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Re: [Qemu-devel] [Question] memory: AddressSpace backed by single IO Mem
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [Question] memory: AddressSpace backed by single IO MemoryRegion |
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Date: |
Wed, 18 Sep 2013 17:43:36 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 |
Il 17/09/2013 10:29, Peter Maydell ha scritto:
> On 16 September 2013 18:18, Paolo Bonzini <address@hidden> wrote:
>> Il 16/09/2013 19:11, Marcel Apfelbaum ha scritto:
>>>>> memory_region_init_io(my_reg, owner, my_ops, my_obj, "my region",
>>>>> INT64_MAX);
>>
>> This is 2^63-1, not 2^64-1. You need UINT64_MAX here.
>
> So does this mean address_space_init()'s base memory
> region has to be 2^64-1 (could we assert that?) or should
> this have worked anyway?
No, it probably means that it must be page-aligned.
It should have worked anyway, but I'm not 100% sure without looking more
at the code. It's a somewhat obscure corner case.
Paolo