Re: [PATCH] pci: add romsize property

[Paolo Bonzini <pbonzini@redhat.com>]

On 19/01/21 17:51, Philippe Mathieu-Daudé wrote:
>> +    if (pci_dev->romsize != -1 && !is_power_of_2(pci_dev->romsize)) {
>> +        error_setg(errp, "ROM size %d is not a power of two", pci_dev->romsize);
>> +        return;
>> +    }
> Some cloud providers already complained the pow2 check in the pflash
> device (wasting host storage). Personally I find using pow2 easier
> and safer.

This check only applies to the value that is specified on the command 
line or in a global property, not to the file (the purpose of the 
property is exactly to override the file size, no matter if the file 
size is a power of two or not).

Even if there is no value for the property, non-power-of-two ROMs files 
are accepted and changed into the next power of two:

	pdev->romsize = pow2ceil(size);

> The pow2 check looks like a separate change however, maybe add in a
> separate patch? Or maybe not:)

Not a separate patch for the above reason: the check is on the 
newly-introduced property.

Paolo