Re: [Qemu-devel] [PATCH v12 3/4] hw/arm/virt: add dynamic sysbus device support

[Christopher Covington <cov@codeaurora.org>]

Hi Alex,

On 04/27/2015 09:41 AM, Alexander Graf wrote:

>> --- a/hw/arm/virt.c
>> +++ b/hw/arm/virt.c

>> @@ -131,6 +138,7 @@ static const MemMapEntry a15memmap[] = {
>>       [VIRT_FW_CFG] =     { 0x09020000, 0x0000000a },
>>       [VIRT_MMIO] =       { 0x0a000000, 0x00000200 },
>>       /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that
>> size */
>> +    [VIRT_PLATFORM_BUS] =   { 0x0c000000, 0x02000000 },
> 
> Peter, would you have a hard time if we just get rid of VIRT_MMIO completely
> and allow users to create the mmio-virtio bridges using -device for -M
> virt-2.4 and above?
> 
> At the end of the day, I'm fairly sure people will end up virtio-pci anyway
> and it's just a big waste of address space to keep VIRT_MMIO around, no?

I'm not sure I have an opinion one way or the other, but I would like to
understand the "big waste" argument. Is there something that users are eager
to reuse this address space for, like more RAM?

Thanks,
Chris

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