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Re: [Qemu-devel] [PATCH v2 06/17] sysbus: add sysbus_pass_mmio

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2 06/17] sysbus: add sysbus_pass_mmio
Date: Tue, 4 Jun 2013 13:36:42 +0100

On 4 June 2013 13:31, Paolo Bonzini <address@hidden> wrote:
> Il 04/06/2013 14:24, Peter Maydell ha scritto:
>> On 4 June 2013 13:13, Paolo Bonzini <address@hidden> wrote:
>> This is much less flexible than just using sysbus_mmio_get_region(),
>> because it only lets you pass the whole set of MMIOs from the
>> other device through, not just the ones you want.
> How is this different from sysbus_pass_irq?

sysbus_pass_irq is also an annoyingly inflexible function.
With MMIOs we have the advantage of being able to do better.

>> Please just make reference counting work properly with passing
>> MemoryRegion*s around.
> Do you have any idea that doesn't require touch 800 invocation of the
> region creation functions?

I think that would be a straightforward and easy to understand
way to define the ownership rules so I would much rather we
did that. I really don't like the way your current patch
is doing something complicated in an attempt to avoid this.

-- PMM

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