Re: [Qemu-devel] [PATCH v3] hw/arm/virt: Add high MMIO PCI region

[Peter Maydell]

On 29 July 2015 at 10:45, Pavel Fedin <address@hidden> wrote:
>> > because i discovered problems with 32-bit guests. They simply truncate
>> > high word and end up in attempt to put PCI at 0x00000000 - 0xFFFFFFFF, 
>> > fail,
>> > and do not work of course. So, my next version will have high MMIO
>> > only for 64-bit guests.
>>
>> That sounds like a guest bug to me. If the device tree says that
>> addresses are two-cells wide then the code reading it ought to
>> read both cells, not just ignore the top 32 bits...
>
>  May be. It's old kernel, v3.19, but still it works as it works.

It matters because you can run 32 bit guests in 64-bit-capable
CPUs. I don't really want to have two different address layouts
just to work around a kernel bug if we could fix the kernel
bug instead...

-- PMM