sense because then SeaBIOS doesn't have to
> deal with the notion of ISAPC.

Regardless of whether or not there is a need to support an isapc
machine, I think it would still be preferable to boot with the
0xc0000-0x100000 memory in read-write mode.  The SeaBIOS code to make
that memory read-write without being able to modify any of that ram is
awkward.

-Kevin



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