Re: MemoryRegionOps callback sizes

[Philippe Mathieu-Daudé]

Hello,

On 4/6/20 5:49 PM, hgedek wrote:
> Hello,
>
> Im new to qemu and trying to update a project that developed before me ! 
> I have a question, thanks for help.
>
> Memory allocation is done using MMIO and its created 64 bits bars for 
> it. And while accessing pages I wish to see 8 bytes at read / write 
> callbacks but 4 bytes are used.
>
> I wish to learn how to edit this ? How can we set MMIO will use 64 bits 
> = not 32 bits ?

Is your guest using 64-bit accesses?

If the device only allow 64-bit, it should have:

static const MemoryRegionOps ops = {
    .valid.min_access_size = 8,
    .valid.max_access_size = 8,
    ...
};

> ( I hope I can explain = sorry )
>
> Thanks