Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter compatibility

[Paolo Bonzini <pbonzini@redhat.com>]

Il 03/10/2012 12:57, Lucas Meneghel Rodrigues ha scritto:
> Yep, I did send patches with the testdev device present on qemu-kvm.git
> to qemu.git a while ago, but there were many comments on the review, I
> ended up not implementing everything that was asked and the patches were
> archived.
> 
> If nobody wants to step up to port it, I'll re-read the original thread
> and will spin up new patches (and try to go through the end with it).
> Executing the KVM unittests is something that we can't afford to lose,
> so I'd say it's important on this last mile effort to get rid of qemu-kvm.

Absolutely, IIRC the problem was that testdev did a little bit of
everything... let's see what's the functionality of testdev:

- write (port 0xf1), can be replaced in autotest with:
-device isa-debugcon,iobase=0xf1,chardev=...

- exit code (port 0xf4), see this series:
http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg00818.html

- ram size (port 0xd1).  If we can also patch kvm-unittests, the memory
is available in the CMOS or in fwcfg.  Here is the SeaBIOS code:

        u32 rs = ((inb_cmos(0x34) << 16) | (inb_cmos(0x35) << 24));
        if (rs)
            rs += 16 * 1024 * 1024;
        else
            rs = (((inb_cmos(0x30) << 10) | (inb_cmos(0x31) << 18))
                  + 1 * 1024 * 1024);

The rest (ports 0xe0..0xe7, 0x2000..0x2017, MMIO) can be left in testdev.

Paolo